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26 April 2024 |
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Revealing the Focused Companion Wind in Cygnus X-1 with Chandra | | J.M. Miller
; P. Wojdowski
; N.S. Schulz
; H.L. Marshall
; A.C. Fabian
; R.A. Remillard
; R. Wijnands
; W.H.G. Lewin
; | | Date: |
26 Aug 2002 | | Journal: | Astrophys.J. 620 (2005) 398-404 | | Subject: | astro-ph | | Affiliation: | MIT Center for Space Research, University of Cambridge Institute of Astronomy | | Abstract: | We have analyzed a Chandra HETGS spectrum of the Galactic black hole Cygnus X-1, obtained at a source flux which is approximately twice that commonly observed in its persistent low-intensity, spectrally-hard state. We find a myriad of absorption lines in the spectrum, including Ly-alpha lines and helium-like resonance lines from Ne, Na, Mg, and Si. We calculate a flux-weighted mean red-shift of ~100 km/s and a flux-weighted mean velocity width of 800 km/s (FWHM) for lines from these elements. We also detect a number of transitions from Fe XVIII-XXIV and Ni XIX-XX in absorption; however, the identification of these lines is less certain and a greater range of shifts and breadth is measured. Our observation occurred at a binary phase of phi = 0.76; the lines observed are consistent with absorption in an ionized region of the supergiant O9.7 Iab companion wind. The spectrum is extremely complicated in that a range of temperatures and densities are implied. Prior Chandra HETGS spectra of Cygnus X-1 were obtained in a similar transition state (at phi = 0.93) and in the low/hard state (at phi= 0.84). Considered together, these spectra provide evidence for a companion wind that is focused as it flows onto the black hole primary in this system. | | Source: | arXiv, astro-ph/0208463 | | Services: | Forum | Review | PDF | Favorites | |
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