English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have measured the luminous AGN population in a large sample of clusters ofgalaxies and find evidence for a substantial increase in the cluster AGNpopulation from z~0.05 to z~1.3. The present sample now includes 32 clusters ofgalaxies, including 15 clusters above z=0.4, which corresponds to a three-foldincrease compared to our previous work at high redshift. At z<0.4 we haveobtained new observations of AGN candidates in six additional clusters andfound no new luminous AGN in cluster members. Our total sample of 17low-redshift clusters contains only two luminous AGN, while at high redshiftsthere are 18 such AGN, or an average of more than one per cluster. We havecharacterized the evolution of luminous X-ray AGN as the fraction of galaxieswith M_R < M_R^*(z)+1 that host AGN with rest-frame, hard X-ray [2--10 keV]luminosities L_X,H >= 10^43 \ergs. The AGN fraction increases from f_A =0.134^{+0.18}_{-0.087} percent at a median z=0.19 to f_A = 1.00^{+0.29}_{-0.23}percent at a median z=0.72. Our best estimate of the evolution is a factor ofeight increase to z=1 and the statistical significance of the increase is3.8sigma. This dramatic evolution is qualitatively similar to the evolution ofthe star-forming galaxy population in clusters known as the Butcher-Oemlereffect. We discuss the implications of this result for the coevolution of blackholes and galaxies in clusters, the evolution of AGN feedback, searches forclusters with the Sunyaev-Zel'dovich effect, and the possible detection ofenvironment-dependent downsizing.

The Evolution of Active Galactic Nuclei in Clusters of Galaxies to Redshift 1.3