A novel mechanism for nonthermal X-ray emission

Details A novel mechanism for nonthermal X-ray emission A novel mechanism for nonthermal X-ray emission

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..723m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 723-731.

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Active Galactic Nuclei, Emission Spectra, Extragalactic Radio Sources, Nonthermal Radiation, Quasars, X Ray Spectra, Brightness Distribution, Computational Astrophysics, Cosmic Rays, Rosat Mission, Synchrotron Radiation

Scientific paper

Diffusive shock acceleration is studied in a sample of hot spots, i.e., high surface-brightness regions at the working end of jets from Fanaroff-Riley type II galaxies or similar knots in jets. It is shown that proton-initiated cascade emission can dominate over synchrotron-self-Compton emission and bremsstrahlung even at X-ray frequencies. In the ROSAT-band the effective spectral index of the total spectrum is alpha(keV) = 0.7 + 0.2 or - 0.1. Contributions to the gamma-ray background emission at a few MeV and close to 100 TeV could be important if hot spots are representative of knots in extragalactic jets.

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