The metallicity properties of long-GRB hosts

Details The metallicity properties of long-GRB hosts The metallicity properties of long-GRB hosts

2011-10-05

arxiv.org/abs/1110.1098v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

proceeding of the workshop "GRBs as probes: from the progenitor's environment to the high redshift Universe", Como, Italy, 16-

Scientific paper

The recently-discovered Fundamental Metallicity Relation (FMR), which is the tight dependence of metallicity on both mass and SFR, proves to be a very useful tool to study the metallicity properties of various classes of galaxies. We have used the FMR to study the galaxies hosting long-GRBs. While the GRB hosts have lower metallicities than typical galaxies of the same mass, i.e., they are below the mass-metallicity relation, they are fully consistent with the FMR. This shows that the difference with the mass-metallicity relation is due to higher than average SFRs, and that GRBs with optical afterglows do not preferentially select low-metallicity hosts among the star-forming galaxies.

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