Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..688c&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 688-693.
Astronomy and Astrophysics
Astronomy
2
Background Radiation, Cosmology, Diffuse Radiation, Gamma Rays, Relativity, Bl Lacertae Objects, Galactic Evolution, Isotropic Media, Quasars, Radio Astronomy, Seyfert Galaxies
Scientific paper
Bignami et al (1979) have recently studied the problem of the origin of the diffuse gamma-ray isotropic radiation. They have concluded that within standard cosmology with Lambda = 0 and p = 0, BL Lacertae objects and Seyfert galaxies can account for most of the diffuse radiation if they have not evolved in time. For QSOs, an evolutionary factor is allowed by the data. From the study of radio data, however, it is known that strong evolutionary effects are expected. The discrepancy cannot be explained by changing the geometry of the universe. Contrary to the case of standard cosmology, it is found that in order to fit the diffuse gamma-ray background, the evolutionary function required is almost identical to the one previously determined from the study of the log N-log S relation.
Canuto Vittorio M.
Hsieh S. H.
Owen Rochelle J.
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