EAS Publications Series
Volume 45, 2010GAIA: At the Frontiers of Astrometry
|Page(s)||337 - 342|
|Published online||15 February 2011|
C. Turon, F. Meynadier and F. Arenou (eds)
EAS Publications Series, 45 (2010) 337-342
The Unresolved Galaxies with Gaia
National and Kapodistrian University of Athens, Faculty of
2 National Observatory of Athens, Athens, Greece
3 Institut d’Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France
4 Université de Paris-Sud XI, I.A.S., 91405 Orsay Cedex, France
5 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
Classification and parametrization of unresolved galaxies to be detected by Gaia is the goal of our contribution to DPAC/CU8. Gaia will observe more than several times 106 unresolved galaxies seen almost as point sources. For the classification and parametrization of these sources we have undertaken the following tasks: a) providing libraries of synthetic galaxy spectra (produced under the PÉGASE.2 code of galaxy evolution) and a semi-empirical library using observed galaxy spectra from SDSS data archive. b) Developping an appropriate algorithm called Unresolved Galaxy Classifier (UGC). The algorithm is being developed implementing the Support Vector Machines (SVM), a supervised training technique. This algorithm utilizes Gaia simulated BP/RP galaxy spectra of our synthetic galaxy library.
© EAS, EDP Sciences 2011
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