The Second Galex Ultraviolet Variability (GUVV-2) Catalog

Abstract

We present the second Galaxy Evolution Explorer (GALEX) Ultraviolet Variability (GUVV-2) Catalog that contains information on 410 newly discovered time-variable sources gained through simultaneous near (NUV 1750-2750A) and far (FUV 1350-1750A) ultraviolet photometric observations. Source variability was determined by comparing the NUV and/or FUV fluxes derived from orbital exposures recorded during a series of multiple observational visits to 169 GALEX fields on the sky. These sources, which were contained within a sky-area of 161 square deg, varied on average by amplitudes of NUV = 0.6 mag and FUV = 0.9 mag during these observations. Of the 114 variable sources in the catalog with previously known identifications, 67 can be categorized as being active galaxies (QSO's, Seyfert 1 or BL Lac objects). The next largest groups of UV variables are RR Lyrae stars, X-ray sources and novae. By using a combination of UV and visible color-color plots we have been able to tentatively identify 36 possible RR Lyrae and/or Delta Scuti type stars, as well as 35 probable AGN's, many of which may be previously unidentified QSO's or blazars. Finally, we show data for 3 particular variable objects: the contact binary system of SDSS J141818.97+525006.7, the eclipsing dwarf nova system of IY UMa and the highly variable unidentified source SDSS J104325.06+563258.1.

Astronomical Journal accepted

References in corpus (13)

• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• The USNO-B Catalog
• The Fifth Data Release of the Sloan Digital Sky Survey
• The On-Orbit Performance of the Galaxy Evolution Explorer
• A Catalog of 1022 Bright Contact Binary Stars
• The short period end of the contact binary period distribution based on the All Sky Automated Survey (ASAS)
• Hubble Space Telescope ultraviolet spectroscopy of blazars: emission lines properties and black hole masses
• Statistical Properties of the GALEX/SDSS matched source catalogs, and classification of the UV sources
• GALEX high time-resolution ultraviolet observations of dMe flare events
• The detection of M-dwarf UV flare events in the GALEX data archives
• The Galex Ultraviolet Variability (GUVV) Catalog
• Large-Amplitude Ultraviolet Variations in the RR Lyrae Star ROTSE-I J143753.84+345924.8
• Discovery of a New Deeply Eclipsing SU UMa-Type Dwarf Nova, IY UMa (= TmzV85)

Cited by in corpus (19)

• Dust-Deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission
• Radio Variability in Seyfert Nuclei
• A search for the hidden population of AM CVn binaries in the Sloan Digital Sky Survey
• gPhoton: The GALEX Photon Data Archive
• The GALEX Time Domain Survey I. Selection and Classification of Over a Thousand UV Variable Sources
• Long-term Photometric Behavior of Outbursting AM CVn Systems
• GALEX observations of quasar variability in the ultraviolet
• HAZMAT II: Ultraviolet Variability of Low-Mass Stars in the GALEX Archive
• The UV Emission of Stars in LAMOST Survey I. Catalogs
• The Timescale-Dependent Color Variability of Quasars Viewed with GALEX
• Detecting Variability in Massive Astronomical Time-Series Data II: Variable Candidates in the Northern Sky Variability Survey
• The Identification of RR Lyrae and Delta Scuti Stars from Variable GALEX Ultraviolet Sources
• Searching for Short-Timescale Variability in the Ultraviolet with the GALEX gPhoton Archive I.: Artifacts and Spurious Periodicities
• A Proper Motions Study of the Globular Cluster M12 (NGC 6218)
• Near-ultraviolet detections of four dwarf nova candidates in the globular cluster 47 Tucanae
• TUVOpipe: a pipeline to search for UV transients with Swift-UVOT
• The Stripped-Star Ultraviolet Magellanic Cloud Survey (SUMS): The UV Photometric Catalog and Stripped Star Candidate Selection
• Spectroscopic and Photometric Observations of Unidentified Ultraviolate Variable Objects in GUVV-2 Catalog
• The Near Ultraviolet Transient Surveyor (NUTS): An ultraviolet telescope to observe variable sources