Found 24 talks archived in Catalogs and data

james_j_binney_100318s
Thursday March 18, 2010
Prof. James J. Binney
Rudolf Peierls Centre for Theoretical Physics, Oxford University, UK

Abstract

The study of the Milky is expected to have a major impact on our understanding of how galaxies form and evolve. "Near-field cosmology" is being vigorously pursued through a series of major surveys of the Galaxy's stellar content (2-MASS, SDSS, RAVE, Hermes, Apogee, Gaia) that are either in hand or pending. It will be argued that what we want to know is deeply buried in these data and can only be extracted by comparing the surveys with a hierarchy of dynamical models of ever increasing complexity. Work currently being done to build such hierarchical models will be described, and some early results from this work will be summarised.

escuela_vo_04s
Thursday March 4, 2010
Drs. Enrique Solano, Miriam Aberasturi, Raúl Gutiérrez, Francisco Jiménez
Centro de Astrobiología, LAEFF, Spain

Abstract

El curso tendrá un carácter eminentemente práctico. Tras una breve serie de presentaciones sobre el proyecto Observatorio Virtual y las herramientas de análisis existentes se procederá al desarrollo de casos científicos reales utilizando una metodología VO. El desarrollo de estos casos científicos se realizará bajo la supervisión de personal del Observatorio Virtual Español.

escuela_vo_03s
Wednesday March 3, 2010
Drs. Enrique Solano, Miriam Aberasturi, Raúl Gutiérrez, Francisco Jiménez
Centro de Astrobiología, LAEFF, Spain

Abstract

El curso tendrá un carácter eminentemente práctico. Tras una breve serie de presentaciones sobre el proyecto Observatorio Virtual y las herramientas de análisis existentes se procederá al desarrollo de casos científicos reales utilizando una metodología VO. El desarrollo de estos casos científicos se realizará bajo la supervisión de personal del Observatorio Virtual Español.

escuela_vo_02s
Tuesday March 2, 2010
Drs. Enrique Solano, Miriam Aberasturi, Raúl Gutiérrez, Francisco Jiménez
Centro de Astrobiología, LAEFF, Spain

Abstract

El curso tendrá un carácter eminentemente práctico. Tras una breve serie de presentaciones sobre el proyecto Observatorio Virtual y las herramientas de análisis existentes se procederá al desarrollo de casos científicos reales utilizando una metodología VO. El desarrollo de estos casos científicos se realizará bajo la supervisión de personal del Observatorio Virtual Español.

escuela_vo_02bs
Tuesday March 2, 2010
Drs. Enrique Solano, Miriam Aberasturi, Raúl Gutiérrez, Francisco Jiménez
Centro de Astrobiología, LAEFF, Spain

Abstract

El curso tendrá un carácter eminentemente práctico. Tras una breve serie de presentaciones sobre el proyecto Observatorio Virtual y las herramientas de análisis existentes se procederá al desarrollo de casos científicos reales utilizando una metodología VO. El desarrollo de estos casos científicos se realizará bajo la supervisión de personal del Observatorio Virtual Español.

escuela_vo_01s
Monday March 1, 2010
Drs. Enrique Solano, Miriam Aberasturi, Raúl Gutiérrez, Francisco Jiménez
Centro de Astrobiología, LAEFF, Spain

Abstract

El curso tendrá un carácter eminentemente práctico. Tras una breve serie de presentaciones sobre el proyecto Observatorio Virtual y las herramientas de análisis existentes se procederá al desarrollo de casos científicos reales utilizando una metodología VO. El desarrollo de estos casos científicos se realizará bajo la supervisión de personal del Observatorio Virtual Español.

roberto_cid_fernandes_100208s
Monday February 8, 2010
Dr. Roberto Cid Fernandes
Universidade Federal de Santa Catarina, Florianopolis, Brazil

Abstract

This talk is divided into two related parts. First, we will call your attention to a basic, but often overlooked worrying fact, and presents ways of dealing with it. The fact is: an enormous number of galaxies in surveys like the SDSS have emission lines which are too weak (low S/N) to be classified by usual schemes (ie, diagnostic diagrams). It turns out that most of these are AGN-like, so ignoring them on the basis of low S/N (which most people do) leaves as much as 2/3 of these emission line galaxies unaccounted for. The solution: We present a number of alternative methods to rescue this numerous population from the classification limbo. We find that about 1/3 of these weak-line galaxies are massive, metal rich star-forming systems, while the remaining 2/3 are more like LINERs. In the second part, we revisit the old idea by Binette et al (1994) that post-AGB stars can account for the emission line properties of some galaxies. A "retired galaxy" model is presented and compared to data in the SDSS. We find that about 1/4 of the galaxies classified as LINERs in the SDSS are consistent with this model, where all ionizing radiation is of stellar origin. More dramatically, nearly 100% of weak-line LINERs are perfectly consistent with being just retired galaxies, with no active nucleus. If these ideas are correct, contrary to current practice, relatively few LINERs should be counted as bona fide AGN.

nicolas_lodieu_100128s
Thursday January 28, 2010
Dr. Nicolas Lodieu
Instituto de Astrofísica de Canarias, Spain

Abstract

In this Breaking News seminar, I will describe our project dedicated to the search for ultracool low-metallicity dwarfs (or subdwarfs) in the large-scale databases. The highlight of the seminar is the discovery of a mid-L subdwarf, the fifth known to date, and the first one identified in the UKIRT Infrared Deep Sky Survey (UKIDSS). The spectroscopic nature of this subdwarf was confirmed with data obtained with GTC/OSIRIS in April 2009.

david_koo_090716s
Thursday July 16, 2009
Prof. David Koo
University of California Observatories, Lick Observatory, USA

Abstract

AEGIS (All-wavelength Extended Groth strip International Survey: aegis.ucolick.org) is on-going survey that opens up new views of the development of galaxies and AGN's at redshifts z about 1. AEGIS is panchromatic like GOODS, with coverage ranging from X-ray to radio, and nearly as deep but more panoramic by covering a 4x larger region. Its backbone is the most Northern (accessible to the GTC) of the four fields of the DEEP2 Keck spectroscopic survey, which provides not only precision redshifts that yield reliable pairs, groups, and environments, but also internal kinematics and chemical abundances. After an overview of the DEEP and AEGIS surveys, I will share some recent highlights, including using a new kinematic measure for distant galaxies to track Tully-Fisher-like evolution; discovering metal poor, massive, luminous galaxies; finding ubiquitous galactic gas outflows among distant star forming galaxies; and exploring the nature of distant x-ray AGNs.

nick_scoville_090312s
Thursday March 12, 2009
Dr. Nick Scoville
California Institute of Technology, USA

Abstract

The COSMOS survey is the largest high redshift galaxy evolution survey ever done -- imaging 2 square degrees with all major space-based and ground based observatories. I will describe the key data in the survey and then present recent results on large-scale structures, the dark matter distributions and galaxy evolution.


Upcoming talks

Featured talks