ar X iv : a st ro - p h / 98 10 07 7 v 1 6 O ct 1 99 8 RXTE Observations of LMC X - 1 and LMC X - 3
نویسندگان
چکیده
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 (Γ ∼ 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 ∼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.
منابع مشابه
ar X iv : a st ro - p h / 99 10 50 8 v 1 2 8 O ct 1 99 9 RXTE Monitoring of LMC X - 3 : Recurrent Hard States
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متن کاملar X iv : a st ro - p h / 98 12 35 8 v 1 1 8 D ec 1 99 8 RXTE OBSERVATIONS OF LMC X - 1
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