The statistics of radio galaxies and quasars at high redshift.
Abstract
Evidence is now accumulating that the most powerful extragalactic radio sources display a cutoff in comoving density at relatively low redshift. For both radio galaxies and quasars, the luminosity function falls by a factor greater than 3 between z = 2 and 4. The paper describes the data which lead to this conclusion, and discusses the prospects for studying the behavior of low-luminosity active galaxies at high redshift. The strong evolution of highly luminous radio-quiet quasars at z greater than 2 may be an artifact of gravitational lensing.
- Publication:
-
Quasars
- Pub Date:
- 1986
- Bibcode:
- 1986IAUS..119..455P
- Keywords:
-
- Extragalactic Radio Sources;
- Quasars;
- Radio Galaxies;
- Red Shift;
- Active Galaxies;
- Galactic Evolution;
- Gravitational Lenses;
- Luminosity;
- Radio Spectra;
- Statistical Analysis;
- Astrophysics;
- Quasars:Redshifts;
- Quasars:Statistics;
- Radio Galaxies:Redshifts;
- Redshifts:Quasars;
- Redshifts:Radio Galaxies