ASCA observation of the X-ray transient GRS 1009-45

A. Kubota; Y. Tanaka; K. Makishima; Y. Ueda; H. Inoue; K. Yamaoka; T. Dotani

doi:10.1016/S0273-1177(99)00778-4

ASCA observation of the X-ray transient GRS 1009-45

A. Kubota, Y. Tanaka, K. Makishima, Y. Ueda, H. Inoue, K. Yamaoka, T. Dotani

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

Abstract

We report on the result of the X-ray observation of X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on November 10-11, 1993. 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. Spectral analysis of the soft component allows 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)	449-452
Number of pages	4
Journal	Advances in Space Research
Volume	25
Issue number	3-4
DOIs	https://doi.org/10.1016/S0273-1177(99)00778-4
Publication status	Published - 2000
Externally published	Yes

ASJC Scopus subject areas

Aerospace Engineering
Astronomy and Astrophysics
Geophysics
Atmospheric Science
Space and Planetary Science
Earth and Planetary Sciences(all)

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10.1016/S0273-1177(99)00778-4

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title = "ASCA observation of the X-ray transient GRS 1009-45",

abstract = "We report on the result of the X-ray observation of X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on November 10-11, 1993. 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. Spectral analysis of the soft component allows 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.",

author = "A. Kubota and Y. Tanaka and K. Makishima and Y. Ueda and H. Inoue and K. Yamaoka and T. Dotani",

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language = "English",

volume = "25",

pages = "449--452",

journal = "Advances in Space Research",

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TY - JOUR

T1 - ASCA observation of the X-ray transient GRS 1009-45

AU - Kubota, A.

AU - Tanaka, Y.

AU - Makishima, K.

AU - Ueda, Y.

AU - Inoue, H.

AU - Yamaoka, K.

AU - Dotani, T.

PY - 2000

Y1 - 2000

N2 - We report on the result of the X-ray observation of X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on November 10-11, 1993. 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. Spectral analysis of the soft component allows 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 the X-ray observation of X-ray Nova Velorum 1993 (GRS 1009-45), made with ASCA on November 10-11, 1993. 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. Spectral analysis of the soft component allows 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.

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DO - 10.1016/S0273-1177(99)00778-4

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SP - 449

EP - 452

JO - Advances in Space Research

JF - Advances in Space Research

IS - 3-4

ER -

ASCA observation of the X-ray transient GRS 1009-45

Abstract

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