SUZAKU BROADBAND SPECTROSCOPY OF SWIFT J1753.5–0127 IN THE LOW-HARD STATE
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Author(s)
Reynolds, Mark T.
Miller, Jon M.
Homan, Jeroen
Miniutti, Giovanni
Date Issued
December 2009
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Reynolds, Mark T., Jon M. Miller, Jeroen Homan, and Giovanni Miniutti. “ SUZAKU BROADBAND SPECTROSCOPY OF SWIFT J1753.5–0127 IN THE LOW-HARD STATE .” The Astrophysical Journal 709, no. 1 (December 31, 2009): 358–368. © 2010 The American Astronomical Society
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Final published version
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 [subscript in] [< over ~] 6R[subscript g] , for certain values of, e.g., N [subscript H], i), although we cannot conclusively rule out the presence of an accretion disk truncated at larger radii (R [subscript in] ~ 10-50R[subscript g] ). 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 [subscript in] ~ 10-20R[subscript g] ). The implications of these observations for models of the accretion flow in the LHS are discussed.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/709/1/358
