Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714101g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #141.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
One of the most powerful means to study the formation and evolution of gamma-ray bursts is by observing there environments. While short bursts have been detected in nearby galaxies of all types, long burst hosts are dominated by blue irregulars leading to speculation of metal poor host galaxies, a result which has now been confirmed via emission line metallicity diagnostics. However beginning with LGRB 051022 at log(O/H)+12 = 8.77 (using the R23 method with Kobulnicky & Kewley 2004 scale) three exceptions to this trend have been found. This extends the metallicity range of LGRB hosts to that found throughout the Milky Way, challenges conventional wisdom that LGRBs require low metallicity progenitor environments and has significant implications in understanding LGRB formation. Here I present the results of our observations of two of these super-solar metallicity host galaxies, analysis of the high Z host population with respect to various comparison samples, and ongoing efforts to more directly probe the metallicities of the burst progenitors.
Brinchmann Jarle
Charlot Stephane
Fruchter Andrew
Graham John
Huang Kaibin
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