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The GALEX Ultraviolet Virgo Cluster Survey(GUViCS). I. The UV luminosity function of the central 12 sq. Deg

A. Boselli, S. Boissier, S. Heinis, L. Cortese, O. Ilbert, T. Hughes, O. Cucciati, J. Davies, L. Ferrarese, R. Giovanelli, M. Haynes, M. Baes, C. Balkowski, N. Brosch, S. Chapman, V. Charmandaris, M. Clemens, A. Dariush, I. De Looze, S. Di Serego Alighieri, P.-A. Duc, P. R. Durrell, E. Emsellem, T. Erben, J. Fritz, D. A. Garcia-Appadoo, G. Gavazzi, M. Grossi, A. Jordßn, K. M. Hess, M. Huertas-Company, L. K. Hunt, B. R. Kent, D. G. Lambas, A. Lanšon, L. A. MacArthur, S. C. Madden, L. Magrini, S. Mei, E. Momjian, R. P. Olowin, E. Papastergis, M. W. L. Smith, J. M. Solanes, O. Spector, K. Spekkens, J. E. Taylor, C. Valotto, W. van Driel, J. Verstappen, C. Vlahakis, B. Vollmer, E. M. Xilouris

Abstract
The GALEX Ultraviolet Virgo Cluster Survey(GUViCS) is a complete blind survey of the Virgo cluster covering ~40 sq. deg in the far UV(FUV, lambdaeff = 1539 ┼, Deltalambda = 442 ┼) and ~120 sq. deg in the near UV(NUV, lambdaeff = 2316 ┼, Deltalambda = 1060 ┼). The goal of the survey is to study the ultraviolet(UV) properties of galaxies in a rich cluster environment, spanning a wide luminosity range from giants to dwarfs, and regardless of prior knowledge of their star formation activity. The UV data will be combined with those in other bands(optical: NGVS; far-infrared - submm: HeViCS; HI: ALFALFA) and with our multizone chemo-spectrophotometric models of galaxy evolution to make a complete and exhaustive study of the effects of the environment on the evolution of galaxies in high density regions. We present here the scientific objectives of the survey, describing the observing strategy and briefly discussing different data reduction techniques. Using UV data already in-hand for the central 12 sq. deg we determine the FUV and NUV luminosity functions of the Virgo cluster core for all cluster members and separately for early- and late-type galaxies and compare it to the one obtained in the field and other nearby clusters(Coma, A1367). This analysis shows that the FUV and NUV luminosity functions of the core of the Virgo clusters are flatter(alpha ~ -1.1) than those determined in Coma and A1367. We discuss the possible origin of this difference.

Keywords
galaxies: clusters: individual: Virgo - galaxies: evolution - galaxies: fundamental: parameters - ultraviolet: galaxies - galaxies: luminosity: function - mass: function

Astronomy and Astrophysics
Volume 528, Number of pages 107_1
2011 March

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Instituto de Astrof├şsica e Ci├¬ncias do Espa├žo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Funda├ž├úo para a Ci├¬ncia e a Tecnologia COMPETE 2020 PORTUGAL 2020 Uni├úo Europeia