Início » Ciência » Webinars » Apresentações » 2018
22/11 - 12:00 pm
Martin Eriksen
Abstract ⓘ
Abstract
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Martin Eriksen
Title
The PAU Survey: Early demonstration of photometric redshift performance in the COSMOS field (IFAE-PIC)
Abstract
The PAU Survey (PAUS) is an innovative photometric survey with 40 narrow bands at the William Herschel Telescope (WHT). The narrow bands are spaced at 100 ansgstron intervals covering the range 4500to 8500 angstron and, in combination with standard broad bands, enable excellent redshift precision. This talk discuss the technique, galaxy templates and additional photometric calibration used to determine early photometric redshifts from PAUS. Using BCNZ2, a new photometric redshift code developed for this purpose, we characterise the photometric redshift performance using PAUS data on the COSMOS field. Comparison to secure spectra from zCOSMOS DR3 shows that PAUS achieves σ68/(1+z) = 0.0037 to iAB < 22.5 when selecting the best 50% of the sources based on a photometric redshift quality cut. Furthermore, a higher photo-z precision (σ68 /(1+z) ~ 0.001) is obtained for a bright and high quality selection, which is driven by the identification of emission lines. We conclude that PAUS meets its design goals, opening up a hitherto uncharted regime of deep, wide, and dense galaxy survey with precise redshifts that will provide unique insights into the formation, evolution and clustering of galaxies, as well as their intrinsic alignments.
08/11 - 02:00 pm
Jordan Raddick
Abstract ⓘ
Abstract
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Jordan Raddick
Title
Title: A new universe of online data (The Johns Hopkins University)
Abstract
SciServer (www.sciserver.org) is an online system for scientific research and education with big data. The system offers access to several Petabyte-scale scientific datasets in fields ranging from astronomy to turbulence to genomics, along with a set of simple but powerful browser-based tools to visualize and analyze those datasets. The power of SciServer lies in its close connection to datasets like the Sloan Digital Sky Survey (SDSS), allowing for simple, fast analysis with minimal setup. The SciServer Dashboard offers quick access to all SciServer tools and datasets, and to all prior work within the system. All users up to 10 GB of file and database storage space – and through the Dashboard, users can manage uploaded data files, and can create collaborative groups to share datasets and scripts publicly or with selected colleagues. SciServer makes it easy to share exactly the right data with exactly the right people. SciServer’s Compute tool enables online computational analysis of big data through Jupyter notebooks. With only a few clicks, a user can create a customized environment on fast, high-memory virtual machines hosted by IDIES, where they can write or upload Python, R, or Matlab scripts to perform all sorts of data-intensive tasks. Importantly, SciServer allows these scripts to be run in either interactive or batch mode, meaning that even the most demanding data-intensive analyses can be completed with ease. To help scale up research quickly, SciServer Compute features a wealth of “getting started” data files and example notebooks that can be adapted to meet researchers’ needs. In addition to SciServer’s obvious potential for data-intensive science and engineering research, the system has been used effectively in many educational settings, particularly as data-intensive lab activities for undergraduate science courses. Learners get immediate access to high-performance computing resources without the need to install and configure software. A new set of “SciServer Courseware” notebooks creates an environment to manage learning activities by creating shareable user volumes and groups so that students and TAs can access files with appropriate permissions. SciServer is funded by National Science Foundation award ACI-1261715. For more information, please visit www.sciserver.org or contact the SciServer Helpdesk at sciserver-helpdesk@jhu.edu
Slides not available
25/10 - 01:00 pm
Keith Bechtol
Abstract ⓘ
Abstract
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Keith Bechtol
Title
LSST Commissioning Science Verification and Validation (LSST)
Abstract
As the integrated Large Synoptic Survey Telescope (LSST) system comes together during commissioning, we need to understand the degree to which the camera, telescope, and data management system are functioning together in a way that will support the high-level scientific goals of the 10-year survey. Accordingly, a major goal of commissioning is to quantify the distribution of performance of the as-built LSST system using a combination of on-sky data, informed simulations, and external datasets. These studies can then be used to inform early operations. I will describe the systems engineering approach adopted by the LSST Project for verification, validation, and characterization, and discuss the current status and plans for sustained data-taking and analysis campaigns during commissioning.
11/10 - 11:00 am
Celso Mendes
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Abstract
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Celso Mendes
Title
Current trends in High-Performance Computing (INPE)
Abstract
High-Performance Computing (HPC) is an area where numerous exciting advances have been observed recently. Besides their concrete economic impact to society in general, those advances have truly improved the rate of scientific discoveries. In fact, the use of high-performance machines for simulations has become prevalent in most developments in science and engineering today. In this talk, we will briefly describe the status of existing HPC systems, in Brazil and abroad, pointing to the technological factors that enabled this scenario, including Moore’s Law and multi-core processors. We will then present the major paradigms that are presently used to program these systems, and examples of large scientific applications that have been developed under some of these paradigms. Finally, we will close with a personal view of current trends and challenges that the HPC community will face in the near future, and potential directions for further progress.
26/09 - 01:45 pm
Amanda Bauer
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Abstract
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Amanda Bauer
Title
LSST Education and Public Outreach (EPO) (LSST)
Abstract
The Large Synoptic Survey Telescope (LSST) will conduct a 10-year wide, fast, and deep survey of the night sky, and will have a unique EPO program that will go live when the telescope starts operating in late 2022. EPO will enable public access to a subset of LSST data so anyone can explore the universe and be part of the discovery process. In this talk I will describe some major components of the EPO program, including online notebooks that will enable educators to provide LSST data in their classrooms without needing to download and maintain software or data files, an interactive Skyviewer, original multimedia for informal science centers and planetariums, and citizen science projects that use LSST data.
26/09 - 01:00 pm
Ranpal Gill
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Ranpal Gill
Title
LSST Communications Office - A small but productive team (LSST )
Abstract
In this presentation we will explain the mission of the Communication Office and how this influences what we do. We will provide details and examples of the tasks we carry out, how we coordinate, collaborate and communicate with partners SLAC, NCSA & IN2P3 and with our community. Branding and what it means to use the LSST name and brand will also be covered. It is the intention that attendees will gain insight into how the Communications Office functions leading to potential future collaboration to benefit the community as a whole.
25/09 - 01:30 pm
William O\\\'Mullane
Abstract ⓘ
Abstract
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William O\\\'Mullane
Title
LSST Data Management Overview and Status (LSST)
Abstract
In this talk a brief update on the status of LSST in general as well as DM specifically will be given. We shall go into some details on the structure and organisation of Data Management.
20/09 - 02:00 pm
Victor Krabbendam
Abstract ⓘ
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Victor Krabbendam
Title
LSST Project Status: The System is becoming Real (LSST)
Abstract
LSST started construction in 2014 after a decade of consideration, design and early development.There has been tremendous progress in the last 4 years to make the full LSST system a reality. This talk will review the challenging objectives of the LSST and the current progress and achievements across the Project. LSST remains on schedule to begin the wide, fast, deep optical survey of the visible sky starting in October 2022.
13/09 - 11:00 am
Marko Simonovic
Abstract ⓘ
Abstract
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Marko Simonovic
Title
Analytical Tools for Future LSS Surveys (CERN)
Abstract
Abstract: I will briefly review the perturbation theory approach to clustering of matter and galaxies and show how well the theoretical predictions match the simulations. I will particularly focus on the so called IR resummation and predictions for the shape of the BAO peak. I will also discuss the limitations of perturbative calculations and how the theoretical uncertainties impact the inference of cosmological parameters in galaxy surveys. Finally, I will mention some of the open questions in analytical modelling of LSS and strategies to resolve them.
13/09 - 03:30 pm
William Hartley
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William Hartley
Title
Multi-messenger astronomy with DECam and LIGO / VIRGO (University College London)
Abstract
Slides not available
06/09 - 10:00 am
Ian Shipsey
Abstract ⓘ
Abstract
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Ian Shipsey
Title
The Large Synoptic Survey Telescope Corporation (LSSTC) (University of Oxford)
Abstract
The Large Synoptic Survey Telescope (LSST) is the most ambitious all sky survey of the universe ever proposed. In just its first month of operation LSST will see more of the universe at optical wavelengths than all previous telescopes built by mankind. LSST will conduct a 10-year survey of the sky that will deliver a 200 petabyte set of images and data products that will address some of the most pressing questions about the structure and evolution of the universe and the objects within it: Dark Matter and Dark Energy, Hazardous Asteroids and the Remote Solar System, The Transient Optical Sky and The Formation and Structure of the Milky Way. The LSST Corporation (LSSTC) was formed to initiate the LSST Project and advance astronomy and physics. LSSTC represents nearly 40 US & Chilean institutional members, as well as 74 international institutions representing 23 countries and over 1500 scientists and researchers. LSSTC partners with NSF/AURA and DOE/SLAC in LSST operations and will enable the exploitation of LSST’s data by advocating for and supporting LSST science. I will talk about being part of LSST, LSSTC as an academic at an university in UK, a country that is neither a main funder or the host nation.
Slides not available
30/08 - 11:00 am
Marcel Schmittfull
Abstract ⓘ
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Marcel Schmittfull
Title
Prospects for CMB lensing-galaxy clustering cross-correlations and initial condition reconstruction (Institute for Advanced Study, Princeton)
Abstract
The lensing convergence measurable with future CMB experiments will be highly correlated with the clustering of galaxies that will be observed by imaging surveys such as LSST. I will discuss prospects for using that cross-correlation signal to constrain local primordial non-Gaussianity, the amplitude of matter fluctuations as a function of redshift, halo bias, and possibly the sum of neutrino masses. A key limitation for such analyses and large-scale structure analyses in general is that the mapping from initial conditions to observables is nonlinear for wavenumbers k>0.1h/Mpc. This can destroy cosmological information or move it to non-Gaussian tails of the probability distribution that are difficult to measure. I will describe how we can use recently developed initial condition reconstruction methods to help us recover some of that information in the nonlinear regime.
23/08 - 11:00 am
Ezequiel Treister
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Abstract
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Ezequiel Treister
Title
Chilean Participation in LSST (Pontificia Universidad Catolica de Chile)
Abstract
In this informal talk I will give a brief overview of the LSST project and present an update of the status of its construction. I will then describe the Chilean participation on LSST and our involvement in the different scientific collaborations, with some focus on the AGN Science Collaboration, of which I am a member. Finally, I will present the current data rights and data access plan and how can it impact international contributors, leaving time for questions and comments.
16/08 - 11:00 am
Seth Siegel
Abstract ⓘ
Abstract
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Seth Siegel
Title
Status of CHIME: The Canadian Hydrogen Intensity Mapping Experiment (McGill University)
Abstract
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a new radio interferometer located at the Dominion Radio Astrophysical Observatory (DRAO) near Penticton, British Columbia. Every day CHIME maps the entire northern half of the sky at radio frequencies between 400-800 MHz with a synthesized beam resolution of 20-40 arcminutes. Over the next 5 years, CHIME will produce a three-dimensional intensity map of the 21 cm radiation from neutral hydrogen over a 600 cubic Gpc volume. This will enable a measurement of the scale of the Baryon Acoustic Oscillations (BAO) in both the angular and line-of-sight direction across the redshift range z=0.8-2.5. This in turn will provide precise constraints on the angular diameter distance and expansion rate during the epoch when dark energy generated the transition from decelerated to accelerated expansion of the Universe. CHIME began collecting science data in March 2018. In this talk I will lead you on a virtual tour of the experiment. I\\\\\\\'ll provide an update on its current status and a first look at the data that it has collected. The primary challenge facing CHIME is the removal of astrophysical foregrounds that are several orders of magnitudes brighter than the cosmological 21 cm signal of interest. Our ability to remove these foregrounds depends on characterizing the instrument at an unprecedented level. I\\\\\\\'ll discuss the calibration strategies that are being pursued to measure our antenna beam patterns and time varying receiver gains with the required precision. Assuming that we are able to meet the foreground challenge, I\\\\\\\'ll conclude with a forecast on the cosmological constraints that we expect to place.
09/08 - 11:00 am
Rafael Santos
Abstract ⓘ
Abstract
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Rafael Santos
Title
You\\\'re already a Data Scientist, now go ask for a raise (INPE)
Abstract
There has been a lot of hype around Data Science -- online academic and technical courses, videos, books, blogs, job opportunities, etc. It seems that Data Science is the dream job of the (very near) future, and there are huge opportunities and salaries for data scientists. In this talk I will present different views of what Data Science is and what is expected from a data scientist, trying to filter out the hype. While there is a need for professionals specialized in extracting knowledge from data, we will see that most of the knowledge required to be a data scientist is already being employed by researchers in areas like astronomy, bioinformatics, remote sensing, banking, etc.: in these cases Data Science is more useful as an organizational approach for data-based experiments. This is a non-technical talk, and is the first lecture in a graduate-level course on Data Science at INPE, the Brazilian National Institute for Space Research.
02/08 - 11:00 am
Katrin Heitmann
Abstract ⓘ
Abstract
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Katrin Heitmann
Title
Cosmological Simulations for Large-Scale Sky Surveys and the LSST DESC Data Challenge 2 (Argonne National Laboratory)
Abstract
Cosmology -- the study of the origin, evolution, and constituents of the Universe -- is now entering one of its most scientifically exciting phases. Three decades of surveying the sky have culminated in the celebrated \\\"Cosmological Standard Model\\\". Yet, two of its key pillars, dark matter and dark energy -- together accounting for 95% of the mass-energy of the Universe -- remain mysterious. Next-generation observatories will open new routes to understand the true nature of the \\\"Dark Universe\\\". These observations will pose tremendous challenges on many fronts -- from the sheer size of the data that will be collected (more than a hundred Petabytes) to its modeling and interpretation. The interpretation of the data requires sophisticated simulations on the world\\\'s largest supercomputers. The cost of these simulations, the uncertainties in our modeling abilities, and the fact that we have only one Universe that we can observe opposed to carrying out controlled experiments, all come together to create a major test for our future data analysis capabilities. In this talk I will discuss an ambitious end-to-end simulation project that attempts to provide a faithful view of the Universe as seen through the Large Synoptic Survey Telescope (LSST). This simulation project is the foundation for the second data challenge (DC2) carried out by the LSST Dark Energy Science Collaboration (LSST DESC). I will briefly describe how these complex, large-scale simulations will be used in order to prepare the collaboration for the arrival of LSST data.
12/07 - 02:00 pm
Gregory Dubois
Abstract ⓘ
Abstract
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Gregory Dubois
Title
The LSST Science Platform - Delivering Data, Supporting Analysis (Caltech)
Abstract
The LSST Science Platform is the set of interfaces that will be provided to the LSST data, user storage, and user computing. The presentation will cover the three “Aspects” of the Science Platform: the data access APIs, providing IVOA-standard and other interfaces to the LSST catalog and image data; the Portal Aspect, providing a Web interface for discovering, querying, and visualizing LSST data products and user data; and the Notebook Aspect, providing a JupyterLab environment for user-driven data access and analysis in Python. I will describe and demonstrate the features already present in the current prototypes and the capabilities still planned for future development.
Slides not available
05/07 - 11:00 am
Matias Carrasco
Abstract ⓘ
Abstract
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Matias Carrasco
Title
Astronomical Data Access in the Era of Scientific Cloud Computing (University of Illinois)
Abstract
Data Access is such a simple term to understand but can hide many layers of complex systems and ideas thus it can be unequivocally be interpreted and explained in many different ways in regards software, technology, abstraction or design. This is also true in the context of astronomical data, both literally and figuratively. In this talk I will discuss a personal view on what data access means for astronomical surveys and how we can improve it, on how scientific cloud computing is rapidly evolving and being adopted and on how the revolution current open source technologies like containers, Jupyter and micro services are changing the way we understand and do Astronomy.
07/06 - 02:00 pm
Andrew Connolly
Abstract ⓘ
Abstract
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Andrew Connolly
Title
The Rise of the Machines in Astronomy (University of Washington)
Abstract
Machine learning has become integral to the analysis of astronomical data over the last decade. It has aided in a number of ground breaking results; from the identification of early onset supernovae to the efficient selection of QSOs from large survey data sets. In this talk I will describe some of the developments in machine-learning applications that impacted astronomical discoveries, describe why some techniques that, at first, appeared superior to existing applications did not gain traction in the astronomical community, and look at emerging methodologies that may impact astronomical surveys such as the Large Synoptic Survey Telescope
29/05 - 11:00 am
Jennifer Johnson
Abstract ⓘ
Abstract
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Jennifer Johnson
Title
Better Stellar Ages Through Chemistry (Ohio State University)
Abstract
Reliable stellar ages hold the key to numerous questions of galaxy and stellar system formation. However, they have been frustratingly hard to measure for field stars. While Gaia will improve the situation markedly for nearby turnoff stars, determination of ages for giants will not benefit to the same degree. In this talk, I will discuss the calibration of chemical ages, based on [C/N], which tags the mass of the star, and [alpha/Fe], which tags the time since star formation began. I will use these ages to discuss outstanding problems in the Galaxy, including the amount of radial mixing through the disk, the prevalence of stellar mergers, and the inside-out formation of the Galaxy. I will also preview the Milky Way Mapper, part of SDSS-V that will provide an unprecedented view of the stellar populations of the Galaxy.
24/05 - 03:00 pm
Scott Anderson
Abstract ⓘ
Abstract
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Scott Anderson
Title
The Black Hole Mapper in SDSS-V (University of Washington)
Abstract
The Black Hole Mapper is among the main science programs of the next generation Sloan Digital Sky Survey (SDSS-V), actively being developed for dual-hemisphere, wide-area, multi-epoch and multi-object spectroscopy (MOS), starting 2020. Black Hole Mapper (BHM) exploits two hallmark characteristics of accreting supermassive black holes (SMBHs) in quasars to assess their fundamental parameters, astrophysics, and evolution: optical spectral variability on a range of timescales from days to decades, and prodigious luminosities extending even up to X-ray energies. In the time-domain, tens of thousands of quasars will be (re)observed with MOS at a range of cadences, with the bulk having a few to a dozen epochs added in SDSS-V, e.g., suitable for exploring accretion astrophysics and transitions such as changing look quasars; and BHM time-domain efforts will more-intensively study >1000 quasars, each with hundreds of spectral epochs for reverberation measures of masses of SMBHs across a broad range of redshift and luminosity. BHM additionally will reveal the identifications and natures (redshift, spectral subclass etc.) of the optical counterparts to hundreds of thousands of X-ray sources (mainly AGN) discovered in initial years of the upcoming eROSITA surveys of the X-ray sky; the eROSITA/SDSS-V combination will yield an obscuration unbiased probe of SMBH demographics and evolution, again with orders of magnitude advances. [BHM optical IDs of eROSITA sources will also yield X-ray emitting clusters of galaxies, compact binaries and CVs, and active late-type stars]. An overview is provided of the status of BHM planning, as we continue to expand our international collaboration.
17/05 - 12:00 pm
Niv Drory
Abstract ⓘ
Abstract
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Niv Drory
Title
The Local Volume Mapper in SDSS-V: a 1 Sterad IFU Survey of the Milky Way and the Local Group (University of Texas at Austin)
Abstract
The LVM in SDSS-V will take the first step towards the “spectral panopticon”, a full spectroscopic image of the sky, providing optical IFU data-cubes to resolve, e.g., SF structures, GMCs, H II regions and young stellar clusters. The LVM will cover the bulk of the MW disk at 0.1-1 pc resolution, the Magellanic Clouds at 10 pc resolution, M31 & M33 at 20 pc resolution, and Local Volume galaxies out to a distance of 8 Mpc at ∼ 25-100 pc resolution, in total about 1 steradian of sky. LVM covers the full optical bandpass at R~4000. Optical spectroscopy specifically addresses two physical components of galaxies: the ionized ISM and stellar populations. The LVM sky coverage will overlap with datasets of stellar spectra from SDSS-III,IV and V, resolved photometry of individual stars and color-magnitude diagrams (CMDs) in the LMC, SMC (ground based), M31, and M33 (HST). In the MW, we complement the SDSS-III, IV, and V APOGEE spectroscopy of millions of stars by probing the ISM around them. Using the stellar types, ages and abundances from APOGEE we will be able to infer and probe the radiation field and wind momentum input of stars back into the ISM. Across all the Local Volume targets, LVM will overlap with far-IR, sub-mm, and radio datasets probing the cold phases of the ISM (dust, H2, and H I), connecting the onset and effects of SF to local ISM conditions. In the Magellanic Clouds and the MW, LVM will probe the ionization of gas around X-ray binaries (including a full census of X-ray sources in the LMC by the eROSITA satellite) opening a window to study the interaction of accretion onto stellar mass black holes and the surrounding ISM. The wide area covered by the LVM will sample a large variety of SF regions caught at different stages of their life cycles, as probed by the age estimated from resolved stellar data (stellar spectroscopy and CMDs).
15/05 - 02:00 pm
Juna Kollmeier
Abstract ⓘ
Abstract
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Juna Kollmeier
Title
SDSS-V: Pioneering Panoptic Spectroscopy (Carnegie Institution for Science)
Abstract
I will describe the current plans for the Fifth Generation of SDSS. SDSS-V will be an unprecedented all-sky spectroscopic survey of over six million objects. It is designed to decode the history of the Milky Way galaxy, trace the emergence of the chemical elements, reveal the inner workings of stars, and investigate the origin of planets. It will provide the most comprehensive all-sky spectroscopy to multiply the science from the Gaia, TESS and eROSITA missions. SDSS will also create a contiguous spectroscopic map of the interstellar gas in the Milky Way and nearby galaxies that is 1,000 times larger than the state of the art, uncovering the self-regulation mechanisms of galactic ecosystems. It will pioneer systematic, spectroscopic monitoring across the whole sky, revealing changes on timescales from 20 minutes to 20 years. The project is now developing new hardware to build on the SDSS-IV infrastructure, designing the detailed survey strategy, and actively seeking to complete its consortium of institutional and individual members.
10/05 - 11:00 am
David Alonso
Abstract ⓘ
Abstract
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David Alonso
Title
Galaxy clustering and weak lensing with LSST (University of Oxford)
Abstract
I will describe the potential of LSST to constrain dark energy and other cosmological phenomena. In particular I will focus on the work currently being done within the collaboration to prepare ourselves to analyze the data after 2021. I will focus on a few projects I have been involved in: the development of the Core Cosmology Library, the construction of an end-to-end analysis pipeline for large-scale structure data, the recent 3x2pt pipeline project, and the development of TJPCosmo, a general and robust joint-probes likelihood module for the analysis of the 5 DESC probes.
03/05 - 11:00 am
Niel Brandt
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Abstract
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Niel Brandt
Title
Supermassive Black Hole Studies with the LSST (The Pennsylvania State University)
Abstract
The LSST will enable studies of the growing supermassive black holes (SMBHs) in active galactic nuclei (AGNs) on a truly massive scale. After a brief review of the LSST surveys from an AGN perspective, I will describe the selection of tens of millions of AGNs using LSST plus multiwavelength data. I will then highlight three examples of exciting LSST AGN science investigations: massive AGN variability studies, transient SMBH fueling events, and high-redshift AGNs. I will end by describing the details of the LSST AGN Science Collaboration, its ongoing activities, and its future plans.
26/04 - 11:00 am
Dominique Boutigny
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Abstract
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Dominique Boutigny
Title
The LSST data processing and data analysis centers in France (National Institute of Nuclear and Particle Physics)
Abstract
Together with NCSA, the IN2P3 Computing Center (CC-IN2P3) in France will be processing 50% of the LSST data to produce the annual Data Releases. Both computing centers will then exchange their respective data sets to constitute a complete data archive at both sites. In parallel, IN2P3 is also planning to deploy an LSST Data Access Center with analysis capabilities, targeting the science community. These projects contains several technical challenges that I will describe in details. I will also expose the strategy that we have put in place in order to check that the designed technical solutions are actually matching the scientific needs.
19/04 - 03:00 pm
Melissa Graham
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Abstract
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Melissa Graham
Title
LSST Data Products (University of Washington)
Abstract
The LSST will begin preliminary commissioning next year, and is projected to start its 10-year survey of the southern sky in 2022. I will provide a brief overview of the main science drivers and survey design, and give a status update of the project with a focus on the LSST\\\\\\\'s Data Management system: the data processing pipelines, the products they generate (images, catalogs, and alerts), the planned user interface for scientific queries and analysis, and the data access timescales and policies that are relevant to Brazilian astronomers. I will also cover the current activities of the LSST Science Collaborations, which are actively engaging the community to prepare for LSST, and their existing channels for communication and participation. Finally, I will outline the open opportunities for future users to help LSST refine its observational strategies for the main survey (wide-fast-deep), mini-surveys, and deep drilling fields.
12/04 - 01:00 pm
Francisco Javier
Abstract ⓘ
Abstract
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Francisco Javier
Title
Introduction to the DESC Data Challenge 2 (University of California, Irvine)
Abstract
With the advent of the next generation galaxy surveys, a need for higher precision modeling and systematics control arises. End-to-end simulations are a great tool to achieve these goals. Though more traditional in particle physics, in the recent years there has been an effort from the astronomical/cosmological community to generate high-fidelity simulated astronomical images. The Dark Energy Science Collaboration (DESC) is now involved in the so-called Data Challenge 2 (DC2), which constitutes a collaboration-wide effort to generate synthetic mocks and simulated images to perform end-to-end analyses. I will give a detailed overview of this data challenge: what it is, what the goals are and how DESC collaborators can get involved.
05/04 - 10:00 am
Andreas Wicenec
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Abstract
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Andreas Wicenec
Title
Data Intensive Astronomy Primer (University of Western Australia)
Abstract
In this presentation I will try to bridge historic efforts of humankind to gather and use knowledge and understanding of astronomical phenomena to the modern era of collecting and analysing exponentially growing amounts of digital data while keeping the number of scientists almost constant. I will describe the challenges posed by this obvious bottleneck and also present work we are undertaking in tackling them in order to enable scientists to efficiently extract knowledge.
29/03 - 11:00 am
Kyle Chard
Abstract ⓘ
Abstract
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Kyle Chard
Title
Parsl: Parallel Scripting in Python (University of Chicago)
Abstract
Scientists are increasingly reliant on the analysis of large datasets and use of parallel computing resources. While scientific workflows have long been used to simplify the construction of parallel applications, few systems are well equipped to handle new forms of analysis such as those presented by machine learning and data analytics, interactive analysis in Jupyter notebooks, and online computing. The task of developing and executing a variety of analyses at scale can be difficult, requiring complex orchestration and management of applications, data staging across wide area networks, and customization for specific execution environments. In this talk we introduce Parsl (Parallel Scripting Library), a pure Python library for orchestrating the concurrent execution of multiple tasks that is designed to meet the needs of new analysis modalities. Parsl is remarkable for its simplicity. Developers simply annotate functions (either pure Python or wrappers around shell programs) and write application logic to link these functions in Python. Calls to these annotated functions then result in the creation of “tasks” that run concurrently with the main program and other tasks, subject to dataflow constraints defined by the availability of input data. Parsl abstracts hardware details, allowing the same script to be executed efficiently on one or more laptops, clusters, clouds, and/or supercomputers.
22/03 - 11:00 am
Dante Minniti
Abstract ⓘ
Abstract
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Dante Minniti
Title
The VVVX survey of the Milky Way: status and new results (Universidad Andrés Bello)
Abstract
The ESO Public Survey VISTA Variables in the Via Lactea (VVV) has been mapping the Milky Way bulge and the Southern mid-plane in the near-IR since 2010. An extension of this survey started to map the gaps left between the coverage of the VISTA Hemisphere Survey and the VVV Survey. This VVV eXtended Survey (VVVX) would take about 200 nights in total, covering 2x10^9 point sources within an area of about 1700 sq deg. The area survey includes about 50 known globular clusters, and >1000 known open clusters, with many more clusters to be found. The final products will be deep JHKs-band images, and catalogues of variable point sources, and of proper motions. The main aims are to study the different stellar populations present in the inner Galaxy, and to produce a 3-D map of the surveyed region using well-known distance indicators (such as RR Lyrae, Cepheids, and red clump giants). In order to do all this, it is critical to do a variability search, and to have a good understanding of the effects of reddening and extinction in the near-IR. Within the existing bulge VVV area proper motions would also be available. In particular, the VVVX results will be an essential complement to forthcoming near-IR multiplexing spectrographs (MOONS, APOGEE-S). In addition, the VVVX survey results will complement the expected measurements from important space missions (GAIA, WFIRST).
15/03 - 03:00 pm
Knut Olsen
Abstract ⓘ
Abstract
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Knut Olsen
Title
Preparing for Milky Way and Local Volume Science with LSST (NOAO)
Abstract
LSST will be revolutionary for Milky Way and Local Volume science. I will discuss a few Milky Way-related science cases that will benefit from LSST measurements, with particular focus on science related to the Magellanic Clouds. I will also discuss some of the technical challenges that we need to overcome to maximize LSST’s output with respect to these science cases. Finally, I will indicate a number of ways in which the stellar populations scientific community is preparing for LSST, including organizing topical science workshops and using existing datasets to address some of the challenges. A key goal of the NOAO Data Lab is to give scientists a platform for experimenting with workflows applicable to the LSST era.
08/03 - 11:00 am
Hugo Camacho
Abstract ⓘ
Abstract
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Hugo Camacho
Title
Measurement of the Baryon Acoustic Oscillation scale at z=1 with Dark Energy Survey Year 1 data (USP)
Abstract
BAO measurements has been proven to be a robust and precise method for measuring cosmological distances when using spectroscopic redshifts. In this webinar we will show how a similar level of robustness can be achieved using purely photometric data. We will present measurements of the BAO signal in galaxies selected from the first year of Dark Energy Survey data with an effective area of 1318 square degrees and photometric redshifts in the range [0.6, 1.0]. The results shown to be consistent with the flat Lambda-CDM concordance cosmological model supported by numerous other recent experimental results, robust to a number of stress tests and consistent with simulations of the DES Y1 dataset.
01/03 - 11:00 am
David Rosario
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David Rosario
Title
The resilience of cold molecular gas to AGN feedback in local luminous Seyfert galaxies (Durham University)
Abstract
The properties of cold molecular gas in galaxies are sensitive to the nature and efficiency of star-formation within molecular clouds. I will report on a carefully controlled CO spectroscopic study of a complete volume-limited set of the most luminous nearby (D < 40 Mpc) Seyfert galaxies, to understand whether their gas fractions and star-formation efficiencies are influenced by the presence of the AGN. We find no difference between AGN and inactive galaxies; indeed, the star-formation efficiencies in the centres of Seyferts are consistent with their larger-scale discs. Putting this in the context of relevant energies and timescales, we examine the resilience of star-forming molecular gas against the effects of AGN feedback.
16/02 - 11:00 am
Mark G. Allen
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Mark G. Allen
Title
CDS - an astronomy data centre for reference data (Strasbourg astronomical Data Center)
Abstract
The CDS is an astronomy data centre that develops services that are widely used by the international community: SIMBAD, the reference database for nomenclature and bibliography of astronomical objects (outside the solar system), VizieR, the service for astronomical catalogues and tables published in journals, the Aladin interactive sky atlas and VO portal, and the CDS X-Match large catalogue cross-correlation service. The content of the CDS is built with strong collaborative relationships with the astronomy journals, observatories, space agencies and projects. The CDS services are compliant with IVOA standards, and the CDS helps build the astronomy data e-Infrastructure via contributions to the definition of the standards. Recent advances in all-sky VO technologies have enabled new innovative ways of using astronomy data, one example being the CDS Aladin-Lite tool and the Hierarchical Progressive Surveys (HiPS) system for the sharing of large survey data. This system is being widely implemented such as in ESASky, JAXA, NOAO and many more, forming a HiPS network and being standardised at IVOA. It is also an integral part of the newly released CDS Portal. In this presentation I will highlight recent advances, the challenges, and future directions of the CDS.
15/02 - 04:00 pm
Meg Schwamb
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Meg Schwamb
Title
Exploring the Solar System with LSST (Gemini North Observatory)
Abstract
The Large Synoptic Survey Telescope (LSST) is uniquely equipped to search for Solar System bodies due to its unprecedented combination of depth and wide field coverage. Starting in 2022, LSST will generate the largest catalog of Solar System objects to date. Over its 10-year lifespan, LSST is expected to catalog over 5 million Main Belt asteroids, almost 300,000 Jupiter Trojans, over 100,000 Near Earth Objects (NEOs), over 40,000 Kuiper belt objects (KBOs), tens of interstellar objects, and over 10,000 comets. Many of these objects will receive hundreds of observations in multiple bandpasses. LSST will report detections of moving objects in various filters (ugrizy) between approximately 16 and 24.5 magnitudes (in r band) over its observing footprint (covering ∼18,000 square degrees in the Wide-Fast-Deep survey), link these detections into orbits, and provide metadata on observing conditions. It will be up to the planetary community to apply a wide variety of methods to synthesize and combine this information in order to fully leverage the LSST dataset for Solar System science. I will present an overview of LSST\'s capabilities and describe the current and future efforts of the LSST Solar System Science Collaboration (SSSC) to prepare methods and tools to analyze this data, as well as understand optimum survey strategies for discovering moving objects throughout the Solar System.
01/02 - 12:00 pm
Bradley Peterson
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Bradley Peterson
Title
Big Bang to Biosignatures: The LUVOIR Mission Concept (The Ohio State University)
Abstract
The Large Ultraviolet, Optical, and Infrared Surveyor (LUVOIR) is one of the future-generation mission concepts identified in the NASA Astrophysics Roadmap of 2014. NASA is currently funding studies of four flagship-class missions with the intent of identifying the science goals and concomitant technical requirements to make sure that the mission concepts are sufficiently mature that they could be recommended as priorities by the 2020 NRC decadal survey. Each mission concept is being studied by a community-based Science and Technology Definition Team (STDT). The LUVOIR STDT is studying two telescope concepts, both using segmented mirrors that will autonomously deploy in space, like the James Webb Space Telescope (JWST). The notional designs are a 15.1-m aperture that will require the 8.4-m fairing of the Block 2 Space Launch System and a 9.2-m that can be launched in a 5-m fairing on a smaller, although still highly capable, launch vehicle. The LUVOIR STDT is studying imagers and spectrographs that cover the range 100 nm to 2.5 microns and have 100-1000 times the performance of the Hubble Space Telescope (HST). A coronagraph that will enable detection of Earth-like planets in the habitable zone of nearby stars is one the highest priorities and biggest challenges. LUVOIR is being designed to be serviceable, even though this will be a challenge from its orbit at Sun-Earth L2. Opportunities for international contributions will be sought. It is expected that the LUVOIR science program will be driven largely by guest observers, in the same manner as HST and JWST, and will be used for a wide variety of astronomical observations, from cosmology to exoplanets to our own Solar System.
25/01 - 03:00 pm
Stephanie Juneau
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Stephanie Juneau
Title
Science & Discovery with the NOAO Data Lab (NOAO)
Abstract
As we keep progressing into an era of increasingly large astronomy datasets, the NOAO Data Lab (datalab.noao.edu), is developing a suite of analysis tools to maximize potential for discoveries and extraction of scientific knowledge. The services are organized around large astronomy surveys – both in-house and external – and include databases, query managers, virtual storage space, workflows through our Jupyter Notebook server, or scripted analysis with the ‘datalab’ command. Working at the intersection of astronomy and data science, our main goal is to provide users with tools to work close to the data, and thus optimize the scientific productivity of the astronomy community. We currently host datasets from NOAO facilities such as the Dark Energy Survey (DES), the DESI imaging Legacy Surveys (LS), the Dark Energy Camera Plane Survey (DECaPS), and the nearly all-sky NOAO Source Catalog (NSC). We are further preparing for large spectroscopic datasets such as DESI. After an overview of the Data Lab and datasets, I will showcase scientific applications on topics such as star/galaxy separation, finding dwarf galaxies, and extragalactic large-scale structures. I will also present steps for new users to get started conducting their own analysis, and describe our vision for future developments as we tackle the next technical and scientific challenges.