Journal Article

Cosmological evolution of the Fanaroff–Riley type II source population

Yang Wang and Christian R. Kaiser

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 2, pages 677-696
Published in print August 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI:
Cosmological evolution of the Fanaroff–Riley type II source population

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By combining a model for the evolution of the radio luminosity of an individual source with the radio luminosity function, we perform a multidimensional Monte Carlo simulation to investigate the cosmological evolution of the Fanaroff–Riley type II (FR II) radio galaxy population by generating large artificial samples. The properties of FR II sources are required to evolve with redshift in the artificial samples to fit the observations. Either the maximum jet age or the maximum density of the jet environment or both evolve with redshift. We also study the distribution of FR II source properties as a function of redshift. From currently available data we cannot constrain the shape of the distribution of environment density or age, but jet power is found to follow a power-law distribution with an exponent of approximately −2. This power-law slope does not change with redshift out to z= 0.6. We also find the distribution of the pressure in the lobes of FR II sources to evolve with redshift up to z∼ 1.2.

Keywords: methods: statistical; galaxies: evolution; intergalactic medium; galaxies: jets; galaxies: luminosity function, mass function

Journal Article.  14987 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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