The Massive and Distant Clusters of WISE Survey. VIII. Radio Activity in Massive Galaxy Clusters
Abstract
We present a study of the central radio activity of galaxy clusters at high redshift. Using a large sample of galaxy clusters at 0.7 < z < 1.5 from the Massive and Distant Clusters of Wide-field Infrared Survey Explorer Survey and the Faint Images of the Radio Sky at Twenty-Centimeters 1.4 GHz catalog, we measure the fraction of clusters containing a radio source within the central 500 kpc, which we term the cluster radio-active fraction, and the fraction of cluster galaxies within the central 500 kpc exhibiting radio emission. We find tentative (2.25σ) evidence that the cluster radio-active fraction increases with cluster richness, while the fraction of cluster galaxies that are radioluminous ( ${L}_{1.4\mathrm{GHz}}\geqslant {10}^{25}$ W Hz-1) does not correlate with richness at a statistically significant level. Compared to that calculated at 0 < z < 0.6, the cluster radio-active fraction at 0 < z < 1.5 increases by a factor of 10. This fraction is also dependent on the radio luminosity. Clusters at higher redshift are much more likely to host a radio source of luminosity ${L}_{1.4\mathrm{GHz}}\gtrsim {10}^{26}$ W Hz-1 than are lower-redshift clusters. We compare the fraction of radioluminous cluster galaxies to the fraction measured in a field environment. For 0.7 < z < 1.5, we find that both the cluster and field radioluminous galaxy fraction increases with stellar mass, regardless of environment, though at fixed stellar mass, cluster galaxies are roughly 2 times more likely to be radioluminous than field galaxies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2020
- DOI:
- 10.3847/1538-4357/abb08d
- arXiv:
- arXiv:2008.07686
- Bibcode:
- 2020ApJ...901..131M
- Keywords:
-
- Active galactic nuclei;
- Extragalactic radio sources;
- High-redshift galaxy clusters;
- Galaxy clusters;
- Galaxy evolution;
- 16;
- 508;
- 2007;
- 584;
- 594;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 12 pages, 6 figures, accepted to ApJ