Broad P Cygni X - ray Lines from Circinus X -
نویسنده
چکیده
Chandra High Energy Transmission Grating Spectrometer (HETGS) observations of the extremely luminous and violent X-ray binary Cir X-1 reveal many X-ray emission lines showing broad P Cygni profiles. These are from H-like and He-like ions of Ne, Mg, Si, S, Ar, and Fe. The lines originate in a high-velocity (up to 2000 km s) outflow, which may be an accretion disk wind. Cir X-1 has a radio jet, and during some periastron passages of the neutron star (orbital phase = 0.0), it flares at radio, infrared and X-ray wavelengths. The X-ray P Cygni profiles were observed during this phase, where we also expect the strongest mass transfer from the companion star. We present new results on the time variability of the P Cygni profiles and discuss their general importance.
منابع مشابه
The Discovery of Broad P Cygni X-ray Lines from Circinus X-1 with the Chandra High Energy Transmission Grating Spectrometer
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 ex...
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