10 pc Scale Circumnuclear Molecular Gas Imaging of Nearby AGNs
Satoki Matsushita (ASIAA)

TL;DR
This study uses high-resolution imaging of molecular gas in nearby AGNs to explore how gas distribution and kinematics relate to AGN activity, revealing diverse behaviors at 10-100 pc scales.
Contribution
First detailed high-resolution images of circumnuclear molecular gas in multiple nearby AGNs across 10-100 pc scales, examining their kinematics and physical conditions.
Findings
Molecular gas shows smooth rotation at 100 pc scale.
Abnormal line ratios suggest active heating or chemical processes.
Kinematics at 10 pc scale vary, with some disturbed by jets.
Abstract
We present the images and kinematics of circumnuclear molecular gas from 100 pc scale down to 10 pc scale in nearby active galactic nuclei (AGNs) using the Submillimeter Array (SMA) and the Plateau de Bure Interferometer (PdBI). We have observed several nearby galaxies that host AGNs, such as the nearest radio galaxy Centaurus A (NGC 5128), the Seyfert 2 galaxy M51 (NGC 5194), the Seyfert 2 galaxy NGC 1068, the Seyfert 1 galaxy NGC 1097, and the Seyfert 2 / starburst composite galaxy NGC 4945, in CO lines to see whether the molecular gas distribution, kinematics, and physical conditions at 10 - 100 pc scale follows the AGN unified model or not. In 100 pc scale, most of the circumnuclear molecular gas shows smooth velocity gradient, suggesting a regular rotating feature, and also shows abnormal line ratios, suggesting the existence of active sources to make the circumnuclear molecular…
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