Probable spectral steepening of UHE gamma-rays of nuclear origin and its consequences

Details Probable spectral steepening of UHE gamma-rays of nuclear origin and its consequences Probable spectral steepening of UHE gamma-rays of nuclear origin and its consequences

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994japa...15..179m&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 15, no. 2, p. 179-186

Astronomy and Astrophysics

Astrophysics

Cosmic Rays, Gamma Rays, Particle Acceleration, Emissivity, Magnetopause, Optical Thickness, Stellar Magnetospheres

Scientific paper

Recent accelerator data based parameterization of the inclusive cross section (c - s) for pi0 production in hadronic collisions and an explicit incorporation of the finiteness of the relevant projectile hadron spectrum suggest a significant steepening in the spectrum (by as much as 0.4 in the spectral index) of the secondary gamma-ray towards the end of the spectrum. We emphasize here that this spectral steepening in conjunction with the possibility that in the bright X-ray binaries the maximum energy to which the gamma-ray producing progenitor protons may be accelerated is only approximately 10 PeV, may imply an effective efficiency for gamma-ray production, epsilon, as reckoned by the PeV arrays, one or two orders smaller than the previous estimates. To explain the genesis of a given PeV photon flux from an X-ray binary, one, therefore, has to accordingly consider a much higher value of the progenitor proton beam luminosity, Lp. This requirement may raise further questions regarding the actual genesis of PeV gamma-rays in X-ray binaries, or alternatively, on the veracity of the high values of the PeV photon fluxes reported by earlier experiments.

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