ALMA Finds Dew Drops in the Dusty Spider's Web
B. Gullberg (ESO, MPE, Durham University), M. D. Lehnert (IAP), C. De, Breuck (ESO), S. Branchu (ESO, Universite de Bordeaux), H. Dannerbauer, (Universitaet Wien), G. Drouant (Onsala), B. Emonts (Astrobiolog\'ia), P., Guillard (IAP), N. Hatch (University of Nottingham)

TL;DR
ALMA observations of the Spiderweb Galaxy reveal complex molecular and atomic gas dynamics, including possible dual AGNs, jet-induced cooling, and extensive molecular gas in the halo, providing insights into galaxy evolution at high redshift.
Contribution
This study presents the first spatially-resolved detection of water emission in a high-z galaxy and links radio jet activity to molecular gas formation and cooling processes.
Findings
Detection of strong [CI]2-1 emission at two locations, indicating possible dual AGNs.
First spatially-resolved H2O emission in a high-z galaxy, associated with jet interactions.
Evidence that radio jets induce cooling and molecule formation in the halo gas.
Abstract
We present 0."5 resolution ALMA detections of the observed 246GHz continuum, [CI]^3P_2-^3P_1 fine structure line ([CI]2-1), CO(7-6) and H2O lines in the z=2.161 radio galaxy MRC1138-262, the 'Spiderweb Galaxy'. We detect strong [CI]2-1 emission both at the position of the radio core, and in a second component ~4kpc away from it. The 1100km/s broad [CI]2-1 line in this latter component, combined with its H2 mass of 1.6x10^10Msun implies this emission must come from a compact region <60pc, possibly containing a second AGN. The combined H2 mass derived for both objects using the [CI]2-1 emission is 3.3x10^10Msun. The total CO(7-6)/[CI]2-1 line flux ratio of 0.2 suggests a low excitation molecular gas reservoir and/or enhanced atomic carbon in cosmic-ray dominated regions. We detect spatially-resolved H2O 2_{11}-2_{02} emission - for the first time in a high-z un-lensed galaxy - near the…
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