The origin of X-ray rich Gamma-Ray Bursts: Beacons in the Dark High-z Universe?

Details The origin of X-ray rich Gamma-Ray Bursts: Beacons in the Dark High-z Universe? The origin of X-ray rich Gamma-Ray Bursts: Beacons in the Dark High-z Universe?

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1694p&link_type=abstract

Chandra Proposal ID #06500250

Physics

Chandra Proposal Id #06500250

Scientific paper

X-ray rich GRBs (a.k.a. X-ray Flash, XRFs) constitute a significant fraction (≈ 50%) of the population of "standard" long GRB. This class could hide some of the long-sought members of high-z GRB. For an event at z>5, the peak of the gamma-ray emission and the absorption by Lyalpha forest clouds would be redshifted into the X-ray and the optical bands respectively. Thus, a high-z GRB would appear as a optically dark X-ray rich GRB. They could also be a new type of cosmic explosion, likely similar to a GRB, but in which the fireball expansion is mildly relativistic due to higher fraction of baryon mass entrained in the shell ("dirty" fireball). We propose to follow-up with Chandra/ACIS two of these events identified either by SWIFT, HETE-2 or INTEGRAL.

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