More realistic cyclotron line models for accreting pulsar spectra

Details More realistic cyclotron line models for accreting pulsar spectra More realistic cyclotron line models for accreting pulsar spectra

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..207k&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Computer Science

2

X Rays: Stars, Neutron Stars, Magnetic Fields, Line Formation, Radiative Transfer

Scientific paper

We present first results of a project to analyze spectra of accreting X-ray pulsars modeling the cyclotron line features in a more realistic manner than customary. Our model spectra are based on results of Monte-Carlo simulations, using relativistic Compton-scattering cross sections, including natural line widths and considering up to four harmonic photons in two idealized limiting cases of "plasma geometry": plane parallel and cylindrical. These model spectra are compared with RXTE spectra showing cyclotron line features. We discuss implications for the determination of field strength from cyclotron features and the possibilities that INTEGRAL will open for this kind of analysis.

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