Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21335006b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #350.06; Bulletin of the American Astronomical Society, Vol. 41, p.487
Astronomy and Astrophysics
Astronomy
Scientific paper
Gamma-ray bursts (GRBs) provide extremely luminous background light sources that can be used to study the high redshift universe out to z 12. Identification of high-z GRBs has been difficult to date because no good high-z indicators have been found in the prompt or afterglow emission of GRBs, so ground-based spectroscopic observations are required. I will discuss two missions designed to measure the redshift of GRBs immediately after their discovery. JANUS is a SMEX mission in Phase A and incorporates a GRB locator and a near IR telescope with low resolution spectroscopic capability. It is expected to discover 50 GRBs with z>5; as well as hundreds of high redshift quasars. Xenia is a mission concept that measures GRB redshifts with high resolution X-ray spectroscopy. Both missions will allow study of the reionization phase, star formation, and galaxy formation in the very early universe. In addition, Xenia will study cluster formation and the WHIM, following cosmochemical evolution from the very earliest times to the present.
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