Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230p...5e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Feb. 1, 1988, p. 5p-11p.
Astronomy and Astrophysics
Astronomy
310
Cosmology, Dark Matter, Galactic Evolution, Quasars, Red Shift, Astronomical Models, Astronomical Spectroscopy
Scientific paper
The relationship between high-redshift quasars and the epoch of galaxy formation in the Cold Dark Matter (CDM) cosmogony is investigated. Luminous quasars could only form after galactic sized systems had collapsed. A constant comoving density of luminous quasars between z = 2 and z = 4 is compatible with the CDM model if quasars are short-lived and radiate at about the Eddington limit. However, according to the CDM model, the abundance of high-luminosity quasars must decline exponentially at higher redshifts. Even if all protogalaxies form quasars and about 1 percent of the baryons within a protogalaxy collapse into a compact object, a steep fall in the density of quasars with L of greater than 10 to the 47th erg/s at redshifts z of greater than about 5 would be expected. The existence of a 'cut-off' in the quasar numbers at high redshift could therefore supply an important test of the CDM theory.
Efstathiou George
Rees Martin J.
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