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- W76655145 abstract "A gamma‐ray burst spectrum can be modeled by passing a power law spectrum through a medium that is optically thick to Compton scattering. The roll‐over of the Klein‐Nishina cross section at high energies produces a break in the spectrum at several hundred keV if the gamma‐ray source is at z≊1. Photon‐photon pair production limits the scattering region’s size to greater than ≊0.1 parsec. Because the optical depth is greater than unity for a length scale of several parsecs, the density must be of order 105 cm−3, which occurs only in molecular clouds at the centers of galaxies. This model therefore precludes source models employing objects that are common to the galactic plane—for example, merging neutron stars. The model spectrum is described by five free parameters: a cosmological red shift, a Thomson optical depth, a power law index, a metallicity, and an amplitude. The attenuation model can be tested by the duration of a burst. Small angle scattering of x‐rays by dust within the molecular cloud produces an x‐ray afterglow. A consequence of this model is that any optical or ultraviolet radiation is heavily absorbed, making detection of gamma‐ray bursts at these energies unlikely." @default.
- W76655145 created "2016-06-24" @default.
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- W76655145 date "1994-01-01" @default.
- W76655145 modified "2023-09-24" @default.
- W76655145 title "The Compton attenuation model of cosmological gamma-ray bursts" @default.
- W76655145 doi "https://doi.org/10.1063/1.45923" @default.
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