Computer Science
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe..26b&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Computer Science
Solar System And Misc
Scientific paper
The recent discovery of Fe Kα line features in the X-ray afterglows of several γ-ray bursts (GRBs), particularly the Chandra observation of GRB 991216, may provide important constraints on the immediate environment of the burst and hence on progenitor models. The large Fe Kα equivalent widths inferred from the X-ray observations favor models in which the line is produced when the primary X-ray emission from the source strikes Thomson-thick material and Compton scatters into our line of sight. We present such reflection spectra here, computed in a fully self-consistent manner, and discuss the range of ionization parameters that may be relevant to different models of GRBs. We argue that the presence of a strong hydrogen-like Kα line is unlikely because Fe XXVI photons are likely to be resonantly trapped and removed from the line core by Compton scattering. In contrast, a strong narrow emission line from He-like Fe XXV is prominent in the model spectra. We briefly discuss how these constraints may affect the line energy determination in GRB 991216.
Ballantyne David R.
Ramirez-Ruiz Enrico
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