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Multistate observations of the galactic black hole XTE J1752−223 : evidence for an intermediate black hole spin
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Reis, R. C., Miller, J. M., Fabian, A. C., Cackett, E. M., Maitra, D., Reynolds, C. S., Rupen, M., Steeghs, D. and Wijnands, R. (2010) Multistate observations of the galactic black hole XTE J1752−223 : evidence for an intermediate black hole spin. Monthly Notices of the Royal Astronomical Society, Vol.410 (No.4). pp. 2497-2505. doi:10.1111/j.1365-2966.2010.17628.x
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WRAP_Steeghs_19_1009.1154v1.pdf - Accepted Version Download (993Kb) | Preview |
Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.17628.x
Abstract
The Galactic black hole candidate XTE J1752-223 was observed during the decay of its 2009 outburst with the Suzaku and XMM-Newton observatories. The observed spectra are consistent with the source being in the 'intermediate' and 'low-hard' states, respectively. The presence of a strong, relativistic iron emission line is clearly detected in both observations and the line profiles are found to be remarkably consistent and robust to a variety of continuum models. This strongly points to the compact object in XTE J1752-223 being a stellar mass black hole accretor and not a neutron star. Physically motivated and self-consistent reflection models for the Fe K alpha emission-line profile and disc reflection spectrum rule out either a non-rotating, Schwarzschild black hole or a maximally rotating, Kerr black hole at greater than 3 sigma level of confidence. Using a fully relativistic line function in which the black hole spin parameter is a variable, we have formally constrained the spin parameter to be 0.52 +/- 0.11(1 sigma). Furthermore, we show that the source in the low-hard state still requires an optically thick disc component having a luminosity which is consistent with the L proportional to T(4) relation expected for a thin disc extending down to the innermost stable circular orbit. Our result is in contrast to the prevailing paradigm that the disc is truncated in the low-hard state.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Black holes (Astronomy) | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 2010 | ||||
| Dates: |
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| Volume: | Vol.410 | ||||
| Number: | No.4 | ||||
| Page Range: | pp. 2497-2505 | ||||
| DOI: | 10.1111/j.1365-2966.2010.17628.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Royal Society (Great Britain), United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF) | ||||
| Grant number: | AST 06-07428 (NSF) |
Data sourced from Thomson Reuters' Web of Knowledge
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