Evolution of radio galaxies to Z = 1

Details Evolution of radio galaxies to Z = 1 Evolution of radio galaxies to Z = 1

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..471h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 471-479

Astronomy and Astrophysics

Astronomy

13

Galactic Evolution, Galactic Structure, Quasars, Radio Astronomy, Radio Galaxies, Red Shift, Stellar Luminosity, Astronomical Catalogs, Astronomical Maps, Astronomical Photography, Size Distribution, Very Large Array (Vla)

Scientific paper

We report Very Large Array (VLA) A-configuration studies of a sample of 49 radio galaxies at redshift less than 1. These were selected with no prior knowledge of their morphology and were chosen to match the redshift and luminosity distribution of a previously studied sample of radio-loud quasars. We compare the radio galaxies with the quasar sample and also with a sample of 29 radio galaxies selected for steep spectrum and double-lobe structure. We find that the radio galaxies have more luminous lobes and mostly weaker cores, and there is no population of one-sided sources associated with the galaxies. The radio galaxies' lobe length ratios and lobe power ratios differ from quasars. The overall sizes of the two types of sources are similar, but the radio galaxies have a 3 times larger upper envelope. The distribution of bend angles is similar but the radio galaxies have fewer very bent and straight sources. We discuss these and other comparisons in detail and suggest that while quasars appear to be viewed within a cone and radio galaxies outside it, the two types of source also have intrinsic differences, and both have individual growth and evolution scenarios. This is supported by previously observed differences in optical properties between the two source types.

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