The Atacama Cosmology Telescope: Measuring radio galaxy bias through cross-correlation with lensing

Rupert Allison, Sam N. Lindsay, Blake D. Sherwin, Francesco De Bernardis, J. Richard Bond, Erminia Calabrese, Mark J. Devlin, Joanna Dunkley, Patricio Gallardo, Shawn Henderson, Adam D. Hincks, Renée Hlozek, Matt Jarvis, Arthur Kosowsky, Thibaut Louis, Mathew Madhavacheril, Jeff Mcmahon, Kavilan Moodley, Sigurd Naess, Laura NewburghMichael D. Niemack, Lyman A. Page, Bruce Partridge, Neelima Sehgal, David N. Spergel, Suzanne T. Staggs, Alexander Van Engelen, Edward J. Wollack

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We correlate the positions of radio galaxies in the FIRST survey with the cosmic microwave background lensing convergence estimated from the Atacama Cosmology Telescope over 470 deg2 to determine the bias of these galaxies. We remove optically cross-matched sources below redshift z = 0.2 to preferentially select active galactic nuclei (AGN). We measure the angular cross-power spectrum Clkg at 4.4σ significance in the multipole range 100 < l < 3000, corresponding to physical scales within ≈2-60 Mpc at an effective redshift zeff = 1.5. Modelling the AGN population with a redshift-dependent bias, the cross-spectrum is well fitted by the Planck best-fitting Λ cold dark matter cosmological model. Fixing the cosmology and assumed redshift distribution of sources, we fit for the overall bias model normalization, finding b(zeff) = 3.5 ± 0.8 for the full galaxy sample and b(zeff) = 4.0 ± 1.1(3.0 ± 1.1) for sources brighter (fainter) than 2.5 mJy. This measurement characterizes the typical halo mass of radio-loud AGN: we find log(Mhalo/M) = 13.6-0.4+0.3.

Original languageEnglish (US)
Pages (from-to)849-858
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Large-scale structure of Universe
  • Radio continuum: galaxies


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