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CSS versus Large Size Sources

Published online by Cambridge University Press:  25 May 2016

R. Fanti  and
R. E. Spencer
R. Fanti
Affiliation:
1 Istituto di Radioastronomia del CNR, Bologna
R. E. Spencer
Affiliation:
2 Nuffield Radio Astronomy Laboratories, University of Manchester, Jodrell Bank

Extract

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A large fraction of the sources in flux density limited radio samples have angular sizes < 2 arcsec (and hence projected linear sizes ≤ 10–15 kpc for H 0 = 100 Km/(sec Mpc), and steep (α > 0.5, S∝ v –α) high frequency spectra (Kapahi, 1981; Peacock and Wall 1982). The proportion of these Compact Steep–spectrum Sources (CSSs) is high (15–30% depending on the selection frequency) amongst distant (z > 0.2) radio sources of high power, both galaxies and quasars. We include in this class the GHz Peaked Spectrum Radio Sources (GPS), sub–kpc objects whose radio spectra are peaked at GHz frequencies (see, e.g., O'Dea et al, 1991).

Type
Properties of Radio Sources
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 63 - 66
Copyright
Copyright © Kluwer 1996 

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