Constraining the intergalactic magnetic field with cascading TeV emission from cosmological GRBs

Mathematics – Logic

Scientific paper

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Electric And Magnetic Fields, Gamma-Ray Sources, Gamma-Ray Bursts, Elementary Particle Processes

Scientific paper

The high energy (> 100 GeV) emission of cosmological GRBs will be attenuated by photon-photon pair production on infrared and optical background light. The energy of these ``absorbed'' photons is reprocessed by cascading to lower energies. The reprocessing induces a delay in the arrival of cascade X-rays and results in a finite angular size for the source. If an intergalactic magnetic field is present then the X-ray flux as a function of both time and angle from the source change in a way that is characteristic of the field strength. We here calculate the cascade X-ray flux expected from a bright GRB and show that fields as low as 10-22 G have a discernable effect on the flux. The flux level, however, is too low to currently be detected, but a similar analysis might be more fruitfully applied to blazar AGNs.

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