Computer Science – Numerical Analysis
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..245b&link_type=abstract
In its The Compton Observatory Science Workshop p 245-252 (SEE N92-21874 12-90)
Computer Science
Numerical Analysis
2
Annihilation Reactions, Gamma Ray Bursts, Magnetic Fields, Pair Production, Pulsars, Spectral Line Width, Asymmetry, Doppler Effect, Field Strength, Magnetic Flux, Signatures, Stellar Models, Stellar Spectra
Scientific paper
The annihilation spectrum of pairs with 1-D thermal distributions in the presence of a strong magnetic field is calculated. Numerical analysis of the spectrum are performed for mildly relativistic temperatures and for different angles of emission with respect to field lines. Teragauss magnetic fields are assumed so that conditions are typical of gamma ray burst and pulsar environments. The spectra at each viewing angle reveal asymmetric line profiles that are signatures of the magnetic broadening and red shifting of the line: these asymmetries are more prominent for small viewing angles. Thermal Doppler broadening tends to dominate in the right wing of the line and obscures the magnetic broadening more at high temperatures and smaller viewing angles. This angular dependence of the line asymmetry may prove a valuable diagnostic tool. For low temperatures and magnetic field strengths, useful analytic expressions are presented for the line width, and also for the annihilation spectrum at zero viewing angle. The results presented find application in gamma ray burst and pulsar models, and may prove very helpful in deducing field strengths and temperatures of the emission regions of these objects from line observations made by Compton GRO and future missions.
Baring Matthew G.
Harding Alice K.
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