Spectral studies of magnetic photon splitting in the March 5 event and SGR 1806-20

Details Spectral studies of magnetic photon splitting in the March 5 event and SGR 1806-20 Spectral studies of magnetic photon splitting in the March 5 event and SGR 1806-20

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..384..921c&link_type=abstract

Gamma-ray bursts: 3rd Huntsville symposium. AIP Conference Proceedings, Volume 384, pp. 921-925 (1996).

Physics

2

Gamma-Ray Sources, Gamma-Ray Bursts, Radiation Mechanisms, Polarization, Neutron Stars

Scientific paper

Soft Gamma Repeaters (SGRs) have been proposed to be neutron stars with extremely strong magnetic fields of >~5×1014 G. The spectra of SGR 1806-20 and the initial spike of the March 5 event can be fitted by a photon-splitting modified spectrum under such a strong magnetic field. A moderate beaming pattern is needed for the emission producing the initial spike of the March 5 event, and the strength of its magnetic field is not well constrained by spectral fitting. An extended emission region over the whole stellar surface is preferred for SGR 1806-20 rather than a localized equatorial region. The intrinsic emission of SGR 1806-20 should be nearly isotropic. The magnetic field near the surface of SGR 1806-20 should be >10 Bc (Bc=4.4×1013 G) and its GM/c2R is >~0.25.

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