2009/11/18 by Mark Reynolds, M. T. Reynolds, Jon Miller +5 · 1 citation
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Black hole (networking) #Broadband #Flux (metallurgy) #Gamma-ray bursts and supernovae #Line (geometry) #Optics #Physics #Pulsars and Gravitational Waves Research #RADIUS #Spectral line #Spectroscopy #astro-ph.HE
paper · pdf · doi:10.1088/0004-637x/709/1/358
published as Astrophys.J.709:358-368,2010 · 12 pages, 7 figures, formatted using emulateapj.cls. Accepted for publication in ApJ
arxiv created 2009/11/18 · openalex publication_date 2009/12/31 · arxiv updated 2014/11/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 ≲ 6 R g , 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 ∼ 10–50 R 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 in ∼ 10–20 R g ). The implications of these observations for models of the accretion flow in the LHS are discussed.