Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..271s&link_type=abstract
Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he
Astronomy and Astrophysics
Astronomy
Scientific paper
We have derived heavy element column densities in three gamma-ray burst (GRB) optical transients, associated with the circumburst or interstellar medium (ISM) of the host galaxy. In comparison with the same elements observed in damped Lyman-α (DLA) systems along QSO sight lines, we find much higher column densities of Zn II. Very small [Fe/Zn], [Si/Zn], and [Cr/Zn] values in GRB-DLAs is also indicating larger dust depletions. This appears to be in contradiction with the low reddening typical seen in GRBs. One possible way to reconcile is a dust grain-size distribution biased towards big grains, which would give a grey extinction. Our findings support the idea that primarily optically selected QSOs probe mainly the low gas/dust ISM of high redshift galaxies, while the more powerful GRBs can be detected in denser regions (molecular clouds and star forming regions).
Fall Michael S.
Fiore Fabrizio
Savaglio Sandra
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