GRB Afterglows as a New ISM and IGM Probe

Details GRB Afterglows as a New ISM and IGM Probe GRB Afterglows as a New ISM and IGM Probe

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..534c&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 534-

Astronomy and Astrophysics

Astrophysics

3

Gamma-Ray Sources, Gamma-Ray Bursts, Physical Properties

Scientific paper

We summarize results from a study of the metallicity, relative abundances, gas density, and kinematics of dense media in the host environment of two Swift bursts, GRB 050730 at z = 3.968 and GRB 051111 at z = 1.549. Both GRB hosts exhibit strong absorption features from excited Si+ and Fe+ ions, indicating an extreme ISM environment that is similar to what is found around massive stars like luminous blue variables (LBV) and Wolf-Rayet stars. The extreme ISM properties have never been observed in intervening quasar absorption line systems beyond the local universe.

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