Início » Tecnologia & Inovação » Webinars Técnico » 2015
19/11 - 02:00 pm
Erik Tollerud
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Abstract
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Erik Tollerud
Title
The Development of Astropy and Using it to Identify Local Volume Dwarf Galaxies (Space Telescope Science Institute)
Abstract
I will describe the Astropy Project, a community library for Python in Astronomy. I will describe the origins of Astropy, as well as some key aspects of how we develop Astropy. I will further discuss how this (along with other factors) has lead to the explosive growth of the Astropy community since the project’s inception. I will then discuss an effort I have been leading recently to identify nearby (Local Volume) dwarf galaxies, and describe how many of the critical steps were enabled by Astropy and its affiliated packages.
Slides not available
22/10 - 01:00 pm
Dustin Lang
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Abstract
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Dustin Lang
Title
The DECam Legacy Survey: image reductions using The Tractor (Carnegie Mellon University, University of Waterloo)
Abstract
The Dark Energy Camera (DECam) Legacy Survey is a mid-size survey of about 6000 square degrees of the equatorial sky in g,r,z filters to 2 mags deeper than SDSS. These images overlap millions of spectra from SDSS and BOSS, so should be useful for a variety of science cases. It is a public survey: the raw images have zero proprietary period, and we aim to do public data releases every 6 months. I’ll introduce the survey and the data reduction approach we’re using: a forward-modeling code called the Tractor, which allows us to make simultaneous measurements in images taken in a variety of bands and in a variety of observing conditions, and even from multiple instruments.
Slides not available
30/07 - 02:00 pm
Francisco Förster Burón
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Abstract
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Francisco Förster Burón
Title
The High cadence Transient Survey (HiTS): real-time detection of supernovae and other transients with DECam (Universidad de Chile)
Abstract
At the Astroinformatics Laboratory of the Center for Mathematical Modelling (CMM) at the University of Chile and the Millennium Institute for Astronomy (MAS) we have developed a novel transient detection pipeline to be used in real-time with data from the Dark Energy Camera (DECam). DECam is a 520 Megapixel CCD camera with an unprecedented wide angle field of view mounted on the 4m Blanco telescope at the Cerro Tololo Inter-American Observatory (CTIO). During 5/6 contiguous nights in the 2014/2015 we were able to achieve the real-time data analysis of more than 120/150 square degrees of the sky with a cadence of only 2/1.6 hours. We processed more than 1000 billion pixels in total, leading to the discovery of 30/90 new SNe. We also found thousands of previously unknown asteroids and hundreds of variable stars that can be used to map the structure of the outer parts of the Milky Way.
21/05 - 10:00 am
Emmanuel Bertin
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Emmanuel Bertin
Title
The DANCe project: recycling 15 years of archival wide-field data for kinematic studies (Institut d’Astrophysique de Paris)
Abstract
The DANCe (Dynamical Analysis of Nearby ClustErs) project aims at deriving a comprehensive census of the stellar and substellar content of a number of nearby (1 kpc) young (500 Myr) associations. Members are identified based on their kinematics properties, ensuring little contamination from background and foreground sources. I will show how robust individual proper motions can be computed with a precision better than 1 mas/yr by combining thousands of wide-field images downloaded from public archives and covering more than a decade of observations. I will present the first results of the survey and discuss the technical challenges associated with the use of large wide-field image datasets from existing public archives.
Slides not available
28/04 - 02:00 pm
Paolo Giommi
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Abstract
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Paolo Giommi
Title
The ASI Science Data Center: Scientific results and technical activities (ASDC)
Abstract
The ASI Science Data Center (ASDC) is a facility of the Italian Space Agency dedicated to the acquisition, processing, archival and distribution of scientific data from several scientific satellites, 13 of which are currently operational. It operates in the fields of astrophysics, cosmology, solar system exploration, and cosmic-rays. A general overview of the ASDC will be presented together with the description of some on-going activities aimed at establishing a similar facility in Brazil, in cooperation with several Brazilian institutions. Some of the most relevant scientific results, mostly in extragalactic astrophysics will also be presented.
Slides not available
05/02 - 04:00 pm
Eric Bellm
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Eric Bellm
Title
The Dynamic Universe (Caltech)
Abstract
The advent of wide-field synoptic imaging has re-invigorated the venerable field of time domain astronomy. We begin with various science results from the ongoing Palomar Transient Factory (PTF) survey — newborn supernovae, gap transients, orphan afterglows, relativistic explosions and near earth asteroids. Our next-generation survey, the Zwicky Transient Facility (ZTF), provides more than an order of magnitude improvement in survey speed. We describe its design, science goals, and public surveys. Mansi Kasliwal (Carnegie Observatories) Eric Bellm (Caltech)
29/01 - 10:00 am
Christopher Bonnet
Abstract ⓘ
Abstract
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Christopher Bonnet
Title
Machine learning for photometric redshifts (Institut de Fisica d’Altes Energies)
Abstract
I will be discussing the current state of machine learning for photometric redshifts from a machine learning standpoint and a astronomy standpoint. This include usage of algorithms, PDF estimation and handling of the photometric errors. I will give an overview of the current status in the DES. I will talk about the pitfalls that we face and the problems we will have to solve if we are wanting to perform precision cosmology with 5-year DES data (or LSST, Euclid).
Slides not available