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A statistical analysis of the radio properties of a large sample of 374 optically selected quasars

Published online by Cambridge University Press:  19 July 2016

Gopal Krishna ,
H. Steppe ,
T. Ghosh  and
L. Saripalli
Gopal Krishna
Affiliation:
T.I.F.R Centre, P.O. Box 1234, Bangalore 560 012 (India)
H. Steppe
Affiliation:
I.R.A.M., Avd. Divina Pastora 7, Bloque 6/2B, Granada (Spain)
T. Ghosh
Affiliation:
T.I.F.R Centre, P.O. Box 1234, Bangalore 560 012 (India)
L. Saripalli
Affiliation:
T.I.F.R Centre, P.O. Box 1234, Bangalore 560 012 (India)

Abstract

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Using a large, unbiased sample of 374 optically selected QSOs, of which 54 are radio detected, we have computed for different redshift ranges the probability distribution function φ (R) of R defined as the ratio of monochromatic luminosities at 15 GHz and 2500 Å in the QSO's rest frame. A significant variation of φ (R) with redshift is noticed. At small redshifts (z < 0.5), the distinctive feature of φ (R) is a peak near R∼102, arising due to the QSOs having steep radio spectrum(αr<−0.5).

Type
II. Continuum Emission
Information
Symposium - International Astronomical Union , Volume 119: Quasars , 1986 , pp. 111 - 112
Copyright
Copyright © Reidel 1986