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.

12 pages, 7 figures, Accepted for publication in MNRAS

References in corpus (18)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• EAZY: A Fast, Public Photometric Redshift Code
• Radio sources in the 6dFGS: Local luminosity functions at 1.4 GHz for star-forming galaxies and radio-loud AGN
• On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
• The Subaru/XMM-Newton Deep Survey (SXDS) - II. Optical Imaging and Photometric Catalogs
• Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-microJy catalogue, optical identifications, and the nature of the faint radio source population
• The evolution of the near-IR galaxy Luminosity Function and colour bimodality up to z ~ 2 from the UKIDSS Ultra Deep Survey Early Data Release
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• The spatial clustering of X-ray selected AGN in the XMM-COSMOS field
• The role of AGN in the colour transformation of galaxies at redshifts z~1
• The Spatial Clustering of ROSAT All-Sky Survey AGNs II. Halo Occupation Distribution Modeling of the Cross Correlation Function
• The Spatial Clustering of ROSAT All-Sky Survey AGN: I. The cross-correlation function with SDSS Luminous Red Galaxies
• The clustering of radio galaxies at z~0.55 from the 2SLAQ LRG survey
• Environmental dependence of AGN activity in the supercluster A901/2
• The clustering and abundance of star-forming and passive galaxies at $z\sim 2$
• The evolution of galaxy clustering since z = 3 using the UKIDSS Ultra Deep Survey: the divergence of passive and star-forming galaxies
• Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9
• Why are AGN found in High Mass Galaxies?

Cited by in corpus (25)

• What Drives the Growth of Black Holes?
• The DEEP3 Galaxy Redshift Survey: The Impact of Environment on the Size Evolution of Massive Early-type Galaxies at Intermediate Redshift
• High velocity outflows from young star-forming galaxies in the UKIDSS Ultra-Deep Survey
• The Milky Way Project: A statistical study of massive star formation associated with infrared bubbles
• Correlation between Galaxy Mergers and Luminous AGN
• Clustering, Bias and the Accretion Mode of X-ray selected AGN
• Enhancement of AGN in a protocluster at z=1.6
• The Milky Way Project: Leveraging Citizen Science and Machine Learning to Detect Interstellar Bubbles
• The statistics of triggered star formation: an overdensity of massive YSOs around Spitzer bubbles
• A tale of two feedbacks: star-formation in the host galaxies of radio-AGN
• The Dependence of AGN Activity on Environment in SDSS
• The Milky Way Project and ATLASGAL: The distribution and physical properties of cold clumps near infrared bubbles
• Classification and environmental properties of X-ray selected point-like sources in the XMM-LSS field
• Probing the Cosmic X-ray and MeV Gamma-ray Background Radiation through the Anisotropy
• The effect of environment on AGN activity: the properties of radio and optical AGN in void, isolated and group galaxies
• A statistical study of gaseous environment of Spitzer interstellar bubbles
• The clustering of X-ray AGN at 0.5 < z < 4.5: host galaxies dictate dark matter halo mass
• The location, clustering, and propagation of massive star formation in giant molecular clouds
• Properties of Galaxies around AGNs with Most Massive Supermassive Black Hole Revealed by the Clustering Analysis
• The Infrared Medium-Deep Survey II: How to Trigger Radio-AGN? Hints from Their Environments
• XXL Survey XXI. The environment and clustering of X-ray AGN in the XXL-South field
• Clustering of galaxies around AGN in the HSC Wide survey
• On the Effects of Local Environment on Active Galactic Nucleus (AGN) in the Horizon Run 5 Simulation
• Properties of environment around AGN and luminous galaxy pairs through HSC wide survey
• Clustering and physical properties of AGN and Star-Forming Galaxies at fixed stellar mass: does assembly bias have a role in AGN activity?