Using High Energy Photons to Determine the Flux and Spectrum of Intergalactic Radiation from Galaxies

Details Using High Energy Photons to Determine the Flux and Spectrum of Intergalactic Radiation from Galaxies Using High Energy Photons to Determine the Flux and Spectrum of Intergalactic Radiation from Galaxies

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..apr.s6005s&link_type=abstract

American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.

Astronomy and Astrophysics

Astronomy

Scientific paper

During the past decade, γ-ray astronomers using the Compton Gamma Ray Observatory and ground based atmospheric Cherenkov detectors have discovered that blazars, active galactic nuclei with their relativistic jets beamed in our direction, produce large fluxes of high energy γ-rays with spectra in some cases extending to multi-TeV energies. Pair production interactions of such high energy γ-rays with intergalactic low energy photons will annihilate them. We have suggested that pair-production absorption cutoff features at the high energy end of blazar γ-ray spectra and γ-ray burst spectra can be used to determine the low energy intergalactic radiation fields at all redshifts at which these sources are found. These results, in turn, can yield valuable information about the past evolution of galaxies. I will discuss the results obtained so far using this technique and critically compare these results with theoretical predictions and direct observational studies of the present-day extragalactic infrared background radiation.

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