Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-14
Astrophys.J.597:1017-1022,2003
Astronomy and Astrophysics
Astrophysics
16 pages, 4 fiugres. accepted for publication in the v597 n2 ApJ November 10, 2003 issue
Scientific paper
10.1086/378495
Cyg X-1 was observed in the high state at the conjunction orbital phase (0) with HETG/Chandra. Strong and asymmetric absorption lines of highly ionized species were detected, such as Fe XXV, Fe XXIV, Fe XXIII, Si XIV, S XVI, Ne X, and etc. In the high state the profile of the absorption lines are composed of an extended red wing and a less extended blue wing. The red wings of higher ionized species are more extended than that of lower ionized species. The detection of these lines provides a way to probe the properties of the flow around the companion and the black hole in Cyg X-1 during the high state. A broad emission feature around 6.5 keV was significantly detected from the both spectra of HETG/Chandra and PCA/RXTE. This feature appears to be symmetric and can be fitted with a Gaussian function rather than the Laor disk line model of fluorescent Fe K$_\alpha$ line from an accretion disk. The implications of these results on the structure of the accretion flow of Cyg X-1 in the high state are discussed.
Feng Yue-Xing
Tennant Allyn F.
Zhang Shuang Nan
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