Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919403b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #194.03; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The progenitors of short GRBs are now known to be related to an old stellar population, possibly NS-NS or NS-BH binaries. However, due to the lack of direct observations (gravitational waves, chemical abundances), a more detailed understanding of the progenitor population has to rely on statistical studies. In this talk I will review recent observations and theoretical work focused on the use of host galaxy and cluster associations to assess the age distribution of the progenitors. Of particular promise is the ratio of short GRBs in cluster and field early-type galaxies, since this method overcomes any systematic differences between progenitors in earlyand late-type galaxies. I will summarize the results of recent multi-object spectroscopy and X-ray observations aimed at applying this approach, as well as the discovery of a redshift 1.8 cluster associated with a short GRB.
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