Highly Ionized Absorption in the X-ray Spectrum of Cyg X-1

Details Highly Ionized Absorption in the X-ray Spectrum of Cyg X-1 Highly Ionized Absorption in the X-ray Spectrum of Cyg X-1

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002xrb..confe..23m&link_type=abstract

X-ray Binaries in the Chandra and XMM-Newton Era (with an emphasis on Targets of Opportunity), Abstracts of the conference held

Physics

Actively Accreting And Transient Binaries

Scientific paper

Using the Chandra High Energy Transmission Grating Spectrometer (HETGS), we have found significant absorption features in the X-ray spectrum of Cyg X-1 taken in the continuous clocking mode. These features include resonance lines of He-like ions of S, Si, and Mg; the Ly alpha lines of H-like S, Si, Mg, and Ne; and several lower ionization lines of Fe XX, XXII, and XXIV. The lines are resolved in many cases, giving line widths of order 300 km/s and the are redshifted by 460 ± 10 km/s. These features are interpreted in the context of an accreting stellar wind model that is ionized by the X-ray source. In addition, there are clear absorption features due to neutral Mg, Fe, and O in the interstellar medium.

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