Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9962746w&link_type=abstract
Technical Report, Tuebingen Univ. Germany Institut für Astronomie und Astrophysik
Astronomy and Astrophysics
Astronomy
Accretion Disks, Black Holes (Astronomy), X Ray Astronomy, Spectrum Analysis, X Ray Timing Explorer, Ginga Satellite, Spectra
Scientific paper
LMC X-1 and LMC X-3 are the only two black holes that are consistently seen in the soft X-ray state. We present the results from the spectral and temporal analysis of a long (150 ksec) observation of these two objects. The spectra can be well described by a disk black body plus a high energy power-law, which extends to at least 50keV. Starting in December 1996 we have also monitored these objects with RXTE in about three to four week intervals. We present the evolution of the spectral parameters of the sources from the first twenty pointings. LMC X-1 has a very stable spectrum and does not exhibit any large scale variability. On the other hand, the appearance of LMC X-3 changes considerably over its 200d 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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