An Ultrasoft X-ray Flare from 3XMM J152130.7+074916: a Tidal Disruption Event Candidate

Show simple item record

dc.contributor.author Lin, Dacheng
dc.contributor.author Maksym, Peter W.
dc.contributor.author Irwin, Jimmy A.
dc.contributor.author Komossa, S.
dc.contributor.author Webb, Natalie A.
dc.contributor.author Godet, Olivier
dc.contributor.author Barret, Didier
dc.contributor.author Grupe, Dirk
dc.contributor.author Gwyn, Stephen D. J.
dc.date.accessioned 2018-12-05T14:07:53Z
dc.date.available 2018-12-05T14:07:53Z
dc.date.issued 2015-09-20
dc.identifier.citation Lin, D. et al. (2015): An Ultrasoft X-ray Flare from 3XMM J152130.7+074916: a Tidal Disruption Event Candidate. The Astrophysical Journal, 811(1). DOI: 10.1088/0004-637X/811/1/43 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5140
dc.description.abstract We report on the discovery of an ultrasoft X-ray transient source, 3XMM J152130.7+074916. It was serendipitously detected in an XMM-Newton observation on 2000 August 23, and its location is consistent with the center of the galaxy SDSS J152130.72+074916.5 (z = 0.17901 and dL = 866 Mpc). The high-quality X-ray spectrum can be fitted with a thermal disk with an apparent inner disk temperature of 0.17 keV and a rest-frame 0.24–11.8 keV unabsorbed luminosity of ~5 × 1043 erg s−1, subject to a fast-moving warm absorber. Short-term variability was also clearly observed, with the spectrum being softer at lower flux. The source was covered but not detected in a Chandra observation on 2000 April 3, a Swift observation on 2005 September 10, and a second XMM-Newton observation on 2014 January 19, implying a large variability (>260) of the X-ray flux. The optical spectrum of the candidate host galaxy, taken ~11 years after the XMM-Newton detection, shows no sign of nuclear activity. This, combined with its transient and ultrasoft properties, leads us to explain the source as tidal disruption of a star by the supermassive black hole in the galactic center. We attribute the fast-moving warm absorber detected in the first XMM-Newton observation to the super-Eddington outflow associated with the event and the short-term variability to a disk instability that caused fast change of the inner disk radius at a constant mass accretion rate. en_US
dc.format.mimetype application/pdf en_US
dc.subject accretion, accretion disks en_US
dc.subject galaxies: individual (3XMM J152130.7+074916) en_US
dc.subject galaxies: nuclei en_US
dc.subject X-rays: galaxies en_US
dc.title An Ultrasoft X-ray Flare from 3XMM J152130.7+074916: a Tidal Disruption Event Candidate en_US
dc.type text en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


Browse

My Account