Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event

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dc.contributor.author Lin, Dacheng
dc.contributor.author Godet, Olivier
dc.contributor.author Ho, Luis C.
dc.contributor.author Barret, Didier
dc.contributor.author Webb, Natalie A.
dc.contributor.author Irwin, Jimmy A.
dc.date.accessioned 2018-12-05T21:10:47Z
dc.date.available 2018-12-05T21:10:47Z
dc.date.issued 2017-02-24
dc.identifier.citation Lin, D., Godet, O., Ho, L., Barret, D., Webb, N., Irwin, J. (2017): Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event. Monthly Notices of the Royal Astronomical Society, 468 (1). DOI: 10.1093/mnras/stx489 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5148
dc.description.abstract The X-ray source 2XMM J123103.2+110648 was previously found to show pure thermal X-ray spectra and an ∼3.8 h periodicity in three XMM–Newton X-ray observations in 2003– 2005, and the optical spectrum of the host galaxy suggested it as a type 2 active galactic nucleus candidate. We have obtained new X-ray observations of the source, with Swift and Chandra in 2013–2016, in order to shed new light on its nature based on its long-term evolution property. We found that the source could be in an X-ray outburst, with the X-ray flux decreasing by an order of magnitude in the Swift and Chandra observations, compared with the XMM–Newton observations 10 yr ago. There seemed to be significant spectral softening associated with the drop of X-ray flux (disc temperature kT ∼ 0.16–0.2 keV in XMM–Newton observations versus kT ∼ 0.09 ± 0.02 keV in the Chandra observation). Therefore, the Swift and Chandra followup observations support our previous suggestion that the source could be a tidal disruption event (TDE), though it seems to evolve slower than most of the other TDE candidates. The apparent long duration of this event could be due to the presence of a long super-Eddington accretion phase and/or slow circularization. en_US
dc.format.mimetype application/pdf en_US
dc.subject accretion, accretion discs en_US
dc.subject black hole physics en_US
dc.subject galaxies: individual: 2XMM J123103.2+110648 en_US
dc.subject X-rays: galaxies en_US
dc.title Large Decay of X-ray Flux in 2XMM J123103.2+110648: Evidence for a Tidal Disruption Event en_US
dc.type text en_US


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