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Radio Structures of the MRC 1-Jy Sources and the Unification of Radio Galaxies and Quasars

Published online by Cambridge University Press:  25 May 2016

V. K. Kapahi ,
R. M. Athreya ,
C. R. Subrahmanya ,
P. J. Mccarthy ,
W. Van BREUGEL ,
J. C. Baker  and
R.W. Hunstead
V. K. Kapahi
Affiliation:
1 NCRA–TIFR, P. Bag 3, Ganeshkhind, Pune-411001, India
R. M. Athreya
Affiliation:
1 NCRA–TIFR, P. Bag 3, Ganeshkhind, Pune-411001, India
C. R. Subrahmanya
Affiliation:
1 NCRA–TIFR, P. Bag 3, Ganeshkhind, Pune-411001, India
P. J. Mccarthy
Affiliation:
2 OCIW, 813 Santa Barbara St., Pasadena, Ca 91107, USA
W. Van BREUGEL
Affiliation:
3 IGPP, LLNL, Livermore, Ca 94550, USA
J. C. Baker
Affiliation:
4 MRAO, Madingley Road, Cambridge CB3 0HE, UK
R.W. Hunstead
Affiliation:
5 Astrophy. Dept., University of Sydney, NSW2006, Australia

Extract

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The viewing angle of ≃45° (between the jet axis and the line of sight) dividing quasars and radio galaxies in the orientation-based unified scheme (Barthel 1989) is based largely on the observation that in the redshift range of 0.5 < z < 1.0 in the low-frequency 3CRR sample, there are about twice as many radio galaxies than quasars and the median linear size of galaxies is about twice that of the quasars. The relative numbers and sizes of quasars in other redshift ranges in the 3CRR are however in conflict with the simple unified scheme even if the opening angle is considered to evolve with epoch or radio luminosity (Kapahi 1990; Singal 1993). Larger sources samples, preferably selected at low radio frequencies, are clearly important in such statistical studies.

Type
Unification Issues
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 393 - 394
Copyright
Copyright © Kluwer 1996 

References

Barthel, P.D. (1989) Ap.J. , Vol. 336, 606.CrossRefGoogle Scholar
Kapahi, V.K. (1990) in ‘Parsec-scale Radio Jets’ (Eds. Zensus, J.A. & Pearson, T.J.), Cambridge Univ. Press, p304.Google Scholar
Kapahi, V.K. et al. (1990) The MRC 1-Jy sample of Radio Galaxies – This volume. Google Scholar
Singal, A.K. (1993) MNRAS , Vol. 263, 139.CrossRefGoogle Scholar