RT Journal Article
T1 Kinematic analysis of the super-extended Hi disk of the nearby spiral galaxy M 83
A1 Eibensteiner, C.
A1 Bigiel, F.
A1 Leroy, A. K.
A1 Koch, E. W.
A1 Rosolowsky, E.
A1 Schinnerer, E.
A1 Sardone, A.
A1 Meidt, S.
A1 Sánchez Blázquez, Patricia
A1 Winkel, B.
AB We present new H I observations of the nearby massive spiral galaxy M 83 taken with the JVLA at 21″ angular resolution (≈500 pc) of an extended (∼1.5 deg^(2)) ten-point mosaic combined with GBT single-dish data. We study the super-extended H I disk of M 83 (∼50 kpc in radius), in particular disk kinematics, rotation, and the turbulent nature of the atomic interstellar medium. We define distinct regions in the outer disk (r_(gal) > central optical disk), including a ring, a southern area, a southern arm and a northern arm. We examine H I gas surface density, velocity dispersion, and noncircular motions in the outskirts, which we compare to the inner optical disk. We find an increase of velocity dispersion (σ_(v)) toward the pronounced H I ring, indicative of more turbulent H I gas. Additionally, we report over a large galactocentric radius range (until r_(gal) ∼ 50 kpc) where σ_(v) is slightly larger than thermal component (i.e., > 8 km s^(−1)). We find that a higher star-formation rate (as traced by far UV emission) is not necessarily always associated with a higher H I velocity dispersion, suggesting that radial transport could be a dominant driver for the enhanced velocity dispersion. Furthermore, we find a possible branch that connects the extended H I disk to the dwarf irregular galaxy UGCA 365 and that deviates from the general direction of the northern arm. Lastly, we compare mass flow rate profiles (based on 2D and 3D tilted ring models) and find evidence for outflowing gas at rgal ∼ 2 kpc, inflowing gas at r_(gal) ∼ 5.5 kpc, and outflowing gas at r_(gal) ∼ 14 kpc. We caution that mass flow rates are highly sensitive to the assumed kinematic disk parameters, in particular to inclination.
PB EDP Sciences
SN 0004-6361
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/136793
UL https://hdl.handle.net/20.500.14352/136793
LA eng
NO Eibensteiner, C., Bigiel, F., Leroy, A. K., Koch, E. W., Rosolowsky, E., Schinnerer, E., ... & Winkel, B. (2023). Kinematic analysis of the super-extended H I disk of the nearby spiral galaxy M 83. Astronomy & Astrophysics, 675, A37.
NO ©The authors 2023Artículo firmado por 36 autores
NO German Research Foundation
NO European Commission
NO National Science Foundation
NO Natural Sciences and Engineering Research Council of Canada
NO UK Research & Innovation
NO Science & Technology Facilities Council
NO Heidelberg Cluster of Excellence
NO German Excellence Strategy
NO Gobierno de España
NO Australian Research Council
NO Macquarie University
NO Australian Government
NO Canadian Space Agency
NO South African Research Chairs Initiative of the Department of Science and Technology
NO National Research Foundation
NO Green Bank Telescope (GBT)
NO National Aeronautics & Space Administration (NASA)
NO Ministry of Science & Technology (Republic of Korea)
DS Docta Complutense
RD 20 ago 2026