Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-27
Astrophys.J. 576 (2002) 357-365
Astronomy and Astrophysics
Astrophysics
ApJ, 576, in press (Sept.)
Scientific paper
10.1086/341548
We present results from observations of persistent black hole candidates with the High Energy Transmission Gratings aboard the Chandra X-ray Observatory. The sources include LMC X-1, LMC X-3, GRS 1758-258, and Cyg X-1. Along with the published results on 1E1740.7-2942, we have completed a high-resolution spectroscopic survey of such systems. The observed X-ray spectra of LMC X-1 and LMC X-3 show no prominent discrete features, while absorption edges (Mg K and Si K) are detected in the spectrum of GRS 1758-258. The edges are likely to be of interstellar origin. In most cases, the X-ray continuum can be described well by models that are often adopted in low-resolution studies of black hole candidates: a multi-temperature disk spectrum plus a Comptonization component. However, the relative contribution of the two components varies greatly among different sources. For instance, only the disk component is present for LMC X-1 and GRS 1758-258, while the Comptonized component is required for other sources. We discuss general issues related to obtaining disk parameters from modeling X-ray continuum.
Bautz Mark W.
Cui Wei-Wei
Feng Yue-Xing
Garmire Gordon P.
Schulz Norbert S.
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