The GALEX Ultraviolet Virgo Cluster Survey (GUViCS)^⋆

III. The ultraviolet source catalogs

¹ Aix-Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388 Marseille, France
e-mail: elysse.voyer@oamp.fr, alessandro.boselli@lam.fr; samuel.boissier@lam.fr
² Department of Astronomy, University of Maryland, College Park, MD 20742-2421, USA
³ Centre for Astrophysics & Supercomputing, Swinburne University of Technology, Mail H30, PO Box 218, Hawthorn, VIC 3122, Australia
⁴ European Southern Observatory, Karl Schwarzschild Str. 2, 85748 Garching bei München, Germany
⁵ Herzberg Institute of Astrophysics, National Research Council of Canada, Victoria, BC, V9E 2E7, Canada
⁶ Canada-France-Hawaii Telescope Corporation, Kamuela, HI 96743, USA
⁷ Department of Astronomy, Peking University, 100871 Beijing, PR China
⁸ Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, PR China
⁹ Center for Astronomy and Astrophysics, Department of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shangai, PR China
¹⁰ INPAC, Department of Physics and Astronomy and Shanghai Key Lab for Particle Physics and Cosmology, Shanghai Jiao Tong University, 200240 Shanghai, PR China

Received: 20 August 2013
Accepted: 13 May 2014

Abstract

In this paper we introduce the deepest and most extensive ultraviolet extragalactic source catalogs of the Virgo Cluster area to date. Archival and targeted GALEX imaging is compiled and combined to provide the deepest possible coverage over ~120 deg² in the NUV (λ_eff = 2316 Å) and ~40 deg² in the FUV (λ_eff = 1539 Å) between 180°≤ RA ≤ 195° and 0° ≤ Dec ≤ 20°. We measure the integrated photometry of 1770 extended UV sources of all galaxy types and use GALEX pipeline photometry for 1 230 855 point-like sources in the foreground, within, and behind the cluster. Extended source magnitudes are reliable to m_UV ~ 22, showing a ~0.01σ difference from their asymptotic magnitudes. Point-like source magnitudes have a 1σ standard deviation within ~0.2 mag down to m_uv ~ 23. The point-like source catalog is cross-matched with large optical databases and surveys including the SDSS DR9 (>1 million Virgo Cluster sources), the Next Generation Virgo Cluster Survey (NGVS; >13 million Virgo Cluster sources), and the NED (~30 000 sources in the Virgo Cluster). We find that 69% of the entire UV point-like source catalog has a unique optical counterpart, 11% of which are stars and 0.01% (129) are Virgo cluster members that are neither in the VCC nor part of the bright CGCG galaxy catalog (i.e., m_pg < 14.5). These data are collected in three catalogs containing the UV extended sources, the UV point-like sources, and the most relevant optical parameters of UV-optically matched point-like sources for further studies from SDSS. The GUViCS catalogs provide a unique set of data for future work on UV and multiwavelength studies in the cluster and background environments.