Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...7e..35i&link_type=abstract
The Universe at z > 6, 26th meeting of the IAU, Joint Discussion 7, 17-18 August 2006, Prague, Czech Republic, JD07, #35
Computer Science
Scientific paper
We study the delayed emission of gamma-ray bursts to investigate the magnetic fields in the extragalactic fields. If the energy of photons from each gamma-ray burst is high enough, these primary photons interact with the infrared background or CMB photons to create electron and positron pairs. These charged particles are then deflected by the existence of extragalactic magnetic fields before emitting secondary gamma-rays via inverse Compton scatterings off CMB photons, so that some photons are delayed to reach the observer compared with the primary photons. By taking into account of the redshift evolution of infrared background, we calculate time-dependent spectra of such delayed emissions from gamma-ray bursts for a wide range of redshift. We find that delayed photons typically have intensity of 10^-5 GeV cm^-2 s^-1 and delayed time of 10^5 s from the gamma-ray burst at z~1. We conclude that extragalactic magnetic fields as weak as 10^-18 gauss can be probed by observing them.
Ichiki Kiyotomo
Inoue Susumu
Takahashi Keitaro
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