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An X-ray and UV flare from the galaxy XMMSL1 J061927.1-655311


Saxton, RD and Read, AM and Komossa, S and Rodriguez-Pascual, P and Miniutti, G and Dobbie, P and Esquej, P and Colless, M and Bannister, KW, An X-ray and UV flare from the galaxy XMMSL1 J061927.1-655311, Astronomy and Astrophysics, 572 Article A1. ISSN 0004-6361 (2014) [Refereed Article]


Copyright Statement

Copyright 2014 Astronomy & Astrophysics

DOI: doi:10.1051/0004-6361/201424347


Aims: 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.

Methods: A detected flaring extragalactic source was monitored with Swift and XMM-Newton to track its temporal and spectral evolution. Optical and radio observations were made to help classify the galaxy, investigate the reaction of circumnuclear material to the X-ray flare, and check for the presence of a jet.

Results: 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 ~ 8  1043 erg s-1 with a typical Sy I-like power-law X-ray spectrum of Γ ~ 2. The flare has either been caused by a tidal disruption event or by an increase in the accretion rate of a persistent active galactic nucleus.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active, galaxies: individual: XMMSL1 J061927.1-655311, X-rays: galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, P (Dr Paul Dobbie)
ID Code:98792
Year Published:2014
Web of Science® Times Cited:17
Deposited By:Mathematics and Physics
Deposited On:2015-03-03
Last Modified:2015-04-27
Downloads:545 View Download Statistics

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