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

T. Taro Shimizu, R. I. Davies, D. Lutz, L. Burtscher, M. Lin, D. Baron, R. L. Davies, R. Genzel, E. K.S. Hicks, M. Koss, W. Maciejewski, F. Müller-Sánchez, G. Orban de Xivry, S. H. Price, C. Ricci, R. Riffel, R. A. Riffel, D. Rosario, M. Schartmann, A. Schnorr-MüllerA. Sternberg, E. Sturm, T. Storchi-Bergmann, L. Tacconi, S. Veilleux

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53 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)5860-5887
Number of pages28
JournalMonthly Notices of the Royal Astronomical Society
Volume490
Issue number4
DOIs
StatePublished - 1 Dec 2019

Funding

FundersFunder number
ASIAA (Taiwan)
AUI/NRAO
NASA/IPAC
National Science Foundation
National Aeronautics and Space Administration
National Research Council Canada
National Science Council
Korea Astronomy and Space Science Institute
National Institutes of Natural Sciences
National Astronomical Observatory of Japan

    Keywords

    • Galaxies: Seyfert
    • Galaxies: active
    • Galaxies: individual: NGC 5728
    • Galaxies: nuclei

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