Time-dependent photoionization and fluorescence line emission in gamma-ray burst environments

Details Time-dependent photoionization and fluorescence line emission in gamma-ray burst environments Time-dependent photoionization and fluorescence line emission in gamma-ray burst environments

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..543b&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.543-544

Astronomy and Astrophysics

Astrophysics

6

Atomic Processes, Radiative Transfer, Gamma-Rays: Bursts, X-Rays: Bursts

Scientific paper

If gamma -ray bursts (GRBs) are associated with dense star-forming regions, photoelectric absorption by the circumburster material (CBM) will occur. As the burst evolves, the surrounding material is photoionized, leading to fluorescence line emission and reduced photoelectric absorption opacity. We have numerically simulated this problem, accounting for all relevant microscopic processes. We find that if GRBs are hosted in a quasi-isotropic surrounding medium, photoionization of the CBM leads to a constant but weak level of delayed fluorescence line emission on timescales of weeks to months after the GRB. A temporally evolving Fe K edge absorption feature can serve as diagnostic tool for redshift measurements.

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