scholarly journals Cosmological Evolution of QSOs and Radio Galaxies from Radio — Selected Samples

1982 ◽  
Vol 97 ◽  
pp. 441-449 ◽  
Author(s):  
J. V. Wall ◽  
C. R. Benn
Keyword(s):  
Spatial Distribution ◽  
Radio Galaxies ◽  
Cosmological Evolution ◽  
Recent Advances

We describe recent advances in observation and analysis which lead to improved understanding of the spatial distribution of QSOs and radio galaxies.

scholarly journals Spectral Index - Redshift Relation for Radio Galaxies and Quasars

1996 ◽  
Vol 175 ◽  
pp. 569-570
Author(s):  
R.D. Dagkesamanskii
Keyword(s):  
Flux Density ◽  
Spectral Index ◽  
Low Frequency ◽  
Radio Galaxies ◽  
Cosmological Evolution ◽  
Radio Sources ◽  
Spectral Indices ◽  
Extragalactic Radio Sources

Cosmological evolution of synchrotron spectra of the powerful extragalactic radio sources was studied by many authors. Some indications of such an evolution had been found firstly by analysis of ‘spectral index - flux density’ (α – S) relation for the sample of relatively strong radio sources. Later Gopal-Krishna and Steppe extended the analysis to weaker sources and found that the slope of αmed(S) curve changes dramatically at intermediate flux densities. Gopal-Krishna and Steppe pointed out that the maxima of the αmed(S) curve and of differential source counts are at almost the same flux density ranges (see, Fig. 2). It has to be noticed that the all mentioned results were obtained using the low-frequency spectral indices and on the basis of low frequency samples.

Cosmological Evolution in Radio Galaxies

Nature ◽  
1971 ◽  
Vol 233 (5319) ◽  
pp. 402-403 ◽  
Author(s):  
CRAIG D. MACKAY
Keyword(s):  
Radio Galaxies ◽  
Cosmological Evolution

From observations to physics: Cosmological evolution of radio galaxies

2009 ◽  
Vol 330 (2-3) ◽  
pp. 279-282
Author(s):  
A.D. Kapińska ◽  
C.R. Kaiser
Keyword(s):  
Radio Galaxies ◽  
Cosmological Evolution
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