Multiwavelength follow-up observations of the tidal disruption event candidate 2XMMi J184725.1-631724

dc.contributor.authorLin, Dacheng
dc.contributor.authorStrader, Jay
dc.contributor.authorCarrasco, Eleazar R.
dc.contributor.authorGodet, Olivier
dc.contributor.authorGrupe, Dirk
dc.contributor.authorWebb, Natalie A.
dc.contributor.authorBarret, Didier
dc.contributor.authorIrwin, Jimmy A.
dc.contributor.otherUniversity System Of New Hampshire
dc.contributor.otherUniversity of New Hampshire
dc.contributor.otherMichigan State University
dc.contributor.otherCentre National de la Recherche Scientifique (CNRS)
dc.contributor.otherUniversite de Toulouse
dc.contributor.otherUniversite Toulouse III - Paul Sabatier
dc.contributor.otherMorehead State University
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherSeoul National University (SNU)
dc.date.accessioned2018-12-05T21:07:13Z
dc.date.available2018-12-05T21:07:13Z
dc.date.issued2017-11-16
dc.description.abstractThe 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 x 10(43) 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 similar to 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.format.mimetypeapplication/pdf
dc.identifier.citationLin, 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
dc.identifier.doi10.1093/mnras/stx2940
dc.identifier.orcidhttps://orcid.org/0000-0001-5683-5339
dc.identifier.orcidhttps://orcid.org/0000-0002-7272-9234
dc.identifier.orcidhttps://orcid.org/0000-0002-0393-9190
dc.identifier.urihttp://ir.ua.edu/handle/123456789/5147
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.subjectaccretion, accretion discs
dc.subjectblack hole physics
dc.subjectgalaxies: individual: 2XMMi J184725.1-631724
dc.subjectX-rays: galaxies
dc.subjectX-RAY SOURCES
dc.subjectSUPERMASSIVE BLACK-HOLES
dc.subjectPHOTON IMAGING CAMERA
dc.subjectSTAR-FORMATION RATE
dc.subjectXMM-NEWTON
dc.subjectPARAMETER-ESTIMATION
dc.subjectCALIBRATION
dc.subjectCHANDRA
dc.subjectFLARE
dc.subjectLUMINOSITY
dc.subjectAstronomy & Astrophysics
dc.titleMultiwavelength follow-up observations of the tidal disruption event candidate 2XMMi J184725.1-631724en_US
dc.typetext
dc.typeArticle
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