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.
Original language | English |
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Pages (from-to) | 1527-1541 |
Number of pages | 15 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 440 |
Issue number | 2 |
Early online date | 23 Mar 2014 |
DOIs | |
Publication status | Published - 11 May 2014 |
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