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

研究成果: Article査読

210 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)667-673
ページ数7
ジャーナルPublications of the Astronomical Society of Japan
50
6
DOI
出版ステータスPublished - 1998
外部発表はい

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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