Galaxy and Mass Assembly: the evolution of bias in the radio source population to z∼1.5

Lindsay, S.N.; Jarvis, M.J.; Santos, M.G.; Brown, M.J.I.; Croom, S.M.; Driver, S.P.; Hopkins, A.M.; Liske, J.; Loveday, J.; Norberg, P.; Robotham, A.S.G.

doi:10.1093/mnras/stu354

Galaxy and Mass Assembly: the evolution of bias in the radio source population to z∼1.5

Lindsay, S.N.; Jarvis, M.J.; Santos, M.G.; Brown, M.J.I.; Croom, S.M.; Driver, S.P.; Hopkins, A.M.; Liske, J.; Loveday, J.; Norberg, P.; Robotham, A.S.G.

Authors

S.N. Lindsay

M.J. Jarvis

M.G. Santos

M.J.I. Brown

S.M. Croom

S.P. Driver

A.M. Hopkins

J. Liske

J. Loveday

Professor Peder Norberg peder.norberg@durham.ac.uk
Professor

A.S.G. Robotham

Abstract

We present a large-scale clustering analysis of radio galaxies in the Very Large Array Faint Images of the Radio Sky at Twenty-cm survey over the Galaxy and Mass Assembly (GAMA) survey area, limited to S1.4 GHz > 1 mJy with spectroscopic and photometric redshift limits up to r < 19.8 and <22 mag, respectively. For the GAMA spectroscopic matches, we present the redshift space and projected correlation functions, the latter of which yielding a correlation length r0 ∼ 8.2 h−1 Mpc and linear bias of ∼1.9 at z ∼ 0.34. Furthermore, we use the angular two-point correlation function w(θ) to determine spatial clustering properties at higher redshifts. We find r0 to increase from ∼6 to ∼14 h−1 Mpc between z = 0.3 and 1.55, with the corresponding bias increasing from ∼2 to ∼10 over the same range. Our results are consistent with the bias prescription implemented in the SKA Design Study simulations at low redshift, but exceed these predictions at z > 1. This is indicative of an increasing (rather than fixed) halo mass and/or active galactic nuclei fraction at higher redshifts or a larger typical halo mass for the more abundant Fanaroff and Riley Class I sources.

Citation

Lindsay, S., Jarvis, M., Santos, M., Brown, M., Croom, S., Driver, S., …Robotham, A. (2014). Galaxy and Mass Assembly: the evolution of bias in the radio source population to z∼1.5. Monthly Notices of the Royal Astronomical Society, 440(2), 1527-1541. https://doi.org/10.1093/mnras/stu354

Journal Article Type	Article
Publication Date	May 1, 2014
Deposit Date	Jun 3, 2014
Publicly Available Date	Jul 3, 2014
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	440
Issue	2
Pages	1527-1541
DOI	https://doi.org/10.1093/mnras/stu354
Keywords	Surveys, Galaxies: active, Large-scale structure of Universe, Radio continuum: galaxies.

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.