A 2 hour quasi period in an ultraluminous X-ray source in NGC 628

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dc.contributor.authorLiu, JF
dc.contributor.authorBregman, JN
dc.contributor.authorLloyd-Davies, E
dc.contributor.authorIrwin, J
dc.contributor.authorEspaillat, C
dc.contributor.authorSeitzer, P
dc.contributor.otherUniversity of Michigan System
dc.contributor.otherUniversity of Michigan
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2018-09-14T14:59:18Z
dc.date.available2018-09-14T14:59:18Z
dc.date.issued2005-03-01
dc.description.abstractQuasi-periodic oscillations and X-ray spectroscopy are powerful probes of black hole masses and accretion disks, and here we apply these diagnostics to an ultraluminous X-ray source (ULX) in the spiral galaxy NGC 628 (M74). This object was observed four times over 2 years with the Chandra X-Ray Observatory and XMM-Newton, with three long observations showing dramatic variability, distinguished by a series of outbursts with a quasi period of 4000-7000 s. This is unique behavior among ULXs and Galactic X-ray binaries because of the combination of its burstlike peaks and deep troughs, its long quasi periods, its high variation amplitudes of >90%, and its substantial variability between observations. The X-ray spectra is fitted by an absorbed accretion disk plus a power-law component, suggesting the ULX was in a spectral state analogous to the low/hard state or the very high state of Galactic black hole X-ray binaries. A black hole mass of similar to(2-20) x 10(3) M-circle dot is estimated from the f(b)-M-circle scaling relation found in the Galactic X- ray binaries and active galactic nuclei.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationLiu, J., et al. (2005): A 2 Hour Quasi Period in an Ultraluminous X-Ray Source in NGC 628. The Astrophysical Journal, 621(1). DOI: 10.1086/428902
dc.identifier.doi10.1086/428902
dc.identifier.orcidhttps://orcid.org/0000-0001-6276-9526
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3859
dc.languageEnglish
dc.language.isoen_US
dc.publisherIOP Publishing
dc.subjectgalaxies : individual (NGC 628)
dc.subjectX-rays : binaries
dc.subjectBLACK-HOLES
dc.subjectCHANDRA
dc.subjectOBJECT
dc.subjectAstronomy & Astrophysics
dc.titleA 2 hour quasi period in an ultraluminous X-ray source in NGC 628en_US
dc.typetext
dc.typeArticle

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