University of Hertfordshire

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From the same journal

Radio-AGN Feedback: When the Little Ones were Monsters

Research output: Contribution to journalArticle


  • W. L. Williams
  • H. J. A. Röttgering
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Original languageEnglish
Pages (from-to)1538-1545
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Early online date25 Apr 2015
Publication statusPublished - 21 Jun 2015


We present a study of the evolution of the fraction of radio-loud active galactic nuclei (AGN) as a function of their host stellar mass. We make use of two samples of radio galaxies: one in the local universe, $0.01 10^{24}$ W/Hz at z ~ 1-2 while the radio-loud fraction for higher mass galaxies ($M_* > 10^{11.25}$ M$_{\odot}$) remains the same. We argue that this increase is driven largely by the increase in cold or radiative mode accretion with increasing cold gas supply at earlier epochs. The increasing population of low mass Radio-Loud AGN can thus explain the upturn in the Radio Luminosity Function (RLF) at high redshift which is important for understanding the impact of AGN feedback in galaxy evolution.


This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

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