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The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728

Shimizu, TT, Davies, RI, Lutz, D, Burtscher, L, Lin, M, Baron, D, Davies, RL, Genzel, R, Hicks, EKS, Koss, M, Maciejewski, W, Muller-Sanchez, F, de Xivry, GO, Price, SH, Ricci, C, Riffel, R, Riffel, RA, Rosario, D, Schartmann, M, Schnorr-Mueller, A , Sternberg, A, Sturm, E, Storchi-Bergmann, T, Tacconi, L and Veilleux, S (2019) The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728. Monthly Notices of the Royal Astronomical Society, 490 (4). pp. 5860-5887. ISSN 0035-8711

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We report on our combined analysis of HST, VLT/MUSE, VLT/SINFONI, and ALMA observations of the local Seyfert 2 galaxy, NGC 5728 to investigate in detail the feeding and feedback of the active galactic nucleus (AGN). The data sets simultaneously probe the morphology, excitation, and kinematics of the stars, ionized gas, and molecular gas over a large range of spatial scales (10 pc to 10 kpc). NGC 5728 contains a large stellar bar that is driving gas along prominent dust lanes to the inner 1 kpc where the gas settles into a circumnuclear ring. The ring is strongly star forming and contains a substantial population of young stars as indicated by the lowered stellar velocity dispersion and gas excitation consistent with H II regions. We model the kinematics of the ring using the velocity field of the CO (2–1) emission and stars and find it is consistent with a rotating disc. The outer regions of the disc, where the dust lanes meet the ring, show signatures of inflow at a rate of 1 M⊙ yr−1. Inside the ring, we observe three molecular gas components corresponding to the circular rotation of the outer ring, a warped disc, and the nuclear stellar bar. The AGN is driving an ionized gas outflow that reaches a radius of 250 pc with a mass outflow rate of 0.08 M⊙ yr−1 consistent with its luminosity and scaling relations from previous studies. While we observe distinct holes in CO emission which could be signs of molecular gas removal, we find that largely the AGN is not disrupting the structure of the circumnuclear region.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 05 Feb 2020 11:28
Last Modified: 04 Sep 2021 07:58
DOI or ID number: 10.1093/mnras/stz2802
URI: https://researchonline.ljmu.ac.uk/id/eprint/12190
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