Spectral and Timing Properties of the Black Hole X-ray Binary H 1743-322 in the Low/hard State Studied with Suzaku

Abstract

We report on the results from Suzaku observations of the Galactic black hole X-ray binary H 1743-322 in the low/hard state during its outburst in 2012 October. We appropriately take into account the effects of dust-scattering to accurately analyze the X-ray spectra. The time-averaged spectra in the 1-200 keV band are dominated by a hard power-law component of a photon index of \approx 1.6 with a high-energy cutoff at \approx 60 keV, which is well described with Comptonization of the disk emission by hot corona. We estimate the inner disk radius from the multi-color disk component, and find that it is 1.3-2.3 times larger than the radius in the high/soft state. This suggests that the standard disk was not extended to the innermost stable circular orbit. A reflection component from the disk is detected with R = Ω/2π\approx 0.6 (Ωis the solid angle). We also successfully estimate the stable disk component in a way independent of the time-averaged spectral modeling, by analyzing short-term spectral variability on the \sim 1-sec timescale. A weak low-frequency quasi-periodic oscillation (LF QPO) at 0.1-0.2 Hz is detected, whose frequency is found to correlate with the X-ray luminosity and photon index. This result may be explained by the evolution of the disk truncation radius.

13 pages, 10 figures, accepted for publication in ApJ

References in corpus (6)

• Modelling the behaviour of accretion flows in X-ray binaries
• The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564
• Hard X-ray emission from the Galactic ridge
• Evolution of the 0.01 - 25 Hz power spectral components in Cygnus X-1
• Thermal emission from the stellar-mass black hole binary XTE J1118+480 in the low/hard state
• Observational characteristics of accretion onto black holes

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