Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-09-07
Mon. Not. Roy. Astron. Soc. 402 (2010) 1523-1535
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Typos fixed; minor clarifications. 13 pages, 7 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2009.16017.x
In recent work, we have shown that it is possible to link quantitatively many aspects of damped Lyman alpha (DLA) absorbers in the spectra of quasars to high resolution simulations of galaxy formation. Using runs from the same series of hydrodynamic numerical studies, we consider the expected properties of Lyman alpha absorbers seen in the spectra of high redshift (z>2) gamma ray burst afterglows (GRB-DLAs). If GRBs are associated with the death of massive stars, their afterglows provide insights into otherwise unprobed regions of protogalactic objects, but detailed physical interpretations are currently embryonic. We find that median impact parameters (measured from the potential minimum) are approximately 1 kpc for GRBs compared with 4 kpc for QSO-DLAs. However, an equally important difference is that GRB-DLAs are predominantly associated with halos of mass 10^10
Bellovary Jillian
Brooks Alyson
Deason Alis
Fynbo Johan P. U.
Governato Fabio
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