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Optical variability of the accretion disk around the intermediate-mass black hole ESO 243-49 HLX-1 during the 2012 outburst

Optical variability of the accretion disk around the ...

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dc.contributor.author Webb, Natalie A. pl
dc.contributor.author Godet, Olivier pl
dc.contributor.author Wiersema, Klaas pl
dc.contributor.author Lasota, Jean-Pierre pl
dc.contributor.author Barret, Didier pl
dc.contributor.author Farrell, Sean A. pl
dc.contributor.author Maccarone, Thomas J. pl
dc.contributor.author Servillat, Mathieu pl
dc.date.accessioned 2015-02-23T14:51:43Z
dc.date.available 2015-02-23T14:51:43Z
dc.date.issued 2014 pl
dc.identifier.issn 2041-8205 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/3267
dc.language eng pl
dc.title Optical variability of the accretion disk around the intermediate-mass black hole ESO 243-49 HLX-1 during the 2012 outburst pl
dc.type JournalArticle pl
dc.abstract.other We present dedicated quasi-simultaneous X-ray \textit{(Swift)} and optical (Very Large Telescope, V -, and R -band) observations of the intermediate-mass black hole candidate HLX-1 before and during the 2012 outburst. We show that the V -band magnitudes vary with time, thus proving that a portion of the observed emission originates in the accretion disk. Using the first quiescent optical observations of HLX-1, we show that the stellar population surrounding HLX-1 is fainter than V ~ 25.1 and R ~ 24.2. We show that the optical emission may increase before the X-ray emission consistent with the scenario proposed by Lasota et al. in which the regular outbursts could be related to the passage at periastron of a star circling the intermediate-mass black hole in an eccentric orbit, which triggers mass transfer into a quasi-permanent accretion disk around the black hole. Further, if there is indeed a delay in the X-ray emission we estimate the mass-transfer delivery radius to be ~ 10^{11} cm. pl
dc.description.volume 780 pl
dc.description.number 1 pl
dc.identifier.doi 10.1088/2041-8205/780/1/L9 pl
dc.identifier.eissn 2041-8213 pl
dc.title.journal The Astrophysical Journal Letters pl
dc.language.container eng pl
dc.affiliation Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne pl
dc.subtype Article pl
dc.identifier.articleid L9 pl
dc.rights.original OTHER; otwarte czasopismo; ostateczna wersja wydawcy; po opublikowaniu; 12; pl
.pointsMNiSW [2014 A]: 40

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