Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..667k&link_type=abstract
Publications of the Astronomical Society of Japan, v.50, p.667-673.
Astronomy and Astrophysics
Astronomy
82
Accretion Disks, Black Hole, X-Rays: Binaries, X-Rays: Transients
Scientific paper
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. %The former component describes emission from an optically-thick accretion disk, with a color temperature of 0.49 keV at the inner disk boundary. A spectral analysis of the soft component %multicolor disk component allows an estimation of %the inner radius of the accretion disk which is thought to be proportional to the mass of the central object. For the optically-estimated distance (>1 kpc) and inclination (>37(deg) ), the mass is estimated to be >3.1 MO . These results strongly support that the compact object is a black hole.
Dotani Tadayasu
Inoue Hajime
Kubota Aya
Makishima Kazuo.
Tanaka Yasuo
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