AGN environments at z<1.5 in the UKIDSS Ultra-Deep Survey
Abstract
We investigate the environments of both X-ray and radio-loud AGN within the UKIDSS Ultra-deep Survey (UDS) using deep infrared selection to sample the galaxy density field in the redshift range 1.0 <= z <= 1.5. Using angular cross-correlation techniques we find that both X-ray and radio-loud AGN preferentially reside in overdense environments. We also find that both types of AGN cluster more strongly with those galaxies classified as `passive' rather than those that are actively star-forming. We infer clustering scale lengths comparable to those of passive red galaxies, suggesting that typical AGN at these epochs reside in dark-matter halos of mass M >~ 10^13 M_sun. A closer look at the small-scale environments of the AGN reveals that the neighbouring galaxies of radio-loud AGN have U-B colours more skewed towards the `green-valley' and the red sequence, whereas the neighbours of X-ray AGN show no difference to the general galaxy population. This suggests that although both AGN types live in overdense environments, the radio-loud AGN may be preferentially located in more evolved cluster cores, in a similar environment to low-powered radio AGN in the local Universe.
Cite
@article{arxiv.1104.2904,
title = {AGN environments at z<1.5 in the UKIDSS Ultra-Deep Survey},
author = {E. J. Bradshaw and O. Almaini and W. G. Hartley and R. W. Chuter and C. Simpson and C. J. Conselice and J. S. Dunlop and R. J. McLure and M. Cirasuolo},
journal= {arXiv preprint arXiv:1104.2904},
year = {2015}
}
Comments
12 pages, 7 figures, Accepted for publication in MNRAS