Accretion flow diagnostics with X-ray spectral timing: the hard state of SWIFT J1753.5-0127

Pablo Cassatella, Phil Uttley, Thomas Maccarone

Research output: Contribution to journalArticle

Abstract

Recent XMM-Newton studies of X-ray variability in the hard states of black hole X-ray binaries (BHXRBs) indicate that the variability is generated in the 'standard' optically thick accretion disc that is responsible for the multi-colour blackbody emission. The variability originates in the disc as mass-accretion fluctuations and propagates through the disc to 'light up' inner disc regions, eventually modulating the power-law emission that is produced relatively centrally. Both the covariance spectra and time-lags that cover the soft bands strongly support this scenario. Here, we present a comparative spectral-timing study of XMM-Newton data from the BHXRB SWIFT J1753.5-0127 in a bright 2009 hard state with that from the significantly fainter 2006 hard state to show for the first time the change in disc spectral-timing properties associated with a global increase in both the accretion rate and the relative contribution of the disc emission to the bolometric luminosity. We show that,
Original languageEnglish
Pages (from-to)2985
JournalMonthly Notices of the Royal Astronomical Society
StatePublished - Dec 2012

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