The linear bias of radio galaxies at z~0.3 via cosmic microwave background lensing

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Abstract

We present a new measurement of the linear bias of radio loud active galactic nuclei (RLAGN) at $z\approx0.3$ and $L_{\rm 1.4GHz}>10^{23}\,{\rm W\,Hz^{-1}}$ selected from the Best & Heckman (2012) sample, made by cross-correlating the RLAGN surface density with a map of the convergence of the weak lensing field of the cosmic microwave background from Planck. We detect the cross-power signal at a significance of $3\sigma$ and use the amplitude of the cross-power spectrum to estimate the linear bias of RLAGN, $b=2.5 \pm 0.8$, corresponding to a typical dark matter halo mass of $\log_{10}(M_{\rm h} /h^{-1} M_\odot)=14.0^{+0.3}_{-0.5}$. When RLAGN associated with optically-selected clusters are removed we measure a lower bias corresponding to $\log_{10}(M_{\rm h} /h^{-1} M_\odot)=13.7^{+0.4}_{-1.0}$. These observations support the view that powerful RLAGN typically inhabit rich group and cluster environments.
Original languageEnglish
Pages (from-to)L1-L5
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume485
Issue number1
Early online date23 Feb 2019
DOIs
Publication statusPublished - 26 Feb 2019

Keywords

  • astro-ph.GA
  • astro-ph.CO
  • large-scale structure of Universe
  • galaxies:active
  • galaxies:haloes
  • gravitational lensing:weak

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