a GALEX Ultraviolet Virgo Cluster Survey







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Presentation of the survey

These pages present the UV observations made with the GALEX telescope (in both of its filters: FUV 1539 A and NUV 2316 A) of the whole Virgo cluster. The data were obtained as part of the mission surveys on one hand, during GI open time proposals, and especially during a cycle 6 proposal that will extend the coverage to the whole area of the cluster with 81 new pointings, for a total of 121.5 ksec to ~ 120 sq. deg. This G6 proposal has been designed for the largest possible overlapping with other ongoing multifrequencies surveys, the optical NGVS survey (Next Generation Virgo Cluster Survey) , the infrared HeVICS project (The Herschel Virgo Infrared Cluster Survey) and the HI blind survey ALFALFA (Arecibo Legacy Fast ALFA survey).

The UV observations are of paramount importance for a large number of studies. In Star Forming galaxies, the present day star formation activity can be measured from the UV flux emitted by the youngest stellar population (Kennicutt 1998), provided that dust extinction can be accurately determined (e.g. using the far-IR to UV flux ratio, Cortese et al. 2008). In quiescent galaxies, the level emission can help to date the last generation of stars (on a few 100 Myr timescale) or be related to very old populations (UV upturn).