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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number100
JournalAstrophysical Journal
Volume789
Issue number2
DOIs
Publication statusPublished - 2014 Jul 10

Fingerprint

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

Keywords

  • accretion, accretion disks
  • black hole physics
  • X-rays: binaries
  • X-rays: individual (H1743-322)

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

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.

In: Astrophysical Journal, Vol. 789, No. 2, 100, 10.07.2014.

Research output: Contribution to journalArticle

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. In: Astrophysical Journal. 2014 ; Vol. 789, No. 2.
@article{30db839c6099469b8863269d400b22f6,
title = "Spectral and timing properties of the black hole x-ray binary h1743-322 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 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.",
keywords = "accretion, accretion disks, black hole physics, X-rays: binaries, X-rays: individual (H1743-322)",
author = "M. Shidatsu and Y. Ueda and S. Yamada and C. Done and T. Hori and K. Yamaoka and Aya Kubota and T. Nagayama and Y. Moritani",
year = "2014",
month = "7",
day = "10",
doi = "10.1088/0004-637X/789/2/100",
language = "English",
volume = "789",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Spectral and timing properties of the black hole x-ray binary h1743-322 in the low/hard state studied with Suzaku

AU - Shidatsu, M.

AU - Ueda, Y.

AU - Yamada, S.

AU - Done, C.

AU - Hori, T.

AU - Yamaoka, K.

AU - Kubota, Aya

AU - Nagayama, T.

AU - Moritani, Y.

PY - 2014/7/10

Y1 - 2014/7/10

N2 - 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.

AB - 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.

KW - accretion, accretion disks

KW - black hole physics

KW - X-rays: binaries

KW - X-rays: individual (H1743-322)

UR - http://www.scopus.com/inward/record.url?scp=84903312610&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84903312610&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/789/2/100

DO - 10.1088/0004-637X/789/2/100

M3 - Article

VL - 789

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 100

ER -