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A Chandra Spectroscopic Survey of Persistent Black Hole Candidates | | W. Cui
; Y.X. Feng
; S.N. Zhang
; M.W. Bautz
; G.P. Garmire
; N.S. Schulz
; | | Date: |
27 Jul 2002 | | Journal: | Astrophys.J. 576 (2002) 357-365 | | Subject: | astro-ph | | Affiliation: | Purdue), Y.X. Feng (Purdue), S.N. Zhang (UAH), M.W. Bautz (MIT), G.P. Garmire (Penn St.), and N.S. Schulz (MIT | | Abstract: | 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. | | Source: | arXiv, astro-ph/0207599 | | Services: | Forum | Review | PDF | Favorites | |
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