Compact steep spectrum sources and linear size evolution

Details Compact steep spectrum sources and linear size evolution Compact steep spectrum sources and linear size evolution

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..452o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 452-454.

Astronomy and Astrophysics

Astrophysics

4

Compact Galaxies, Quasars, Radio Galaxies, Red Shift, Dimensions, Distance

Scientific paper

It is shown that the fraction f(css) of compact steep spectrum (CSS) galaxies in a combined sample by Peacock and Wall (1981) and Wall and Peacock (1985) increases with a redshift greater than 0.2 according to the relation f(css) varies as (1 + Z) exp 2.1, with a cutoff for Z of less than 0.2. The fraction of CSS quasars remains fairly constant with redshift. It is concluded that for galaxies, the variation of f(css) with Z could give rise to the effect of linear size evolution in the angular diameter-redshift relation for an inhomogeneous sample, whereas for quasars nonrandom orientation can give rise to the same effect. The variation of f(css) with Z is explained in terms of the expansion into the interstellar medium of sources in an early stage of their development.

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