Pair bremsstrahlung radiation from relativistic jets in γ-ray blazars

Details Pair bremsstrahlung radiation from relativistic jets in γ-ray blazars Pair bremsstrahlung radiation from relativistic jets in γ-ray blazars

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302l..17b&link_type=abstract

Astronomy and Astrophysics, v.302, p.L17

Astronomy and Astrophysics

Astrophysics

6

{Gamma}-Rays: Theory, Galaxies: Jets, Galaxies: Active, Radiation Mechanisms: Bremsstrahlung

Scientific paper

The yield of e- e+ and e- e- bremsstrahlung in the hard X-ray and γ-ray regime from leptonic jets in active galactic nuclei is calculated. We argue that in the case of ultrarelativistic jets where the intrinsic particle spectra have lower cutoffs ~>5 the contribution of e- e+ and e- e- bremsstrahlung overwhelms the yield of pair annihilation radiation which poses severe constraints on models trying to explain spectral bumps at MeV energies observed in the γ-ray spectra of many AGNs by a broadened, blue shifted annihilation line from an ultrarelativistic pair plasma. It is demonstrated that bremsstrahlung emission from a power-law distribution of relativistic particles could as well be responsible for spectral breaks Δα>=0.5 at MeV energies with the instantaneous photon spectra having a flat shape (α~1.1 in photon number spectrum) at photon energies well below the break.

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