Published July 1990 | Version v1
Journal article Metadata-only

The cosmological evolution models of active galaxies and the extragalactic gamma-ray background

Creators

  • 1. NASA, Goddard Space Flight Center, Greenbelt, MD (USA)
  • 2. California Univ., Los Angeles (USA)
  • 3. California Univ., Los Angeles and Santa Barbara (USA)

Description

The source spectra and angular fluctuations produced by various possible models of AGN evolution derived from observations in other wavelength bands are investigated. It is found that the sizes of the angular fluctuations are roughly constant between 10 and 100 MeV, independent of the models chosen. None of the models produce the spectral shelf observed at a few MeV, and from the simulation, the AGN mechanism is only a minor contributor to the extragalactic gamma-ray background (EGB), with its flux only about 10 percent of what is observed. These evolution-independent effects imply that the EGB is not solely produced by the AGN mechanism. 34 refs

Additional details

Publishing Information

Journal Title
Astrophysical Journal
Journal Volume
357
Series
Astrophys. J.
Journal Page Range
L1-L4
ISSN
0004-637X
CODEN
ASJOA

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
22001331
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Descriptors DEI
BACKGROUND RADIATION; COSMIC PHOTONS; COSMIC RADIO SOURCES; COSMOLOGICAL MODELS; COSMOLOGY; ENERGY SPECTRA; GALACTIC EVOLUTION; GALAXY NUCLEI; GAMMA ASTRONOMY; ORIGIN; QUASARS; SEYFERT GALAXIES
Descriptors DEC
ASTRONOMY; BOSONS; COSMIC RADIATION; ELEMENTARY PARTICLES; GALAXIES; IONIZING RADIATIONS; MASSLESS PARTICLES; MATHEMATICAL MODELS; PHOTONS; RADIATIONS; SPECTRA