ALMA [CI] observations toward the central region of a Seyfert galaxy NGC 613

Abstract

We report ALMA observations of [CI](${}^3{P}_1{-}^3{P}_0$), C${}^{13}$O, and CO${}^{18}$ ($J=1-0$) toward the central region of a nearby Seyfert galaxy NGC 613. The very high resolutions of $0.26"\times 0.23"(=22\times 20$ pc) for [CI] and $0.42"\times 0.35"(=36\times 30$ pc) for C${}^{13}$O, and CO${}^{18}$ resolve the circum-nuclear disk (CND) and star-forming ring. The distribution of [CI] in the ring resembles that of the CO emission, although [CI] is prominent in the CND. This can be caused by the low intensities of the CO isotopes due to the low optical depths under the high temperature in the CND. We found that the intensity ratios of [CI] to C${}^{12}$O(3-2) ($R_{CI/CO}$) and to C${}^{13}$O(1-0) ($R_{CI/{\mathrm{C}}^{13}\mathrm{O}}$) are high at several positions around the edge of the ring. The spectral profiles of CO lines mostly correspond each other in the spots of the ring and high $R_{CI/CO}$, but those of [CI] at spots of high $R_{CI/CO}$ are different from CO. These results indicate that [CI] at the high $R_{CI/CO}$ traces different gas from that traced by the CO lines. The [CI] kinematics along the minor axis of NGC 613 could be interpreted as a bubbly molecular outflow. The outflow rate of molecular gas is higher than star formation rate in the CND. The flow could be mainly boosted by the AGN through its radio jets.

6 pages, 4 figures, 1 supplement material, Accepted for publication in PASJ Letter

References in corpus (6)

• Gas Dynamics and Outflow in the Barred Starburst Galaxy NGC 1808 Revealed with ALMA
• Dissecting Galaxies: Separating Star Formation, Shock Excitation and AGN Activity in the Central Region of NGC 613
• Distributions of molecules in the circumnuclear disk and surrounding starburst ring in the Seyfert galaxy NGC 1068 observed with ALMA
• A Multi-Transition Study of Molecules toward NGC 1068 based on High-Resolution Imaging Observations with ALMA
• ALMA multiline observations toward the central region of NGC 613
• Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations

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