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

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arxiv 1102.1316 v1 pith:KELNU65U submitted 2011-02-07 astro-ph.CO

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
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L. Ferrarese R. Giovanelli M. P. Haynes M. Baes C. Balkowski N. Brosch S. C. Chapman V. Charmandaris M. S. 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. Jord\'an K. M. Hess M. Huertas-Company L. K. Hunt B. R. Kent D. G. Lambas A. Lancon 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
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classification astro-ph.CO
keywords clustersurveyvirgoluminositydatagalaxiesultravioleta1367
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The GALEX Ultraviolet Virgo Cluster Survey (GUViCS) is a complete blind survey of the Virgo cluster covering about 40 sq. deg. in the far UV (FUV, lambda_eff=1539A, Delta-lambda=442A) and about 120 sq. deg. in the near UV (NUV, lambda_eff=2316A, Delta-lambda=1060A). 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 about -1.1) than those determined in Coma and A1367. We discuss the possible origin of this difference

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