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Matthew LEHNERT (CRAL, Lyon), who will talk about “A possible stream of accreting cold atomic and molecular gas in the halo of a high redshift radio galaxy”. The cafe-club will take place at 2:00 pm on usual AMU virtual room (link below). The broadcast in the Library at LAM will be confirmed on Wednesday reminder. https://univ-amu-fr.zoom.us/j/96876832544?pwd=NnBaZEdXd3dFUFBRSkRFY05WS1d4dz09 (Meeting ID : 968 7683 2544 — Passcode : 173347) You can find the schedule of upcoming café-clubs and the video of old ones at http://wiki.lam.fr/geco/CafeClub 

 Take care, Carlo, Meriam, Mathilde —————- ABSTRACT I discuss our recent article, https://arxiv.org/abs/2303.17484, on the detection of the fine structure 3P1-3P0 transition of atomic carbon in and around a massive radio galaxy at z=3.8. This transition of neutral carbon is generally emitted in cold dense regions of atomic and molecular gas. One of the interesting features we observe is a filamentary structure that is ~100 kpc in projected length, is narrow, has a velocity gradient of ~600 km/s over its length, and appears to terminate in both projection and velocity at the extended emission in the immediate environment of the radio galaxy. Furthermore, I put this result in context of our previous and on-going work on detecting low surface brightness molecular gas in galaxy halos and proto-intracluster media at high redshifts and in understanding the physics underlying how such gas might arise in halos and streams.