EXIST-observed GRBs As A Gateway to the z > 7 Universe

Details EXIST-observed GRBs As A Gateway to the z > 7 Universe EXIST-observed GRBs As A Gateway to the z > 7 Universe

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460203b&link_type=abstract

American Astronomical Society, AAS Meeting #214, #602.03

Physics

Scientific paper

With discovery and broadband follow-up rate of over 600 GRBs per year, the EXIST mission will transform the way in which the physics of GRBs are studied and the ways in which the universe will be probed. Here, we review the EXIST "GRBs a probes" science objectives in light of recent discoveries. In particular, the spectroscopic discovery of a z=8.2 GRB (090423) solidifies the notion that not only do the progenitors of GRBs exist in the early universe, they are detectable. EXIST aims to not only discover tens of z>7 GRBs per year but obtain the necessary followup onboard -- with the X-ray imager and optical-IR imaging spectrograph -- to probe the nature of metal enrichment in nascent galaxies and the reionization history of the universe. Based on the reported brightnesses of GRB 090423 at early times, that event would have had its redshift measured on board within 5min and a R = 3000 resolution spectrum obtained within 30 min to measure the Ly-alpha damping wing profile, constraining the local reionization structure around the host.

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