Absorption of High Energy Gamma-Rays by Low Energy Intergalactic Photons

Details Absorption of High Energy Gamma-Rays by Low Energy Intergalactic Photons Absorption of High Energy Gamma-Rays by Low Energy Intergalactic Photons

1995-01-18

arxiv.org/abs/astro-ph/9501065v1

Space Sci.Rev.75:401-412,1996

Astronomy and Astrophysics

Astrophysics

12 pg., uuencoded, Z-compressed ps file (includes figures), To be published in Space Sci. Rev

Scientific paper

10.1007/BF00195048

Following our previously proposed technique, we have used the recent gamma-ray observations of Mrk 421 to place theoretically significant constraints on and possible estimates of the intergalactic infrared radiation field (IIRF) which are consistent with normal galactic IR production by stars and dust and rule out exotic mechanisms proposed to produce a larger IIRF. Using models for the low energy intergalactic photon spectrum from microwave to UV energies, we calculate the opacity of inter- galactic space to gamma-rays as a function of energy and redshift. These calculations indicate that the GeV gamma-ray burst recently observed by the EGRET experiment on CGRO originates at a redshift less than approximately 1.5.

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