The Origin of X-Ray Rich Gamma-Ray Bursts: High-Z Events and New Cosmic Explosions

Details The Origin of X-Ray Rich Gamma-Ray Bursts: High-Z Events and New Cosmic Explosions The Origin of X-Ray Rich Gamma-Ray Bursts: High-Z Events and New Cosmic Explosions

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1228p&link_type=abstract

Chandra Proposal ID #04500914

Physics

Chandra Proposal Id #04500914

Scientific paper

X-ray Flashes (XRF, aka X-ray rich GRB's) have been recently identified as a new class of 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 would be redshifted into the X-ray band and absorption by Ly_{alpha} forest clouds would effectively estinguish optical photons. 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 ("dirty" fireball). We propose to follow-up with Chandra/ACIS one of these events identified either by HETE-2 or INTEGRAL.

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