Evidence for a black hole in the x-ray transient GRS 1009-45

Aya Kubota; Yasuo Tanaka; Kazuo Makishima; Yoshihiro Ueda; Tadayasu Dotani; Hajime Inoue; Kazutaka Yamaoka

doi:10.1093/pasj/50.6.667

Evidence for a black hole in the x-ray transient GRS 1009-45

Aya Kubota, Yasuo Tanaka, Kazuo Makishima, Yoshihiro Ueda, Tadayasu Dotani, Hajime Inoue, Kazutaka Yamaoka

Research output: Contribution to journal › Article › peer-review

218 Citations (Scopus)

Abstract

We report on the result of an X-ray observation of the X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on 1993 November 10-11. The energy spectrum was extremely soft and accompanied by a hard tail, characteristics of the Galactic black-hole binaries in the soft state. It is well represented by a two-component model consisting of a multicolor disk model or a general relativistic accretion disk model, both describing emission from an optically thick accretion disk, and a power-law component with a photon index of ∼ 2.5. A spectral analysis of the soft component allows an estimation of the mass of the central object. For the optically-estimated distance (> 1 kpc) and inclination (> 37°), the mass is estimated to be > 3.1 M_⊙. These results strongly support that the compact object is a black hole.

Original language	English
Pages (from-to)	667-673
Number of pages	7
Journal	Publications of the Astronomical Society of Japan
Volume	50
Issue number	6
DOIs	https://doi.org/10.1093/pasj/50.6.667
Publication status	Published - 1998
Externally published	Yes

Keywords

Accretion disks
Black hole
X-rays: Binaries
X-rays: Transients

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/pasj/50.6.667

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title = "Evidence for a black hole in the x-ray transient GRS 1009-45",

abstract = "We report on the result of an X-ray observation of the X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on 1993 November 10-11. The energy spectrum was extremely soft and accompanied by a hard tail, characteristics of the Galactic black-hole binaries in the soft state. It is well represented by a two-component model consisting of a multicolor disk model or a general relativistic accretion disk model, both describing emission from an optically thick accretion disk, and a power-law component with a photon index of ∼ 2.5. A spectral analysis of the soft component allows an estimation of the mass of the central object. For the optically-estimated distance (> 1 kpc) and inclination (> 37°), the mass is estimated to be > 3.1 M⊙. These results strongly support that the compact object is a black hole.",

keywords = "Accretion disks, Black hole, X-rays: Binaries, X-rays: Transients",

author = "Aya Kubota and Yasuo Tanaka and Kazuo Makishima and Yoshihiro Ueda and Tadayasu Dotani and Hajime Inoue and Kazutaka Yamaoka",

year = "1998",

doi = "10.1093/pasj/50.6.667",

language = "English",

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T1 - Evidence for a black hole in the x-ray transient GRS 1009-45

AU - Kubota, Aya

AU - Tanaka, Yasuo

AU - Makishima, Kazuo

AU - Ueda, Yoshihiro

AU - Dotani, Tadayasu

AU - Inoue, Hajime

AU - Yamaoka, Kazutaka

PY - 1998

Y1 - 1998

N2 - We report on the result of an X-ray observation of the X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on 1993 November 10-11. The energy spectrum was extremely soft and accompanied by a hard tail, characteristics of the Galactic black-hole binaries in the soft state. It is well represented by a two-component model consisting of a multicolor disk model or a general relativistic accretion disk model, both describing emission from an optically thick accretion disk, and a power-law component with a photon index of ∼ 2.5. A spectral analysis of the soft component allows an estimation of the mass of the central object. For the optically-estimated distance (> 1 kpc) and inclination (> 37°), the mass is estimated to be > 3.1 M⊙. These results strongly support that the compact object is a black hole.

AB - We report on the result of an X-ray observation of the X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on 1993 November 10-11. The energy spectrum was extremely soft and accompanied by a hard tail, characteristics of the Galactic black-hole binaries in the soft state. It is well represented by a two-component model consisting of a multicolor disk model or a general relativistic accretion disk model, both describing emission from an optically thick accretion disk, and a power-law component with a photon index of ∼ 2.5. A spectral analysis of the soft component allows an estimation of the mass of the central object. For the optically-estimated distance (> 1 kpc) and inclination (> 37°), the mass is estimated to be > 3.1 M⊙. These results strongly support that the compact object is a black hole.

KW - Accretion disks

KW - Black hole

KW - X-rays: Binaries

KW - X-rays: Transients

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Evidence for a black hole in the x-ray transient GRS 1009-45

Abstract

Keywords

ASJC Scopus subject areas

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