GALEX catalogs of UV sources: statistical properties and sample science applications: hot white dwarfs in the Milky Way |
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| Authors: | L Bianchi J Herald B Efremova L Girardi A Zabot P Marigo A Conti B Shiao |
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| Institution: | 1.Department of Physics & Astronomy,Johns Hopkins University,Baltimore,USA;2.INAF-Padua Observatory,Padua,Italy;3.Universidade Federal da Fronteira Sul,Santa Catarina,Brazil;4.Department of Astronomy,Padua University,Padua,Italy;5.Space Telescope Science Institute,Baltimore,USA |
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| Abstract: | We describe the content and properties of UV source catalogs from GALEX’s All-Sky Imaging Survey (AIS, 5σ depth ≈19.9(FUV)/20.8(NUV) mag, in the AB system) and Medium-depth Imaging Survey (MIS, 5σ depth ≈22.6(FUV)/22.7(NUV) mag), constructed by Bianchi L., et al.: Mon. Not. R. Astron. Soc. (2010, in press). The catalogs contain 65.3/12.6 million (AIS/MIS) unique UV sources with photometric error in NUV less than 0.5 mag, over 21?435(AIS)/1579(MIS) square degrees. Matched optical data from GSC-II provide additional B, R, I photometry for the brightest sources, and SDSS provides u g r i z photometry over 7325(AIS)/1103(MIS) square degrees overlap areas. We discuss statistical properties that are relevant for understanding sample selection biases and completeness, in potential science applications of these catalogs. The FUV (1344–1786 Å) and NUV (1771–2831 Å) photometry uniquely enable selection of the hottest stellar objects, in particular hot white dwarfs (WD), which are elusive at optical wavelengths because of their hot temperatures and faint luminosities. From the GALEX-SDSS matched sources we selected ～40?000 Milky Way (MW) stars hotter than about 18?000 K (FUV-NUV?
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