1 research outputs found
The MeerKAT Galaxy Clusters Legacy Survey: star formation in massive clusters at 0.15 < z < 0.35
We investigate dust-unbiased star formation rates (SFR) as a function of the
environment in 20 massive clusters ()
between using radio luminosities () from the
recently released MeerKAT Galaxy Cluster Legacy Survey catalogue. We use
optical data from the Dark Energy Camera Legacy Survey to estimate photo-s
and assign cluster membership. We observe a steady decline in the fraction
() of star-forming galaxies from to the cluster centres
in our full cluster sample, but notice a significant difference in
gradients between clusters hosting large-scale extended radio emission in the
form of haloes and relics (associated with ongoing merger activity) and
non-radio-halo/relic hosting clusters. For star-forming galaxies within
, the in clusters hosting radio haloes and relics
() is higher than in non-radio-halo/relic hosting
clusters (). We observe a difference between the total
SFR normalised by cluster mass for non-radio-halo/relic hosting clusters
( Myr/M) and for clusters with
radio haloes and relics (
Myr/M). There is a decline
in the mass normalised total SFR of clusters for galaxies with SFR above the
luminous infrared galaxies (LIRGs) SFR limit at our redshift slice,
corresponding to 2 Gyr in look-back time. This is consistent with the rapid
decline in SF activity with decreasing redshift amongst cluster LIRGs seen by
previous studies using infrared-derived SFR.Comment: 13 pages, 9 figures. To be published in MNRA