Spectral and timing properties of the black hole x-ray binary h1743-322 in the low/hard state studied with Suzaku

M. Shidatsu, Y. Ueda, S. Yamada, C. Done, T. Hori, K. Yamaoka, Aya Kubota, T. Nagayama, Y. Moritani

研究成果: Article

17 引用 (Scopus)

抄録

We report on the results from Suzaku observations of the Galactic black hole X-ray binary H1743-322 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 ≈1.6 with a high-energy cutoff at ≈60 keV, which is well described with the Comptonization of the disk emission by the 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 ≈ 0.6 (Ω is the solid angle). We also successfully estimate the stable disk component independent of the time-averaged spectral modeling by analyzing short-term spectral variability on a ∼1 s timescale. A weak low-frequency quasi-periodic oscillation 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.

元の言語English
記事番号100
ジャーナルAstrophysical Journal
789
発行部数2
DOI
出版物ステータスPublished - 2014 7 10

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x ray binaries
time measurement
outburst
corona
power law
radii
oscillation
scattering
dust
timescale
x rays
circular orbits
photons
modeling
estimates
energy
coronas
cut-off
luminosity
low frequencies

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

これを引用

Spectral and timing properties of the black hole x-ray binary h1743-322 in the low/hard state studied with Suzaku. / Shidatsu, M.; Ueda, Y.; Yamada, S.; Done, C.; Hori, T.; Yamaoka, K.; Kubota, Aya; Nagayama, T.; Moritani, Y.

:: Astrophysical Journal, 巻 789, 番号 2, 100, 10.07.2014.

研究成果: Article

Shidatsu, M, Ueda, Y, Yamada, S, Done, C, Hori, T, Yamaoka, K, Kubota, A, Nagayama, T & Moritani, Y 2014, 'Spectral and timing properties of the black hole x-ray binary h1743-322 in the low/hard state studied with Suzaku', Astrophysical Journal, 巻. 789, 番号 2, 100. https://doi.org/10.1088/0004-637X/789/2/100
Shidatsu, M. ; Ueda, Y. ; Yamada, S. ; Done, C. ; Hori, T. ; Yamaoka, K. ; Kubota, Aya ; Nagayama, T. ; Moritani, Y. / Spectral and timing properties of the black hole x-ray binary h1743-322 in the low/hard state studied with Suzaku. :: Astrophysical Journal. 2014 ; 巻 789, 番号 2.
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AU - Done, C.

AU - Hori, T.

AU - Yamaoka, K.

AU - Kubota, Aya

AU - Nagayama, T.

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