TY - JOUR
T1 - The SAMI Galaxy Survey
T2 - energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies
AU - Zhou, Luwenjia
AU - Federrath, Christoph
AU - Yuan, Tiantian
AU - Bian, Fuyan
AU - Medling, Anne M.
AU - Shi, Yong
AU - Bland-Hawthorn, Joss
AU - Bryant, Julia J.
AU - Brough, Sarah
AU - Catinella, Barbara
AU - Croom, Scott M.
AU - Goodwin, Michael
AU - Goldstein, Gregory
AU - Green, Andrew W.
AU - Konstantopoulos, Iraklis S.
AU - Lawrence, Jon S.
AU - Owers, Matt S.
AU - Richards, Samuel N.
AU - Sanchez, Sebastian F.
PY - 2017/10
Y1 - 2017/10
N2 - We investigate the energy sources of random turbulent motions of ionized gas from H α emission in eight local star-forming galaxies from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. These galaxies satisfy strict pure star-forming selection criteria to avoid contamination from active galactic nuclei (AGNs) or strong shocks/outflows. Using the relatively high spatial and spectral resolution of SAMI, we find that – on sub-kpc scales, our galaxies display a flat distribution of ionized gas velocity dispersion as a function of star formation rate (SFR) surface density. A major fraction of our SAMI galaxies shows higher velocity dispersion than predictions by feedback-driven models, especially at the low SFR surface density end. Our results suggest that additional sources beyond star formation feedback contribute to driving random motions of the interstellar medium in star-forming galaxies. We speculate that gravity, galactic shear and/or magnetorotational instability may be additional driving sources of turbulence in these galaxies.
AB - We investigate the energy sources of random turbulent motions of ionized gas from H α emission in eight local star-forming galaxies from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. These galaxies satisfy strict pure star-forming selection criteria to avoid contamination from active galactic nuclei (AGNs) or strong shocks/outflows. Using the relatively high spatial and spectral resolution of SAMI, we find that – on sub-kpc scales, our galaxies display a flat distribution of ionized gas velocity dispersion as a function of star formation rate (SFR) surface density. A major fraction of our SAMI galaxies shows higher velocity dispersion than predictions by feedback-driven models, especially at the low SFR surface density end. Our results suggest that additional sources beyond star formation feedback contribute to driving random motions of the interstellar medium in star-forming galaxies. We speculate that gravity, galactic shear and/or magnetorotational instability may be additional driving sources of turbulence in these galaxies.
KW - ISM: kinematics and dynamics
KW - galaxies: ISM
KW - galaxies: star formation
UR - http://www.scopus.com/inward/record.url?scp=85034418860&partnerID=8YFLogxK
U2 - 10.1093/mnras/stx1504
DO - 10.1093/mnras/stx1504
M3 - Article
SN - 0035-8711
VL - 470
SP - 4573
EP - 4582
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -