TY - JOUR
T1 - Kinematic analysis of the super-extended HI disk of the nearby spiral galaxy M 83
AU - Eibensteiner, Cosima
AU - Bigiel, Frank
AU - Leroy, Adam K.
AU - Koch, Eric W.
AU - Rosolowsky, Erik
AU - Schinnerer, Eva
AU - Sardone, Amy
AU - Meidt, Sharon
AU - Blok, W. J. G de
AU - Thilker, David
AU - Pisano, D. J.
AU - Ott, Jürgen
AU - Barnes, Ashley
AU - Querejeta, Miguel
AU - Emsellem, Eric
AU - Puschnig, Johannes
AU - Utomo, Dyas
AU - Bešlic, Ivana
AU - Brok, Jakob den
AU - Faridani, Shahram
AU - Glover, Simon C. O.
AU - Grasha, Kathryn
AU - Hassani, Hamid
AU - Henshaw, Jonathan D.
AU - Jiménez-Donaire, Maria J.
AU - Kerp, Jürgen
AU - Dale, Daniel A.
AU - Kruijssen, J. M. Diederik
AU - Laudage, Sebastian
AU - Sanchez-Blazquez, Patricia
AU - Smith, Rowan
AU - Stuber, Sophia
AU - Pessa, Ismael
AU - Watkins, Elizabeth J.
AU - Williams, Thomas G.
AU - Winkel, Benjamin
N1 - Funding: CE, FB, AB, IB, JdB and JP acknowledge funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No.726384/Empire).
TGW acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 694343). JMDK gratefully acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme via the ERC Starting Grant MUSTANG (grant agreement number 714907).
SCOG acknowledges funding from the European Research Council via the ERC Synergy Grant “ECOGAL – Understanding our Galactic ecosystem: From the disk of the Milky Way to the formation sites of stars and planets” (project ID 855130).
WJGdB received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 882793 ‘MeerGas’).
PY - 2023/7
Y1 - 2023/7
N2 - We present new HI observations of the nearby massive spiral galaxy M83, taken with the VLA at 21″ angular resolution (≈500 pc) of an extended (1.5 deg2) 10-point mosaic combined with GBT single dish data. We study the super-extended HI disk of M83 (∼50 kpc in radius), in particular disc kinematics, rotation and the turbulent nature of the atomic interstellar medium. We define distinct regions in the outer disk (rgal > central optical disk), including ring, southern area, and southern and northern arm. We examine HI gas surface density, velocity dispersion and non-circular motions in the outskirts, which we compare to the inner optical disk. We find an increase of velocity dispersion (σv) towards the pronounced HI ring, indicative of more turbulent HI gas. Additionally, we report over a large galactocentric radius range (until rgal ∼ 50 kpc) that σv is slightly larger than thermal (i.e. > 8 km s-1). We find that a higher star formation rate (as traced by FUV emission) is not always necessarily associated with a higher HI velocity dispersion, suggesting that radial transport could be a dominant driver for the enhanced velocity dispersion. We further find a possible branch that connects the extended HI disk to the dwarf irregular galaxy UGCA365, 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 rgal ~ 5.5 kpc and outflowing gas at rgal ~ 14 kpc. We caution that mass flow rates are highly sensitive to the assumed kinematic disk parameters, in particular, to the inclination.
AB - We present new HI observations of the nearby massive spiral galaxy M83, taken with the VLA at 21″ angular resolution (≈500 pc) of an extended (1.5 deg2) 10-point mosaic combined with GBT single dish data. We study the super-extended HI disk of M83 (∼50 kpc in radius), in particular disc kinematics, rotation and the turbulent nature of the atomic interstellar medium. We define distinct regions in the outer disk (rgal > central optical disk), including ring, southern area, and southern and northern arm. We examine HI gas surface density, velocity dispersion and non-circular motions in the outskirts, which we compare to the inner optical disk. We find an increase of velocity dispersion (σv) towards the pronounced HI ring, indicative of more turbulent HI gas. Additionally, we report over a large galactocentric radius range (until rgal ∼ 50 kpc) that σv is slightly larger than thermal (i.e. > 8 km s-1). We find that a higher star formation rate (as traced by FUV emission) is not always necessarily associated with a higher HI velocity dispersion, suggesting that radial transport could be a dominant driver for the enhanced velocity dispersion. We further find a possible branch that connects the extended HI disk to the dwarf irregular galaxy UGCA365, 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 rgal ~ 5.5 kpc and outflowing gas at rgal ~ 14 kpc. We caution that mass flow rates are highly sensitive to the assumed kinematic disk parameters, in particular, to the inclination.
KW - ISM: kinematics and dynamics
KW - Radio lines: galaxies
KW - Galaxies: groups: individual: M 83
U2 - 10.1051/0004-6361/202245290
DO - 10.1051/0004-6361/202245290
M3 - Article
SN - 0004-6361
VL - 675
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A37
ER -