Equivalent width of cyclotron lines in gamma-ray burst spectra

Details Equivalent width of cyclotron lines in gamma-ray burst spectra Equivalent width of cyclotron lines in gamma-ray burst spectra

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..109n&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 2, 1992, p. 109-115. Research supported b

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Cyclotron Radiation, Energy Spectra, Gamma Ray Bursts, Radiative Transfer, Spectral Line Width, X Ray Astronomy, Astronomical Spectroscopy, Computational Astrophysics, Ginga Satellite, Interstellar Magnetic Fields

Scientific paper

Multiangle radiative transfer problems of a plasma slab with a strong magnetic field illuminated from below by incident gamma-ray radiation are solved. Equivalent widths of the first- and second-harmonic cyclotron lines are obtained. Good agreement is found with previous calculations by Nishimura (1991) and Wang et al. (1989) when the Thomson optical depth is smaller than 7.59 x 10 exp -4, except that the equivalent width of the first harmonic line is smaller by a factor of 3-30 than that of the second harmonic line in the case of large optical depth and small zenith angle. The discrepancy is explained by the effect of a Lorentzian wing due to the natural linewidth included in the calculation.

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