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Diffuse Radio Sources in a Statistically Complete Sample of High Redshift Galaxy Clusters | | G. Giovannini
; M. Cau
; A. Bonafede
; H. Ebeling
; L. Feretti
; M. Girardi
; M. Gitti
; F. Govoni
; A. Ignesti
; M. Murgia
; G.B. Taylor
; V. Vacca
; | | Date: |
15 Jun 2020 | | Abstract: | Non-thermal properties of galaxy clusters have been studied with detailed and
deep radio images in comparison with X-ray data. While much progress has been
made, most of the studied clusters are at a relatively low redshift (z < 0.3).
We here investigate the evolutionary properties of the non-thermal cluster
emission using two statistically complete samples at z > 0.3. We obtained short
JVLA observations at L-band of the statistically complete sample of very X-ray
luminous clusters from the Massive Cluster Survey (MACS) presented by Ebeling
et al. (2010), and redshift range 0.3 - 0.5. We add to this list the complete
sample of the 12 most distant MACS clusters (z > 0.5) presented in Ebeling et
al. (2007). Most clusters show evidence of emission in the radio regime. We
present the radio properties of all clusters in our sample and show images of
newly detected diffuse sources. A radio halo is detected in 19 clusters, and
five clusters contain a relic source. Most of the brightest cluster galaxies
(BCG) in relaxed clusters show radio emission with powers typical of FRII radio
galaxies, and some are surrounded by a radio mini-halo. The high frequency of
radio emission from the BCG in relaxed clusters suggests that BCG feedback
mechanisms are in place already at z about 0.6. The properties of radio halos
and the small number of detected relics suggest redshift evolution in the
properties of diffuse sources. The radio power (and size) of radio halos could
be related to the number of past merger events in the history of the system. In
this scenario, the presence of a giant and high-power radio halo is indicative
of an evolved system with a large number of past major mergers. | | Source: | arXiv, 2006.8494 | | Services: | Forum | Review | PDF | Favorites | |
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