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

Allison, R., Lindsay, S. N., Sherwin, B. D., de Bernardis, F., Bond, J. R., Calabrese, Erminia, Devlin, M. J., Dunkley, J., Gallardo, P., Henderson, S., Hincks, A. D., Hlozek, R., Jarvis, M., Kosowsky, A., Louis, T., Madhavacheril, M., McMahon, J., Moodley, K., Naess, S., Newburgh, L., Niemack, M. D., Page, L. A., Partridge, B., Sehgal, N., Spergel, D. N., Staggs, S. T., van Engelen, A. and Wollack, E. J. 2015. The Atacama Cosmology Telescope: measuring radio galaxy bias through cross-correlation with lensing. Monthly Notices of the Royal Astronomical Society 451 (1) , pp. 849-858. 10.1093/mnras/stv991

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Abstract

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 Cκg l 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 � 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+0.3 −0.4.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 00358711
Date of First Compliant Deposit: 7 September 2017
Date of Acceptance: 1 May 2015
Last Modified: 07 Sep 2017 09:28
URI: http://orca.cf.ac.uk/id/eprint/104421

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