Coffee talks
Thursday 25/06/2026 @ 11:30, Sala riunioni quarto piano e on-line (meet.google.com/sue-bwvk-axf)
Katlego Morakile (University of Pretoria, South Africa), "Bent-tailed Radio Galaxies in the Cosmic Web"
In this talk I present a study of morphologies of bent-tailed radio galaxies residing in the Cosmic Web and how we have used them as probes of ambient diffuse gas. We used sensitive MeerKAT observations part of the L-band (856 - 1712 MHz) MeerKAT Galaxy Cluster Legacy Survey (MGCLS), going down to a surface brightness of 3-5 microJy /beam (for a full resolution of 7-8”) to preselect jetted radio galaxies of winged, asymmetric or bent morphologies as potential indicators of jet/lobe interactions with ambient media. In particular, we found three bent-tailed galaxies residing in a filamentary structure found in redshift surveys. Extending > 57 Mpc, this filamentary structure is (atleast partially composed of galaxy groups strung together) between redshifts of 0.1126 < z < 0.1188. Carrying out measurements of the radio properties of these bent-tailed galaxies we obtain an estimate of the intragroup and intra-filamentary gas part of this filamentary structure. While this is the only second instance of bent-tailed radio galaxies residing in filamentary media as opposed to their perceived favoured home in galaxy clusters, this is a useful technique to probe the Warm-Hot Intergalactic Medium (WHIM), thought to be contained in the filamentary structure of the Cosmic Web.