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- W2099296775 abstract "New high variability extragalactic sources may be identified by comparing the flux of sources seen in the XMM-Newton Slew Survey with detections and upper limits from the ROSAT All Sky Survey. In November 2012, X-ray emission was detected from the galaxy XMMSL1 J061927.1-655311 (a.k.a. 2MASX 06192755-6553079), a factor 140 times higher than an upper limit from 20 years earlier. Both the X-ray and UV flux subsequently fell, over the following year, by factors of 20 and 4 respectively. Optically, the galaxy appears to be a Seyfert I with broad Balmer lines and weak, narrow, low-ionisation emission lines, at a redshift of 0.0729. The X-ray luminosity peaks at Lx ~ 8x10^43 ergs/s with a typical Sy I-like power-law X-ray spectrum of index ~ 2. The flare has either been caused by a tidal disruption event or by an increase in the accretion rate of a persistent AGN." @default.
- W2099296775 created "2016-06-24" @default.
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- W2099296775 date "2014-11-18" @default.
- W2099296775 modified "2023-10-15" @default.
- W2099296775 title "An X-ray and UV flare from the galaxy XMMSL1 J061927.1-655311" @default.
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- W2099296775 doi "https://doi.org/10.1051/0004-6361/201424347" @default.
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