The unification of radio galaxies and quasars and their linear size evolution

Details The unification of radio galaxies and quasars and their linear size evolution The unification of radio galaxies and quasars and their linear size evolution

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257...11g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 11-16.

Astronomy and Astrophysics

Astrophysics

18

Galactic Evolution, Quasars, Radio Galaxies, Astronomical Spectroscopy, Luminosity, Red Shift

Scientific paper

Redshift-dependences of the linear sizes of powerful, extended radio sources associated with quasars and radio galaxies are compared using large samples of such objects, drawn from meter-wavelength surveys. Our approach incorporates a correction for the influence of the luminosity-redshift correlation present in flux-limited source samples. This debiasing is done by normalizing the measured radio size of each source to a fixed radio luminosity, using the empirically determined relation between the (projected) linear sizes (l) and luminosities (P) of extended radio sources. Since the median values of l at different redshifts (z) can be substantially affected due to the population of compact-steep-spectrum sources (whose evolution process is complicated by the expected strong interaction with the interstellar medium inside the parent galaxy), we have chosen to focus attention on the behavior of the sources observed near the upper envelope of the l-z diagram. Over a wide range in redshift (0.1 - 2.0), the redshift-dependences of the 'normalized' linear sizes of such quasars and radio galaxies are found to have nearly identical power-law slopes. This implies that, at least, when only the largest radio sources at different redshifts are considered, the cosmological evolutions of linear sizes of quasars and radio galaxies are indistinguishable.

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