A plausible link between dynamically unsettled molecular gas and the radio jet in NGC 6328
arXiv:2310.02033 · doi:10.1051/0004-6361/202346464
Abstract
We report the detection of outflowing molecular gas at the center of the nearby radio galaxy NGC6328 (z=0.014), which has a gigahertz-peaked spectrum radio core and a compact (2 pc) young double radio lobe tracing jet. Utilizing Atacama Large Millimeter/submillimeter Array (ALMA) CO(2-1) and CO(3-2) observations, as well as a novel code developed to fit the 3D gas distribution and kinematics, to study the molecular gas kinematics, we find that the bulk of the gas is situated within a highly warped disk structure, most likely the result of a past merger event. Our analysis further uncovers, within the inner regions of the gas distribution (R<300 pc) and at a position angle aligning with that of the radio jet (150 degrees), the existence of two anti-diametric molecular gas structures kinematically detached from the main disk. These structures most likely trace a jet-induced cold gas outflow with a total lower limit mass of mass, corresponding to an outflow rate of and a kinetic power of . The energy required to maintain such a molecular outflow is aligned with the mechanical power of the jet.
19 pages, 13 figures, Accepted for publication in A&
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