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 - 2000/1/1
Y1 - 2000/1/1
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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U2 - 10.1016/S0273-1177(99)00778-4
DO - 10.1016/S0273-1177(99)00778-4
M3 - Article
AN - SCOPUS:0040358753
VL - 25
SP - 449
EP - 452
JO - Life sciences and space research
JF - Life sciences and space research
SN - 0273-1177
IS - 3-4
ER -