Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 395, Issue 1, Pages 11-27Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.14513.x
Keywords
galaxies: active; galaxies: clusters: general; radio continuum: galaxies; X-rays: galaxies; X-rays: galaxies: clusters
Categories
Funding
- STFC
- W. M. Keck Foundation
- Science and Technology Facilities Council [PP/E001149/1, ST/G002630/1] Funding Source: researchfish
- STFC [PP/E001149/1, ST/G002630/1] Funding Source: UKRI
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We discuss the optical properties, X-ray detections and active galactic nucleus (AGN) populations of four clusters at z similar to 1 in the Subaru-XMM Deep Field (SXDF). The velocity distribution and plausible extended X-ray detections are examined, as well as the number of X-ray point sources and radio sources associated with the clusters. We find that the two clusters that appear virialized and have an extended X-ray detection contain few, if any, AGN, whereas the two pre-virialized clusters have a large AGN population. This constitutes evidence that the AGN fraction in clusters is linked to the clusters' evolutionary stage. The number of X-ray AGN in the pre-virialized clusters is consistent with an overdensity of a factor of similar to 200; the radio AGN appear to be clustered with a factor of 3 to 6 higher. The median K-band luminosities of L-K = 1.7 +/- 0.7 L* for the X-ray sources and L-K = 2.3 +/- 0.1 L* for the radio sources support the theory that these AGN are triggered by galaxy interaction and merging events in sub-groups with low internal velocity distributions, which make up the cluster environment in a pre-virialization evolutionary stage.
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