The peaks and gaps in the redshift distributions of active galactic nuclei and quasars

Details The peaks and gaps in the redshift distributions of active galactic nuclei and quasars The peaks and gaps in the redshift distributions of active galactic nuclei and quasars

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.193..303k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 193, no. 2, July 1992, p. 303-307.

Astronomy and Astrophysics

Astrophysics

2

Active Galactic Nuclei, Quasars, Radio Galaxies, Red Shift, Seyfert Galaxies, Astronomical Catalogs, Galactic Clusters, Hubble Constant, Line Of Sight

Scientific paper

The distributions f(z) of the redshifts for active galaxies (Seyfert galaxies, radio galaxies, and quasars) are studied. Some statistically-significant maxima and minima are observed in the distributions f(z) for these objects. The significance of peaks and gaps increases for the brighter objects, for which the sample are more complete. The clustering of the Seyfert galaxies is significantly different from that of the nearby normal galaxies. The distribution f(z) for the radio galaxies is similar to the analogous distribution for the galaxy clusters. Three of the five peaks in the distribution f(z) for the radio quasars may be caused by the selection effects. Two peaks within the intervals z (0.5, 0.7) and (1.0, 1.1) are probably real. The corresponding scales of the QSO clustering along the line-of-sight are about 100/h Mpc (h is the Hubble constant in the units of 75 km/s Mpc). The possibility of some global quasi-periodical cycles for the processes of activity is discussed. The period of a cycle for the Seyfert and radio galaxies is about 1 x 10 exp 8 yr, which corresponds to distances of about 30/h Mpc between the shells.

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