Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hxra.conf...98w&link_type=abstract
Highlights in x-ray astronomy : international symposium in honour of Joachim Trümper's 65th birthday, June 17-19, 1998, Garching
Astronomy and Astrophysics
Astronomy
2
Black Holes (Astronomy), X Ray Astronomy, X Ray Spectra, X Ray Timing Explorer, Proportional Counters, Black Body Radiation, Magellanic Clouds
Scientific paper
Of all known persistent stellar-mass black hole candidates, only LMC X-1 and LMC X-3 consistently show spectra that are dominated by a soft, thermal component. We present results from long (170 ksec) Rossi X-ray Timing Explorer (RXTE) observations of LMC X-1 and LMC X-3 made in 1996 December. The spectra can be described by a multicolor disk blackbody plus an additional high-energy power-law. Even though the spectra are very soft (Gamma approximately 2.5), RXTE detected a significant signal from LMC X-3 up to energies of 50 keV, the hardest energy at which the object was ever detected. Focusing on LMC X-3 , we present results from the first year of an ongoing monitoring campaign with RXTE which started in 1997 January. We show that the appearance of the object changes considerably over its approximately 200 d long cycle. This variability can either be explained by periodic changes in the mass transfer rate or by a precessing accretion disk analogous to Her X-1.
Begelman Mitchell C.
Dove James B.
Heindl William A.
Nowak Maciej A.
Pottschmidt Katja
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