Mathematics – Probability
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1358..275n&link_type=abstract
GAMMA RAY BURSTS 2010. AIP Conference Proceedings, Volume 1358, pp. 275-278 (2011).
Mathematics
Probability
Gamma-Ray Sources (Astronomical), Stellar Mass, Star Formation, Supernovae, Gamma-Ray Sources, Gamma-Ray Bursts, Masses, Star Formation, Supernovae
Scientific paper
Some theoretical studies on the origin of long gamma-ray bursts (GRBs) using stellar evolution models suggest that a low metallicity environment may be a necessary condition for a GRB to occur (Z<~several×10-1Zsolar). It has also been suggested from the observations that GRBs preferentially occur in galaxies with low-metallicity. However, recent discoveries of high-metallicity host galaxies of some GRBs cast doubt on the requirement of low-metallicity in GRB occurrence. On the other hand, it should be kept in mind that GRB host galaxies may have different metallicity from that of GRB progenitors, because galaxies are chemically inhomogeneous. In this study, we predict the metallicity probability distribution function of GRB host galaxies, assuming stellar mass function, mass-metallicity relation, and mass-SFR relation. We take internal dispersion of metallicity in each galaxy into account. Assuming GRBs trace low-metallicity star formation
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