Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21823804l&link_type=abstract
American Astronomical Society, AAS Meeting #218, #238.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
GRBs are now a premier tool for studying the high redshift universe. We use GRB afterglows as probes in a novel method for determining the galaxy mass-metallicity relation at 3 < z 3. We also determine the rest-frame optical luminosity distribution of the hosts, and find it to be similar to the distribution of GRB hosts at z 1 and of Lyman Break Galaxies at the same redshift. Using a conservative range of mass-to-light ratios for simple stellar populations, we infer the host stellar masses and present galaxy mass-metallicity measurements at z 3-5. We find that the detected GRB hosts with M* 2e10 solar masses display a wide range of metallicities, but that the mean metallicity at this mass scale (Z 0.1 solar) is lower compared with measurements at z 3. Combined with stacking of the non-detected hosts (M < 3x10^9 solar masses, Z < 0.03 solar), we find evidence for the existence of an M*-Z relation at z 3.5 and continued evolution of this relation to systematically lower metallicities from z 2.
Berger Edmond
Chary Ranga Ram
Laskar Tanmoy
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