Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...660.1146s&link_type=abstract
The Astrophysical Journal, Volume 660, Issue 2, pp. 1146-1150.
Astronomy and Astrophysics
Astronomy
5
Galaxies: Clusters: General, Galaxies: Formation, Gamma Rays: Bursts
Scientific paper
We determine the relative rates of short GRBs in cluster and field early-type galaxies as a function of the age probability distribution of their progenitors, P(τ)~τn. This analysis takes advantage of the difference in the growth of stellar mass in clusters and in the field, which arises from the combined effects of the galaxy stellar mass function, the early-type fraction, and the dependence of star formation history on mass and environment. This approach complements the use of the early- to late-type host galaxy ratio, with the added benefit that the star formation histories of early-type galaxies are simpler than those of late-type galaxies, and any systematic differences between progenitors in early- and late-type galaxies are removed. We find that the ratio varies from Rcluster/Rfield~0.5 for n=-2 to ~3 for n=2. Current observations indicate a ratio of about 2, corresponding to n~0-1. This is similar to the value inferred from the ratio of short GRBs in early- and late-type hosts, but it differs from the value of n~-1 for neutron star (NS) binaries in the Milky Way. We stress that this general approach can be easily modified with improved knowledge of the effects of environment and mass on the build-up of stellar mass, as well as the effect of globular clusters on the short GRB rate. It can also be used to assess the age distribution of Type Ia supernova progenitors.
Berger Edmond
Shin Min-Su
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