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Space Densities for Powerful Radio Sources in the Light of Unification

Published online by Cambridge University Press:  25 May 2016

C.A. Jackson  and
J.V. Wall
C.A. Jackson
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge, CB3 0HA, UK Royal Greenwich Observatory, Madingley Road, Cambridge, CB3 0EZ, UK
J.V. Wall
Affiliation:
Institute of Astronomy, University of Cambridge, Cambridge, CB3 0HA, UK Royal Greenwich Observatory, Madingley Road, Cambridge, CB3 0EZ, UK

Extract

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As radio survey frequency is raised the proportion of flat-spectrum sources increases in bright flux-limited samples (eg Wall 1994, Aust J Phys47, 625). Differential source counts show a corresponding broadening of the central maximum due to the increasing proportion of flat-spectrum sources. Orr & Browne (1982, MNRAS200, 1067) modelled this change in shape of the source count by proposing a unifying scheme which states that the core-dominated, flat-spectrum radio sources are the steep-spectrum sources with their cores Doppler-boosted due to the alignment of the jets with the line of sight.

Type
Cosmological Implications
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 553 - 554
Copyright
Copyright © Kluwer 1996