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Cyclotron resonant scattering and absorptionThe relativistic cross-sections for first-order absorption and second-order scattering are compared to determine the conditions under which the absorption cross-section is a good approximation to the much more complex scattering cross-section for purposes of modeling cyclotron lines in gamma-ray bursts. Differences in both the cross-sections and the line profiles are presented for a range of field strengths, angles, and electron temperatures. The relative difference of the cross-sections at one line width from resonance was found to increase with field strength and harmonic number. The difference is also strongly dependent on the photon angle to the magnetic field. For the field strength, 1.7 x 10 to the 12th G, and the angle inferred from the Ginga burst features, absorption is an excellent approximation for the profiles at the first and second harmonics.
Document ID
19910056277
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Harding, Alice K.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Daugherty, Joseph K.
(North Carolina, University Asheville, United States)
Date Acquired
August 15, 2013
Publication Date
June 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 374
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
91A40900
Distribution Limits
Public
Copyright
Other

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