The Unresolved Galaxies with Gaia

Details The Unresolved Galaxies with Gaia The Unresolved Galaxies with Gaia

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....45..337k&link_type=abstract

EAS Publications Series, Volume 45, 2011, pp.337-342

Physics

Scientific paper

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.

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