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000620266 0247_ $$2arXiv$$aarXiv:2405.14269
000620266 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-00100
000620266 037__ $$aPUBDB-2025-00100
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000620266 088__ $$2arXiv$$aarXiv:2405.14269
000620266 1001_ $$0P:(DE-H253)PIP1018733$$aBühler, Rolf$$b0$$eCorresponding author$$udesy
000620266 245__ $$aThe time-variable ultraviolet sky: Active galactic nuclei, stars, and white dwarfs
000620266 260__ $$c2024
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000620266 500__ $$aA&A 687, A313 (2024). Accepted for publication in Astronomy and Astrophysics. The 1UVA catalog will be made available via the Strasbourg astronomical Data Center (CDS). The article has 13 pages and contains 11 figures
000620266 520__ $$aHere, we present the first catalog of Ultraviolet time-VAriable sources (1UVA). We describe a new analysis pipeline called VAriable Source Clustering Analysis (VASCA). We applied this pipeline to 10 yr of data from the Galaxy Evolution Explorer (GALEX) satellite. We analyzed a sky area 302 deg2, and detected 4,202 time-variable ultraviolet (UV) sources. We cross-correlated these sources with multi-frequency data from the Gaia satellite and the Set of Identifications, Measurements and Bibliography for Astronomical Data (SIMBAD) database, finding an association for 3,655 sources. The source sample was dominated by active galactic nuclei (≈73%) and stars (≈24%). We examined the UV and multi-frequency properties of these sources, focusing on the stellar population. We found UV variability for four white dwarfs (WDs). One of them, WD J004917.14–252556.81, was recently found to be the most massive pulsating WD. Its spectral energy distribution shows no sign of a stellar companion. The observed flux variability was unexpected and difficult to explain.Key words: catalogs / surveys / Hertzsprung-Russell and C-M diagrams / white dwarfs / quasars: general★ The catalog is available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A313
000620266 536__ $$0G:(DE-HGF)POF4-613$$a613 - Matter and Radiation from the Universe (POF4-613)$$cPOF4-613$$fPOF IV$$x0
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000620266 693__ $$0EXP:(DE-H253)CTA-20150101$$5EXP:(DE-H253)CTA-20150101$$eCherenkov Telescope Array$$x0
000620266 7001_ $$0P:(DE-H253)PIP1091245$$aSchliwinski, Julian$$b1
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000620266 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1018733$$aDeutsches Elektronen-Synchrotron$$b0$$kDESY
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000620266 9141_ $$y2024
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