Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347609b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #476.09; Bulletin of the American Astronomical Society, Vol. 41, p.442
Astronomy and Astrophysics
Astronomy
Scientific paper
Long-duration gamma-ray bursts (GRBs) are associated with the deaths of massive, short-lived stars, and thus may be useful in tracking star formation in the universe. However, GRB progenitor models suggest that they might occur only in low-metallicity environments, introducing a bias into star formation studies. Presented here are the high-resolution spectra of two GRB host galaxies, one at z 0.03 and the other at z 0.7. The nearby galaxy, the host of GRB 060218, has a low metallicity, but one that is comparable to local galaxies of similar luminosity. It has little to no extinction and a star formation rate of 2x10-2 M&sun;yr-1. The metallicity of the more distant galaxy, the host of GRB 991208, is not well constrained because the Hα and [N II] lines are redshifted into the near infrared and were not observed. It has a star formation rate of 1-9 M&sun;yr-1 and, unlike the majority of GRB hosts, is dusty. These two galaxies will eventually be a part of a larger sample of GRB hosts. This work was conducted by a Research Experience for Undergraduates (REU) position at the University of Hawai'i's Institute for Astronomy and funded by the NSF.
Bagley Megan
Kewley Lisa J.
Levesque Emily M.
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