Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724

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dc.contributor.author Lin, Dacheng
dc.contributor.author Strader, Jay
dc.contributor.author Carrasco, Eleazar R.
dc.contributor.author Godet, Olivier
dc.contributor.author Grupe, Dirk
dc.contributor.author Webb, Natalie A.
dc.contributor.author Barret, Didier
dc.contributor.author Irwin, Jimmy A.
dc.date.accessioned 2018-12-05T21:07:13Z
dc.date.available 2018-12-05T21:07:13Z
dc.date.issued 2017-11-16
dc.identifier.citation Lin, D., Strader, J., Carrasco, E., Godet, O., Grupe, D., Webb, N., Barret, D., Irwin, J. (2017): Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724. Monthly Notices of the Royal Astronomical Society, 474 (3). DOI: 10.1093/mnras/stx2940 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5147
dc.description.abstract The ultrasoft X-ray flare 2XMMi J184725.1−631724 was serendipitously detected in two XMM–Newton observations in 2006 and 2007, with a peak luminosity of 6 × 1043 erg s−1. It was suggested to be a tidal disruption event (TDE) because its position is consistent with the centre of an inactive galaxy. It is the only known X-ray TDE candidate whose X-ray spectra showed evidence of a weak steep power-law component besides a dominant supersoft thermal disc. We have carried out multiwavelength follow-up observations of the event. Multiple X-ray monitorings show that the X-ray luminosity has decayed significantly after 2011. Especially, in our deep Chandra observation in 2013, we detected a very faint counterpart that supports the nuclear origin of 2XMMi J184725.1−631724 but had an X-ray flux a factor of ∼1000 lower than in the peak of the event. Compared with follow-up ultraviolet (UV) observations, we found that there might be some enhanced UV emission associated with the TDE in the first XMM–Newton observation. We also obtained a high-quality UV-optical spectrum with the Southern Astrophysical Research (SOAR) Telescope and put a very tight constraint on the persistent nuclear activity, with a persistent X-ray luminosity expected to be lower than the peak of the flare by a factor of >2700. Therefore, our multiwavelength follow-up observations strongly support the TDE explanation of the event. en_US
dc.description.uri https://academic.oup.com/mnras/article/474/3/3000/4636554
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: 2XMMi J184725.1−631724 en_US
dc.subject galaxies: individual: 2XMMi J184725.1-631724 en_US
dc.subject X-rays: galaxies en_US
dc.title Multiwavelength Follow-up Observations of the Tidal Disruption Event Candidate 2XMMi J184725.1-631724 en_US
dc.type text en_US


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