Black hole accretion discs in the canonical low-hard state
dc.contributor.author | Reis, R. C. | en_US |
dc.contributor.author | Fabian, A. C. | en_US |
dc.contributor.author | Miller, J. M. | en_US |
dc.date.accessioned | 2011-01-13T19:52:44Z | |
dc.date.available | 2011-01-13T19:52:44Z | |
dc.date.issued | 2010-02-21 | en_US |
dc.identifier.citation | Reis, R. C.; Fabian, A. C.; Miller, J. M.; (2010). "Black hole accretion discs in the canonical low-hard state." Monthly Notices of the Royal Astronomical Society 402(2): 836-854. <http://hdl.handle.net/2027.42/78691> | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.issn | 1365-2966 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/78691 | |
dc.description.abstract | Stellar mass black holes in the low-hard state may hold clues to jet formation and basic accretion disc physics, but the nature of the accretion flow remains uncertain. A standard thin disc can extend close to the innermost stable circular orbit, but the inner disc may evaporate when the mass accretion rate is reduced. Blackbody-like continuum emission and dynamically broadened iron emission lines provide independent means of probing the radial extent of the inner disc. Here, we present an X-ray study of eight black holes in the low-hard state. A thermal-disc continuum with a colour temperature consistent with L ∝ T 4 is clearly detected in all eight sources, down to ≈5 × 10 −4 L Edd . In six sources, disc models exclude a truncation radius larger than 10 r g . Iron Kα fluorescence line emission is observed in half of the sample, down to luminosities of ≈1.5 × 10 −3 L Edd . Detailed fits to the line profiles exclude a truncated disc in each case. If strong evidence of truncation is defined as (1) a non-detection of a broad iron line and (2) an inner disc temperature much cooler than expected from the L ∝ T 4 relation, none of the spectra in this sample offers strong evidence of disc truncation. This suggests that the inner disc may evaporate at or below ≈1.5 × 10 −3 L Edd . | en_US |
dc.format.extent | 10141401 bytes | |
dc.format.extent | 3106 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.subject.other | Accretion, Accretion Discs | en_US |
dc.title | Black hole accretion discs in the canonical low-hard state | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA | en_US |
dc.contributor.affiliationother | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/78691/1/j.1365-2966.2009.15976.x.pdf | |
dc.identifier.doi | 10.1111/j.1365-2966.2009.15976.x | en_US |
dc.identifier.source | Monthly Notices of the Royal Astronomical Society | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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