The Discovery of Broad P Cygni X-ray Lines from Circinus X-1 with the Chandra HETGS

Details The Discovery of Broad P Cygni X-ray Lines from Circinus X-1 with the Chandra HETGS The Discovery of Broad P Cygni X-ray Lines from Circinus X-1 with the Chandra HETGS

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2806b&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #28.06; Bulletin of the American Astronomical Society, Vol. 32, p.1229

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first grating-resolution X-ray spectra of the X-ray binary Cir X-1, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-ray Observatory. These reveal a rich set of highly significant lines from H-like and/or He-like Ne, Mg, Si, S and Fe. Remarkably, the lines are broad (+/- 2000 km s-1) and show P Cygni profiles. The absorption components of the lines extend to low velocity, and they have almost the same widths and strengths as the corresponding emission components. The widths of the X-ray P Cygni lines are comparable to that of the broad component of the strong, asymmetric H-alpha line that has been intensively studied over the past 20 years, suggesting that the two phenomena are related. We discuss outflow models and propose that the P Cygni profiles arise in the moderate temperature ( ~ 5x 106 K) region of the wind from a flared and X-ray heated accretion disk. This basic picture strengthens the idea that the accretion disk in Cir X-1 is viewed in a relatively edge-on manner, and it suggests that Cir X-1 is the X-ray binary analog of a Broad Absorption Line quasar.

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