Gas-Poor Hosts and Gas-Rich Companions of $zapprox$3.5 Radio AGN: ALMA insights into jet triggering and feedback
Wuji Wang, Carlos De Breuck, Dominika Wylezalek, Matthew D. Lehnert, Andreas L. Faisst, Andrey Vayner, Nicole Nesvadba, Jo"el Vernet, Pranav Kukreti, Daniel Stern
arXiv:2506.10799v2 Announce Type: replace
Abstract: Cold gaseous systems play important roles in galaxy evolution by possibly providing fuel to ignite active galactic nuclei (AGN) activity and star-formation. In this work, we analyze [CII]$158rm mu m$ and continuum observations from ALMA for a sample of four radio AGN at $z approx 3.5$, focusing on eight associated companion cloud systems discovered within projected distances of tens of kiloparsecs or less. The spatial distribution of these companions indicates that the majority of cold gas is not located at the AGN position, i.e., not in their host galaxies. With the assistance of [CII] at 0.2″ resolution, we further confirm the gas-poor nature of the hosts by re-analyzing archival [CI] (a tracer of H$_{2}$) at $sim2″$ resolution. Our sample has [CII] luminosities in a range of $2.8times10^{8}
Abstract: Cold gaseous systems play important roles in galaxy evolution by possibly providing fuel to ignite active galactic nuclei (AGN) activity and star-formation. In this work, we analyze [CII]$158rm mu m$ and continuum observations from ALMA for a sample of four radio AGN at $z approx 3.5$, focusing on eight associated companion cloud systems discovered within projected distances of tens of kiloparsecs or less. The spatial distribution of these companions indicates that the majority of cold gas is not located at the AGN position, i.e., not in their host galaxies. With the assistance of [CII] at 0.2″ resolution, we further confirm the gas-poor nature of the hosts by re-analyzing archival [CI] (a tracer of H$_{2}$) at $sim2″$ resolution. Our sample has [CII] luminosities in a range of $2.8times10^{8}
2025-07-04
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