Active galaxies and the diffuse gamma-ray background

Details Active galaxies and the diffuse gamma-ray background Active galaxies and the diffuse gamma-ray background

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..228k&link_type=abstract

Nature, vol. 302, Mar. 17, 1983, p. 228-230.

Astronomy and Astrophysics

Astronomy

19

Active Galaxies, Astronomical Models, Black Holes (Astronomy), Galactic Nuclei, Galactic Radiation, Gamma Rays, Electron Emission, Heao 2, Pair Production, Photons, Pions, Power Spectra, Relativistic Particles, X Ray Spectra

Scientific paper

Active galaxies are shown to account for the observed gamma ray background radiation if a steepening of the spectra above about 100 keV is present. An analytical model is discussed in which protons undergo Fermi acceleration at a shock in a spherical accretion flow onto a massive black hole. Relativistic protons with power law spectra, nuclear interactions producing gamma rays from neutal pion decay and electrons from pion-mu meson-electron decay, with a power law spectrum above several hundred MeV, synchrotron and inverse Compton losses steepening the electron spectrum, a photon spectrum close to the pion gamma spectrum and a high-energy gamma ray spectrum steepened by photon-photon pair production interactions with X rays are covered in the model. Comparisons are made with HEAO 2 data on active galaxies, which have estimated luminosities and radii consistent with the compactness necessary for producing the steepening predicted by the model. The active galaxies spectra would be described by a spherical accretion-shock model.

Affiliated with

Also associated with

No associations

Rating

Active galaxies and the diffuse gamma-ray background does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Active galaxies and the diffuse gamma-ray background, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active galaxies and the diffuse gamma-ray background will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1470183