Virial-shock radio sources in the LoTSS catalog

Following the surprising detection of excess cataloged radio (mainly NVSS) and X-ray sources narrowly confined near the characteristic ∼ 2.4R500 scaled radii of galaxy clusters, we examine the deeper LoTSS radio catalog now available, and stack its sources around up to 226 MCXC clusters. Although our analysis covers only ∼ 8% of the sky, we identify a significant (3.5–4.0σ) narrow signal peaked at ∼ 2.6R500 with properties similar to the NVSS excess, including no strong dependence on cluster mass and redshift. The deeper catalog reveals virial sources of a ∼ uniform 0.4 < α < 0.7 distribution of spectral indices inferred by combining LoTSS with NVSS and RACS.