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

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

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)449-452
ページ数4
ジャーナルAdvances in Space Research
25
3-4
DOI
出版ステータスPublished - 2000 1 1
外部発表はい

ASJC Scopus subject areas

  • 航空宇宙工学
  • 天文学と天体物理学
  • 地球物理学
  • 大気科学
  • 宇宙惑星科学
  • 地球惑星科学(全般)

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