Galex-SDSS catalogs for statistical studies

Tams Budavri, Sébastien Heinis, Alexander S. Szalay, María Nieto-Santisteban, Jayant Gupchup, Bernie Shiao, Myron Smith, Ruixiang Chang, Guinevere Kauffmann, Patrick Morrissey, David Schiminovich, Bruno Milliard, Ted K. Wyder, D. Christopher Martin, Tom A. Barlow, Mark Seibert, Karl Forster, Luciana Bianchi, Jose Donas, Peter G. FriedmanTimothy M. Heckman, Young Wook Lee, Barry F. Madore, Susan G. Neff, R. Michael Rich, Barry Y. Welsh

Research output: Contribution to journalArticlepeer-review


We present a detailed study of the Galaxy Evolution Explorer's (GALEX) photometric catalogs with special focus on the statistical properties of the All-sky and Medium Imaging Surveys. We introduce the concept of primaries to resolve the issue of multiple detections and follow a geometric approach to define clean catalogs with well understood selection functions. We cross-identify the GALEX sources (GR2+3) with Sloan Digital Sky Survey (SDSS; DR6) observations, which indirectly provides an invaluable insight into the astrometric model of the UV sources and allows us to revise the band merging strategy. We derive the formal description of the GALEX footprints as well as their intersections with the SDSS coverage along with analytic calculations of their areal coverage. The crossmatch catalogs are made available for the public. We conclude by illustrating the implementation of typical selection criteria in SQL for catalog subsets geared toward statistical analyses, e.g., correlation and luminosity function studies.

Original languageEnglish (US)
Pages (from-to)1281-1292
Number of pages12
JournalAstrophysical Journal
Issue number2
StatePublished - 2009


  • Catalogs
  • Methods: statistical
  • Surveys
  • Ultraviolet: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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