Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17061c&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present fits to accreting pulsar spectra using models in which an assumed continuum has undergone significant cyclotron resonant scattering by electrons in a large (10^12 G) magnetic field. This scattering produces harmonically spaced ``cyclotron lines,'' or line-like spectral features that arise due to the scattering of photons on electrons whose energies are constrained into Landau levels perpendicular to the B-field. The models are based on Monte Carlo simulations using relativistic Compton scattering cross sections, including natural line widths and four harmonics (the fundamental plus three overtones). We discuss how the cyclotron line profiles, which can be quite complex, vary with scattering geometry, viewing angle with respect to the B-field, electron temperature, and underlying continuum shape. We use these models to fit the observed spectra of 4U 0115+63 and Hercules X-1 at selected rotation phases, and discuss their applicability.
Araya-Gochez Rafael
Coburn Wayne
Heindl William
Kretschmar Peter
Kreykenbohm Ingo
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