Space distribution of extragalactic sources - Cosmology versus evolution

Details Space distribution of extragalactic sources - Cosmology versus evolution Space distribution of extragalactic sources - Cosmology versus evolution

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358....1c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 1-4. Research supported by MURST and CNR.

Other

2

Active Galactic Nuclei, Cosmology, Galactic Clusters, X Ray Sources, Red Shift, Space-Time Functions, Spatial Distribution

Scientific paper

Alternative cosmologies have been recurrently invoked to explain in terms of global spacetime structure the apparent large increase, with increasing redshift, in the average luminosity of active galactic nuclei. These models interestingly seek to avoid the complexities of the canonical interpretation in terms of intrinsic population evolutions in a Friedmann universe. However, a problem of consistency for these cosmologies is pointed out, since they have to include also other classes of extragalactic sources, such as clusters of galaxies and BL Lac objects, for which there is preliminary evidence of a different behavior.

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