14 - 16 juin 2010 - IAP, Paris

http://www.oca.eu/rousset/EGSG

In order to optimize the scientific return of the Gaia mission for the extragalactic objects, this first dedicated workshop will gather people for discussing ideas for relevant science cases related to the physics and properties of Active Galaxy Nuclei, unresolved galaxies and intergalactic medium as well as to the reference frames and ICRF issues.
The 3 concerned communities are involved at different levels in the preparation of Gaia mission :
The group of DPAC scientists already working on ’Unresolved Galaxies’ has identified pending issues to be discussed ; Scientists working on ’Reference Frames’ should benefit from information on the Physical Processes in Quasars that may impact the Astrometry. On the other hand, the community which will work on Active Galaxy Nuclei is still to be identified from relevant science cases with the forthcoming Gaia data. Moreover, all communities need accurate information about how Extragalactic Objects will be detected and Characterised. A major goal of this workshop will be to identify mutual objectives.
During this 3-days workshop, the following topics will be discussed :
a) Astrometry
- VLBI observations of QSOs
- The ICRF2, present materialization of ICRS
- The compilations of quasars
- Densification of the ICRS at optical wavelengths
- Astrometric reduction of fields before and after Gaia
b) Unresolved Galaxies
- Detection of extended sources
- Normal galaxies : Spectral Energy Distributions, profiles, abundances, luminosity functions, mass distributions
- Galaxy environments : supernovae counts, tidal effects, Active Galaxy Nuclei feedback
- "Active" galaxies : starbursts, radiogalaxies, nucleated dwarfs, merging galaxies
c) Quasars, Active Galaxy Nuclei and Intergalactic Medium
- Luminosity functions
- Correlation functions and clustering properties
- Source variabilities, jets and accretion/ejection mechanism
- Intergalactic medium
- Lensing effects
- Micro-quasars