arXiv 1102.13162011-02-07astro-ph.CO

GALEX紫外室女座星系团巡天（GUViCS）。I：中央12平方度的UV光度函数

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. P. Haynes, M. Baes, C. Balkowski, … 展开作者

A. Boselli, S. Boissier, S. Heinis, L. Cortese, O. Ilbert, T. Hughes, O. Cucciati, J. Davies, 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. Jordán, 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

备注：: 18 pages, 14 figures, accepted in A&A, high resolution version of figure 1 and 2 and other information available at http://galex.oamp.fr/guvics/observations.html
DOI：: 10.1051/0004-6361/201016389

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摘要：

GALEX紫外线室女星系团巡天（GUViCS）是对室女星系团的一次完全盲测，覆盖面积约为40平方米。°的在远UV（FUV，λ_eff = 1539 A，Δ-λ = 442 A）和约120 sq.°的在近紫外（NUV，λ_eff = 2316 A，Δ-λ = 1060 A）。调查的目标是研究星系在丰富的星系团环境中的紫外线（UV）特性，涵盖从巨星到矮星的广泛光度范围，而不管其恒星形成活动的先验知识。紫外线数据将与其他波段（光学：NGVS;远红外-submm：HeViCS; HI：ALOFA）中的数据相结合，并与我们的星系演化的多区化学分光光度模型相结合，以完整和详尽地研究环境对高密度区域星系演化的影响。我们在这里提出的调查的科学目标，描述的观测策略，并简要讨论不同的数据处理技术。使用紫外线数据已经在手的中央12平方米。°的我们确定了室女星系团核心所有成员的FUV和NUV光度函数，并分别对早型和晚型星系进行了测定，并将其与外场和其他邻近星系团（Coma，A1367）的结果进行了比较。分析表明，室女星系团核心的FUV和NUV光度函数比后发座和A1367的光度函数更平坦（α约为-1.1）。我们讨论了这种差异的可能来源

英文摘要：

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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