DLA systems in GRB afterglows

Details DLA systems in GRB afterglows DLA systems in GRB afterglows

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf..174v&link_type=abstract

Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M

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Scientific paper

To date, half a dozen DLAs have been detected in grb afterglows, but most have modest signal-to-noise ratios. Our detection of a DLA in the afterglow of grb 030323 is unambiguous: its neutral hydrogen column density is log N(HI)=21.90±0.07, higher than any (grb- or QSO-) DLA hi column density inferred directly from Lyα in absorption. We discuss several other properties such as the metallicity, the detection of fine-structure lines of siii, and our strong upper limit on the H2 content. The grb afterglow allows us to infer all these quantities, even with the host being as faint as v=28. The successful launch of the swift satellite (november 2004) has made high-resolution spectroscopy of a large sample of grb afterglows possible. This will offer a unique way to study in detail the interstellar medium inside grb host galaxies as a function of redshift.

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