Absorption of X-rays and gamma rays at cosmological distances

Details Absorption of X-rays and gamma rays at cosmological distances Absorption of X-rays and gamma rays at cosmological distances

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..551z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 15, 1989, p. 551-566.

Astronomy and Astrophysics

Astronomy

69

Baryons, Cosmology, Elementary Particle Interactions, Gamma Ray Astronomy, X Ray Absorption, Background Radiation, Pair Production, Photons, Red Shift

Scientific paper

The absorption of X-rays and gamma-rays in interactions with the cosmic thermal background and baryonic matter at cosmological redshifts is studied. Analytical formulae for the optical depths to photoionization, Compton scattering, photon-matter pair production, photon-photon scattering, and photon-photon single- and double-pair production are derived as functions of redshift and photon energy. The redshift-energy plane is divided into regions of dominance of various absorption processes. In particular, it is found that photon-photon scattering (a process not previously considered in astrophysics) is important for certain ranges of photon energy and redshift.

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