Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19411402b&link_type=abstract
American Astronomical Society Meeting 194, #114.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Detailed time-dependent radiation transfer simulations of anisotropic gamma-ray burst environments have been performed in order to model the marginally detected Fe K alpha fluorescence line in the afterglow of GRB 970508. The assumed geometry is a torus of dense, metal-enriched material around the source of an intrinsically isotropic GRB explosion. The results indicate that a very high metal enrichment and a high density in this torus are required in order to explain the Fe K alpha fluorescence line if it is real. The torus must contain a significant fraction of one solar mass of iron within a few times 10(15) cm. Thus, if the detection of the Fe K alpha fluorescnece lines in GRB 970508 and GRB 970828 is real and the primary explosion of the GRBs are intrinsically isotropic, the environments of these GRBs must be characterized by conditions which are not known to exist in any well-understood astronomical object.
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