The MeerKAT Galaxy Clusters Legacy Survey: star formation in massive clusters at 0.15 < z < 0.35

• DOI: 10.1093/mnras/stac3293
• Publication Date: 2022-11-17T03:23:45Z
• Authors: K C Kesebonye; M Hilton; K Knowles; W D Cotton; T E Clarke; S I Loubser; K Moodley; S P Sikhosana
• Keywords: Stellar mass

Abstract We investigate dust-unbiased star formation rates (SFRs) as a function of the environment in 20 massive clusters ($M_{200}\gt 4\times 10^{14}\, {\rm M}_{\odot }$) between 0.15 < $z$ 0.35 using radio luminosities (L1.4GHz) from recently released MeerKAT Galaxy Cluster Legacy Survey catalogue. use optical data Dark Energy Camera to estimate photo-$z$s and assign cluster membership. observe steady decline fraction (fSF) star-forming galaxies 2R200 centres our full sample, but notice significant difference fSF gradients hosting large-scale extended emission form haloes relics (associated with ongoing merger activity) non-radio-halo/relic clusters. For within R200, (0.148 ± 0.016) is $\approx 23{{\ \rm per\ cent}}$ higher than (0.120 0.011). 3σ total SFR normalized by mass for (21.5 1.9 M⊙yr−1/1014M⊙) (26.1 1.4 M⊙yr−1/1014M⊙). There ≈4× above luminous infrared (LIRGs) limit at redshift slice, corresponding 2 Gyr lookback time. This consistent rapid SF activity decreasing amongst LIRGs seen previous studies infrared-derived SFR.