Is the black hole in GX 339-4 really spinning rapidly?

S. Yamada, K. Makishima, Y. Uehara, K. Nakazawa, H. Takahashi, T. Dotani, Y. Ueda, K. Ebisawa, Aya Kubota, P. Gandhi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The wide-band Suzaku spectra of the black hole (BH) binary GX 339-4, acquired in 2007 February during the Very High state, were reanalyzed. Effects of event pileup (significant within ∼3′ of the image center) and telemetry saturation of the X-ray Imaging Spectrometer (XIS) data were carefully considered. The source was detected up to ∼300keV, with an unabsorbed 0.5-200keV luminosity of 3.8 × 1038ergs-1 at 8kpc. The spectrum can be approximated by a power law of photon index 2.7, with a mild soft excess and a hard X-ray hump. When using the XIS data outside 2′ of the image center, the Fe K line appeared extremely broad, suggesting a high BH spin as already reported by Miller etal. based on the same Suzaku data and other CCD data. When the XIS data accumulation is further limited to >3′ to avoid event pileup, the Fe K profile becomes narrower, and a marginally better solution appears which suggests that the inner disk radius is 5-14 times the gravitational radius (1σ), though a maximally spinning BH is still allowed by the data at the 90% confidence level. Consistently, the optically thick accretion disk is inferred to be truncated at a radius 5-32 times the gravitational radius. Thus, the Suzaku data allow an alternative explanation without invoking a rapidly spinning BH. This inference is further supported by the disk radius measured previously in the High/Soft state.

Original languageEnglish
JournalAstrophysical Journal
Volume707
Issue number2 PART 2
DOIs
Publication statusPublished - 2009

Fingerprint

metal spinning
imaging spectrometers
radii
spectrometer
x rays
K lines
telemetry
inference
accretion disks
confidence
charge coupled devices
luminosity
broadband
saturation
power law
photons
accretion
profiles

Keywords

  • Stars: individual (GX 339-4)
  • X-rays: binaries

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Yamada, S., Makishima, K., Uehara, Y., Nakazawa, K., Takahashi, H., Dotani, T., ... Gandhi, P. (2009). Is the black hole in GX 339-4 really spinning rapidly? Astrophysical Journal, 707(2 PART 2). https://doi.org/10.1088/0004-637X/707/2/L109

Is the black hole in GX 339-4 really spinning rapidly? / Yamada, S.; Makishima, K.; Uehara, Y.; Nakazawa, K.; Takahashi, H.; Dotani, T.; Ueda, Y.; Ebisawa, K.; Kubota, Aya; Gandhi, P.

In: Astrophysical Journal, Vol. 707, No. 2 PART 2, 2009.

Research output: Contribution to journalArticle

Yamada, S, Makishima, K, Uehara, Y, Nakazawa, K, Takahashi, H, Dotani, T, Ueda, Y, Ebisawa, K, Kubota, A & Gandhi, P 2009, 'Is the black hole in GX 339-4 really spinning rapidly?', Astrophysical Journal, vol. 707, no. 2 PART 2. https://doi.org/10.1088/0004-637X/707/2/L109
Yamada S, Makishima K, Uehara Y, Nakazawa K, Takahashi H, Dotani T et al. Is the black hole in GX 339-4 really spinning rapidly? Astrophysical Journal. 2009;707(2 PART 2). https://doi.org/10.1088/0004-637X/707/2/L109
Yamada, S. ; Makishima, K. ; Uehara, Y. ; Nakazawa, K. ; Takahashi, H. ; Dotani, T. ; Ueda, Y. ; Ebisawa, K. ; Kubota, Aya ; Gandhi, P. / Is the black hole in GX 339-4 really spinning rapidly?. In: Astrophysical Journal. 2009 ; Vol. 707, No. 2 PART 2.
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