Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phys...17..347k&link_type=abstract
(Niels Bohr Institut, Teknisk Videnskabelige Forskningsrad, and Nordisk Institut for Teoretisk Atomfysik, Symposium on Quasars a
Astronomy and Astrophysics
Astronomy
8
Astronomical Spectroscopy, Periodic Variations, Quasars, Red Shift, Spatial Distribution, Ultraviolet Astronomy, Emission Spectra, Line Spectra, Radio Astronomy, Ubv Spectra
Scientific paper
The periodicity in the distribution of quasar redshifts, previously found by Karlsson (1971) is explained in terms of selection effects. Special attention is drawn to a selection effect caused by the redshift-dependent influence of the strong emission lines on the limiting magnitude for detecting quasars. This is especially important since the number of quasars increases with a large factor per magnitude. The limiting magnitude effect applies both to spectroscopic and to UV-excess surveys. It is shown that the redshift distribution of quasars selected by a combination of UV-excess information and agreement between radio and optical position is intermediate between the redshift distribution of the two groups of quasars selected by one of the two criteria. It is also shown that the distribution of redshifts for UV-excess selected quasars is very similar to the variation of the ultraviolet excess as a function of redshift. This evidence indicates that strong selection effects are in play.
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