Other
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.4809a&link_type=abstract
American Astronomical Society, 186th AAS Meeting, #48.09; Bulletin of the American Astronomical Society, Vol. 27, p.880
Other
Scientific paper
Several x-ray pulsars exhibit line structure in their spectra that has been interpreted as originating from cyclotron processes when the radiation scatters from plasma electrons embedded in a strong magnetic field. A few of these objects also show evidence of a second spectral feature that, traditionally, has been thought to be the second cyclotron harmonic. We present detailed calculations of emitted flux spectra for x-ray pulsars that incorporate a two--component model of the accretion cap. The two components are modeled as slabs separated by a shock wave where the post--shock slab is the subsonic high density and temperature plasma that creates the radiation via free--free or bremstrahlung processes and the pre--shock material is represented by a relatively cool low density plasma that is moving near the free--fall velocity. We find that two spectral features are easily produced; one representing the fundamental cyclotron harmonic of the post--shock plasma; and another that is a Doppler shifted line produced by scattering in the pre--shock plasma. Our models include the effects of angle--dependent Doppler shift and aberration. We demonstrate the effect for a range of plasma parameters and compare our results to observations.
Alexander S. G.
Davila Javier
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