Near-simultaneous ROSAT and GINGA observations of the 1991 X-ray transient in Musca

Details Near-simultaneous ROSAT and GINGA observations of the 1991 X-ray transient in Musca Near-simultaneous ROSAT and GINGA observations of the 1991 X-ray transient in Musca

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..509g&link_type=abstract

Astronomy and Astrophysics 285, 509-523 (1994)

Astronomy and Astrophysics

Astrophysics

23

X-Rays: Stars, Black Holes, Binaries: Close, Accretion Disks

Scientific paper

During its All-Sky-Survey ROSAT has observed the Musca 1991 X-ray transient on January 24/25, two weeks after outburst, for about 170s. The intensity was found to be nearly 6 Crab in the ROSAT band. A combined fit of ROSAT and Ginga data from 1991 January 25 with a multitemperature disk blackbody model plus a power law component results in a maximal temperature of the disk of about kT = 0.96 keV at an absorbing column of N_H_ = 2.2 x 10^21^ cm^-2^. With the knowledge of the mass function f(M) = 3.1 Msun_ from optical observations we derive a minimum distance to the black hole binary of at least 4-5 kpc. Including the accretion disk inclination angle of i = 26 deg +/- 25 deg determined from the shape of the positron annihilation line, and the quiescent optical brightness together with the most probable spectral type of the companion we derive a black hole mass of M = (6+/-1.5) Msun_and a distance of about (11+/-3) kpc. Additional ROSAT observations in August 1991 and March 1992 suggest that the exponential intensity decay until 240 days after the outburst is followed by a steeper decline between days 240 and 410.

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