Query : 1999A&AS..138..543B

1999A&AS..138..543B - Astron. Astrophys., Suppl. Ser., 138, 543-544 (1999/September-0)

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


Abstract (from CDS):

If γ-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.

Abstract Copyright:

Journal keyword(s): atomic processes - radiative transfer - gamma-rays: bursts - X-rays: bursts

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 862 1
2 GRB 980828 gB 09 37 +22.7           ~ 15 1

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