GRB Afterglows as a New Probe of the ISM and IGM at High Redshift

Details GRB Afterglows as a New Probe of the ISM and IGM at High Redshift GRB Afterglows as a New Probe of the ISM and IGM at High Redshift

2006-02-07

arxiv.org/abs/astro-ph/0602144v1

Astronomy and Astrophysics

Astrophysics

6 pages including 4 figures; to appear in the proceedings of the 16th Annual October Astrophysics Conference in Maryland, "Gam

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, GRB050730 at z=3.968 and GRB051111 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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