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dc.contributor.authorBurke, M.J.
dc.contributor.authorKraft, R.P.
dc.contributor.authorSoria, R.
dc.contributor.authorMaccarone, T. J.
dc.contributor.authorRaychaudhury, S.
dc.contributor.authorSivakoff, G.R.
dc.contributor.authorBirkinshaw, M.
dc.contributor.authorBrassington, Nicola
dc.contributor.authorForman, W.R.
dc.contributor.authorHardcastle, M.J.
dc.contributor.authorJones, C.
dc.contributor.authorMurray, S.S.
dc.contributor.authorWorrall, D.M.
dc.date.accessioned2014-01-13T10:00:40Z
dc.date.available2014-01-13T10:00:40Z
dc.date.issued2013-09-20
dc.identifier.citationBurke , M J , Kraft , R P , Soria , R , Maccarone , T J , Raychaudhury , S , Sivakoff , G R , Birkinshaw , M , Brassington , N , Forman , W R , Hardcastle , M J , Jones , C , Murray , S S & Worrall , D M 2013 , ' The fading of two transient ultraluminous x-ray sources to below the stellar mass Eddington limit ' , The Astrophysical Journal , vol. 775 , no. 1 , 21 . https://doi.org/10.1088/0004-637X/775/1/21
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 2673029
dc.identifier.otherPURE UUID: d3a346db-3232-4819-8f49-b5d9cb4c79d3
dc.identifier.otherScopus: 84884134729
dc.identifier.urihttp://hdl.handle.net/2299/12520
dc.description.abstractWe report new detections of the two transient ultraluminous X-ray sources (ULXs) in NGC 5128 from an ongoing series of Chandra observations. Both sources have previously been observed L (2-3) × ∼10 erg s, at the lower end of the ULX luminosity range. The new observations allow us to study these sources in the luminosity regime frequented by the Galactic black hole X-ray binaries (BH XBs). We present the recent lightcurves of both ULXs. 1RXH J132519.8-430312 (ULX1) was observed at L 1 × 10 erg s, while CXOU J132518.2-430304 (ULX2) declined to L 2 × 10 erg s and then lingered at this luminosity for hundreds of days. We show that a reasonable upper limit for both duty cycles is 0.2, with a lower limit of 0.12 for ULX2. This duty cycle is larger than anticipated for transient ULXs in old stellar populations. By fitting simple spectral models in an observation with ∼50 counts we recover properties consistent with Galactic BH XBs, but inconclusive as to the spectral state. We utilize quantile analyses to demonstrate that the spectra are generally soft, and that in one observation the spectrum of ULX2 is inconsistent with a canonical hard state at >95% confidence. This is contrary to what would be expected of an accreting intermediate mass black hole primary, which we would expect to be in the hard state at these luminosities. We discuss the paucity of transient ULXs discovered in early-type galaxies and excogitate explanations. We suggest that the number of transient ULXs scales with the giant and sub-giant populations, rather than the total number of XBs.en
dc.format.extent9
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.titleThe fading of two transient ultraluminous x-ray sources to below the stellar mass Eddington limiten
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/775/1/21
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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