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Title:
Suzaku Broadband Spectroscopy of Swift J1753.5–0127 in the Low-Hard State
Authors:
Reynolds, Mark T.; Miller, Jon M.; Homan, Jeroen; Miniutti, Giovanni
Affiliation:
AA(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AB(Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA ), AC(MIT Kavli Institute for Astrophysics and Space Research, 70 Vasser Street, Cambridge, MA 02139, USA ), AD(LAEX, Centro de Astrobiologia (CSIC-INTA); LAEFF, P.O. Box 78, E-28691, Villanueva de la Cañada, Madrid, Spain)
Publication:
The Astrophysical Journal, Volume 709, Issue 1, pp. 358-368 (2010). (ApJ Homepage)
Publication Date:
01/2010
Origin:
IOP
ApJ Keywords:
accretion, accretion disks, black hole physics, X-rays: binaries, X-rays: individual: Swift J1753.5–1027
DOI:
10.1088/0004-637X/709/1/358
Bibliographic Code:
2010ApJ...709..358R

Abstract

We present Suzaku observations of the Galactic black hole candidate Swift J1753.5–0127 in the low-hard state (LHS). The broadband coverage of Suzaku enables us to detect the source over the energy range 0.6-250 keV. The broadband spectrum (2-250 keV) is found to be consistent with a simple power-law (Γ ~ 1.63). In agreement with previous observations of this system, a significant excess of soft X-ray flux is detected consistent with the presence of a cool accretion disk. Estimates of the disk inner radius infer a value consistent with the innermost stable circular orbit (ISCO; R in lsim 6Rg , for certain values of, e.g., N H, i), although we cannot conclusively rule out the presence of an accretion disk truncated at larger radii (R in ~ 10-50Rg ). A weak, relativistically broadened iron line is also detected, in addition to disk reflection at higher energy. However, the iron-K line profile favors an inner radius larger than the ISCO (R in ~ 10-20Rg ). The implications of these observations for models of the accretion flow in the LHS are discussed.
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