X-ray spectral features from GRBs: Predictions of progenitor models

Details X-ray spectral features from GRBs: Predictions of progenitor models X-ray spectral features from GRBs: Predictions of progenitor models

2000-06-06

arxiv.org/abs/astro-ph/0006076v2

Astronomy and Astrophysics

Astrophysics

20 pages, including 8 figures and 3 tables. Uses epsf.sty, rotate.sty. Final version, accepted for publication in to ApJ. Revi

Scientific paper

10.1086/318346

We investigate the potentially observable prompt or delayed X-ray spectral features from the currently popular gamma-ray burst (GRB) models. During the evolution of many GRB progenitors, a disk around the central GRB source is produced. Shock heating as the GRB ejecta collide with the disk may produce observable X-ray features. We first summarize predictions deduced from previous calculations which invoke photoionization and relativistic blast waves. We then calculate the quasi-thermal X-ray line features produced assuming the ejecta are nonrelativistic (which is more likely for the disk interactions of many GRB models). In the framework of the Hypernova/Collapsar model, delayed (a few days - several months after the GRB) bursts of line-dominated, thermal X-ray emission may be expected. The He-merger scenario predicts similar X-ray emission line bursts <~ a few days after the GRB. These X-ray signatures should be observable with Chandra and XMM-Newton out to at least z ~ 1. Weak emission line features <~ a few days after the GRB may also result from the supranova GRB scenario. In all three cases, significant X-ray absorption features, in particular during the prompt GRB phase, are expected. No significant X-ray spectral features might result from compact-object binary mergers.

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