The cosmological evolution of quasars

Details The cosmological evolution of quasars The cosmological evolution of quasars

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17r.135s&link_type=abstract

(Neils Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a

Astronomy and Astrophysics

Astronomy

23

Cosmology, Evolution (Development), Quasars, Radio Astronomy, Magnitude, Radio Spectra, Red Shift, Space Density, Universe

Scientific paper

There is compelling evidence that quasars, both optically selected and
radio selected ones, exhibit strong cosmological evolution. If the space
density is an exponential of cosmic time, then the characteristic time
of decline is one-tenth of the age of the Universe. Quasars with flat
radio spectrum appear to show less cosmological evolution.

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