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

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Date
11/05/2014
Author
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.
Keywords
Surveys
Galaxies: active
Large-scale structure of Universe
Radio continuum: galaxies
Digital sky survey
Angular-correlation function
Baryon acoustic-oscillations
Spatial correlation-function
2-point correlation-function
Active galactic nuclei
QSO redshift survey
Data release 7
Clustering properties
Herschel-atlas
QB Astronomy
QC Physics
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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 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 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 , vol. 440 , no. 2 , pp. 1527-1541 . https://doi.org/10.1093/mnras/stu354
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu354
ISSN
0035-8711
Type
Journal article
Rights
© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5377

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