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The Unresolved Galaxies with Gaia

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
M. Kontizas ,
I. Bellas-Velidis ,
B. Rocca-Volmerange ,
E. Kontizas ,
P. Tsalmantza ,
E. Livanou  and
A. Dapergolas
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M. Kontizas
Affiliation:
National and Kapodistrian University of Athens, Faculty of Physics, Athens, Greece
I. Bellas-Velidis
Affiliation:
National Observatory of Athens, Athens, Greece
B. Rocca-Volmerange
Affiliation:
Institut d’Astrophysique de Paris, 98bis Bd. Arago, 75014 Paris, France Université de Paris-Sud XI, I.A.S., 91405 Orsay Cedex, France
E. Kontizas
Affiliation:
National Observatory of Athens, Athens, Greece
P. Tsalmantza
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
E. Livanou
Affiliation:
National and Kapodistrian University of Athens, Faculty of Physics, Athens, Greece
A. Dapergolas
Affiliation:
National Observatory of Athens, Athens, Greece
A. Karampelas
Affiliation:
National and Kapodistrian University of Athens, Faculty of Physics, Athens, Greece
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 337 - 342
Copyright
© EAS, EDP Sciences 2011

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References

Références

Belcheva, M., et al., this volume
Fioc, M., & Rocca-Volmerange, B., 1997, A&A, 326, 950
Karampelas, A., et al., in preparation
Livanou, E., et al., 2009, GAIA-C8-TN-UOA-EL-001-1
Rana, N.C., & Basu, S., 1992, A&A, 265, 499
Tsalmantza, P., et al., 2007, A&A, 470, 761
Tsalmantza, P., et al., 2009, A&A, 504, 1071
Tsalmantza, P., et al., in preparation, GAIA-C8-TN-UOA-PAT-003-1