Broad-band X-ray spectra of the persistent black hole candidates LMC X-1 and LMC X-3

Abstract

We report on observations of the two persistent black hole candidates LMC X-3 and LMCX-1 performed with \BS in October 1997. The flux of LMC X-1 was possibly measured up to 60 keV, but there is a possible confusion with PSR 0540-69. Fits with an absorbed multicolor disk black body are not satisfactory, while the superposition of this model with a power law is acceptable. The sources showed little variations during the observations. However in LMC X-1 some X-ray color dependence on intensity is apparent, indicating a hardening of the spectrum in the second half of the observation. The inner disk radius and temperature change, featuring the same (anti)correlation found in {\it RXTE} data (Wilms et al. 2000). QPOs were searched for. In LMC X-3 none was detected; in LMCX-1 a 3 sigma upper (9% rms) limit is given at 0.07 Hz, the frequency of the QPO discovered with Ginga.

arXiv comment10 pages, 5 figures. To be published in the ApJ Supplements

References in corpus (4)

• Discovery of Recurring Soft to Hard State Transitions in LMC X-3
• Spectral Evolution of PKS 2155-304 observed with BeppoSAX during an Active Gamma-ray Phase
• A Good Long Look at the Black Hole Candidates LMC X-1 and LMC X-3
• BeppoSAX observations of the black hole candidates LMC X-1 and LMC X-3

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