Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..344...79v&link_type=abstract
The Cool Universe: Observing Cosmic Dawn, ASP Conference Series, Vol. 344, Proceedings of the conference held 4-8 October, 2004
Other
1
Scientific paper
To date, only a handful of Damped Lyman alpha systems have been detected in GRB afterglows, and most of these 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(H I)=21.90±0.07, higher than any (GRB or QSO) DLA H I column density inferred directly from Lyα in absorption. We discuss several other properties, such as the metallicity, the detection of fine-structure lines of Si II, 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 upcoming launch of the Swift satellite will make 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.
Ellison Sara
Hjorth Jens
Ledoux Cedric
Vreeswijk Paul
Wijers Ralph
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