Mathematics – Logic
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1065f&link_type=abstract
Chandra Proposal ID #03508096
Mathematics
Logic
Chandra Proposal Id #03508096
Scientific paper
The X-ray flashes (XRFs) are identified in BeppoSAX observations as fast X-ray transients that exhibit the properties of gamma-ray burst (GRB) prompt X-ray counterparts while lacking detectable gamma-ray emission (Heise et al. 2001, astro-ph/0111246). The XRFs are distinguished from Galactic phenomena by their nonthermal spectra, fast evolution, and near-isotropic sky distribution. However, the absence of gamma-ray emission means that either (1) the XRFs originate at very high redshifts, z>5; or (2) the XRFs are a GRB-like phenomenon with Lorentz factors intermediate to GRBs (L>100) and supernovae (L~1). Chandra, VLA, and HST observations of XRF011030 established for the first time that, in at least this case, the XRF was the result of (2) a highly energetic explosion at a cosmological distance z<3 (GCNs 1136, 1143, 1268). Chandra observations of the XRF020427 will allow us to identify and study only the second such cosmological X-ray flash.
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