GOALS-JWST: Resolving the Circumnuclear Gas Dynamics in NGC 7469 in the Mid-infrared

November 2022 • 2022ApJ...940L...5U

Authors • U, Vivian • Lai, Thomas • Bianchin, Marina • Remigio, Raymond P. • Armus, Lee • Larson, Kirsten L. • Díaz-Santos, Tanio • Evans, Aaron • Stierwalt, Sabrina • Law, David R. • Malkan, Matthew A. • Linden, Sean • Song, Yiqing • van der Werf, Paul P. • Gao, Tianmu • Privon, George C. • Medling, Anne M. • Barcos-Muñoz, Loreto • Hayward, Christopher C. • Inami, Hanae • Rich, Jeff • Aalto, Susanne • Appleton, Philip • Bohn, Thomas • Böker, Torsten • Brown, Michael J. I. • Charmandaris, Vassilis • Finnerty, Luke • Howell, Justin • Iwasawa, Kazushi • Kemper, Francisca • Marshall, Jason • Mazzarella, Joseph M. • McKinney, Jed • Muller-Sanchez, Francisco • Murphy, Eric J. • Sanders, David • Surace, Jason

Abstract • The nearby, luminous infrared galaxy NGC 7469 hosts a Seyfert nucleus with a circumnuclear star-forming ring and is thus the ideal local laboratory for investigating the starburst-AGN (active galactic nucleus) connection in detail. We present integral-field observations of the central 1.3 kpc region in NGC 7469 obtained with the JWST Mid-InfraRed Instrument. Molecular and ionized gas distributions and kinematics at a resolution of ~100 pc over the 4.9-7.6 μm region are examined to study the gas dynamics influenced by the central AGN. The low-ionization [Fe II] λ5.34 μm and [Ar II] λ6.99 μm lines are bright on the nucleus and in the starburst ring, as opposed to H₂ S(5) λ6.91 μm, which is strongly peaked at the center and surrounding ISM. The high-ionization [Mg V] line is resolved and shows a broad, blueshifted component associated with the outflow. It has a nearly face-on geometry that is strongly peaked on the nucleus, where it reaches a maximum velocity of -650 km s^-1, and extends about 400 pc to the east. Regions of enhanced velocity dispersion in H₂ and [Fe II] ~ 180 pc from the AGN that also show high L(H₂)/L(PAH) and L([Fe II])/L(Pfα) ratios to the W and N of the nucleus pinpoint regions where the ionized outflow is depositing energy, via shocks, into the dense interstellar medium between the nucleus and the starburst ring. These resolved mid-infrared observations of the nuclear gas dynamics demonstrate the power of JWST and its high-sensitivity integral-field spectroscopic capability to resolve feedback processes around supermassive black holes in the dusty cores of nearby luminous infrared galaxies.

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