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Title:
The Discovery of Broad P Cygni X-Ray Lines from Circinus X-1 with the Chandra High-Energy Transmission Grating Spectrometer
Authors:
Brandt, W. N.; Schulz, N. S.
Affiliation:
AA(Department of Astronomy and Astrophysics, 525 Davey Laboratory, Pennsylvania State University, University Park, PA, 16802; Department of Space Studies, Southwest Research Institute, 1050 Walnut Street, Boulder, CO 80302-5143 .), AB(Center for Space Research, 70 Vassar Street, Building 37, Massachusetts Institute of Technology, Cambridge, MA 02139; Department of Space Science, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78256.)
Publication:
The Astrophysical Journal, Volume 544, Issue 2, pp. L123-L127. (ApJ Homepage)
Publication Date:
12/2000
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual: Constellation Name: Circinus X-1, Stars: Neutron, Techniques: Spectroscopic, X-Rays: Stars
DOI:
10.1086/317313
Bibliographic Code:
2000ApJ...544L.123B

Abstract

We present the first grating-resolution X-ray spectra of the X-ray binary Circinus X-1, obtained with the High-Energy Transmission Grating Spectrometer on Chandra. These reveal a rich set of lines from H-like and/or He-like Ne, Mg, Si, S, and Fe detected with a high signal-to-noise ratio. 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 about 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 Hα line from Cir X-1, suggesting that the two phenomena may be related. We discuss outflow models and propose that the P Cygni profiles may arise in the moderate temperature (~5×106 K) region of the wind from an 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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