Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229...93a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 93-98.
Astronomy and Astrophysics
Astrophysics
14
Galaxies, Gravitational Lenses, Quasars, Astronomical Models, Brightness Distribution, Magnitude, Red Shift
Scientific paper
Excess numbers of quasars around lower redshifts galaxies have been interpreted as due to gravitational lensing of background quasars. In order to explain in this way observed excesses around galaxies, a rapid increase in quasar number with fainter apparent magnitude is required. It is shown in the present paper that the directly observed numbers of quasars, except for the brightest, sparsest apparent magnitudes, show far too slow an increase to be compatible with gravitational lensing. On the other hand if the quasars are physically associated with low redshift galaxies then their log N vs. apparent magnitude distribution should match that of these same Sb galaxies. It is shown that the two unusual distributions match almost identically.
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