Illuminated, and enlightened, by GRB 991216

Details Illuminated, and enlightened, by GRB 991216 Illuminated, and enlightened, by GRB 991216

2000-11-30

arxiv.org/abs/astro-ph/0011580v2

Astronomy and Astrophysics

Astrophysics

4 pages, 2 postscript figures, body of paper abridged in order to fit the four pages of ApJL. Minor corrections. ApJ Letters i

Scientific paper

10.1086/319475

We consider models for the generation of the emission line recently discovered in the X-ray afterglow spectrum of several bursts, and especially of GRB 991216 observed by Chandra. These observations suggest the presence of 0.1-1 solar masses of iron in the vicinity of the bursts. We show that there are strong geometrical and kinematical constraints on the line emitting material. We discuss several classes of models, favoring one where the line photons are produced by reflection off the walls of a wide funnel of semi-opening angle 45 degrees, excavated in a young (a few months old) supernova remnant made of ~10 solar masses with radius 6x10^15 cm, and ~1 solar mass of iron, providing strong support for the SupraNova model.

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