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RXTE Observations of LMC X-1 and LMC X-3 | | J. Wilms
; M. A. Nowak
; J. B. Dove
; K. Pottschmidt
; W. A. Heindl
; M. C. Begelman
; R. Staubert
; | | Date: |
6 Oct 1998 | | Subject: | astro-ph | | Affiliation: | Institute for Astronomy and Astrophysics, Tuebingen, Astronomy, JILA, University of Colorado, CASA, University of Colorado, CASS, University of California at San Diego | | Abstract: | 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 (170ksec) 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 is about 2.5), RXTE detected a significant signal from LMC X-3 up to energies of 50keV, 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 ~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. | | Source: | arXiv, astro-ph/9810077 | | Services: | Forum | Review | PDF | Favorites | |
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