TY - JOUR
T1 - The SAMI galaxy survey
T2 - gas velocity dispersions in low-z star-forming galaxies and the drivers of turbulence
AU - Varidel, Mathew R.
AU - Croom, Scott M.
AU - Lewis, Geraint F.
AU - Fisher, Deanne B.
AU - Glazebrook, Karl
AU - Catinella, Barbara
AU - Cortese, Luca
AU - Krumholz, Mark R.
AU - Bland-Hawthorn, Joss
AU - Bryant, Julia J.
AU - Groves, Brent
AU - Brough, Sarah
AU - Federrath, Christoph
AU - Lawrence, Jon S.
AU - Lorente, Nuria P.
AU - Owers, Matt S.
AU - Richards, Samuel N.
AU - López-Sánchez, Ángel R.
AU - Sweet, Sarah M.
AU - van de Sande, Jesse
AU - Vaughan, Sam P.
N1 - Publisher Copyright:
© 2020 The Author(s)
PY - 2020
Y1 - 2020
N2 - We infer the intrinsic ionized gas kinematics for 383 star-forming galaxies across a range of integrated star formation rates (SFR ∈ [10−3, 102] M yr−1) at z 0.1 using a consistent 3D forward-modelling technique. The total sample is a combination of galaxies from the Sydney-AAO Multiobject Integral field Spectrograph (SAMI) Galaxy survey and DYnamics of Newly Assembled Massive Objects survey. For typical low-z galaxies taken from the SAMI Galaxy Survey, we find the vertical velocity dispersion (σv,z) to be positively correlated with measures of SFR, stellar mass, H I gas mass, and rotational velocity. The greatest correlation is with SFR surface density (SFR). Using the total sample, we find σv,z increases slowly as a function of integrated SFR in the range SFR ∈ [10−3, 1] M yr−1 from 17 ± 3 to 24 ± 5 km s−1 followed by a steeper increase up to σv,z -80 km s−1 for SFR 1 M yr−1. This is consistent with recent theoretical models that suggest a σv,z floor driven by star formation feedback processes with an upturn in σv,z at higher SFR driven by gravitational transport of gas through the disc.
AB - We infer the intrinsic ionized gas kinematics for 383 star-forming galaxies across a range of integrated star formation rates (SFR ∈ [10−3, 102] M yr−1) at z 0.1 using a consistent 3D forward-modelling technique. The total sample is a combination of galaxies from the Sydney-AAO Multiobject Integral field Spectrograph (SAMI) Galaxy survey and DYnamics of Newly Assembled Massive Objects survey. For typical low-z galaxies taken from the SAMI Galaxy Survey, we find the vertical velocity dispersion (σv,z) to be positively correlated with measures of SFR, stellar mass, H I gas mass, and rotational velocity. The greatest correlation is with SFR surface density (SFR). Using the total sample, we find σv,z increases slowly as a function of integrated SFR in the range SFR ∈ [10−3, 1] M yr−1 from 17 ± 3 to 24 ± 5 km s−1 followed by a steeper increase up to σv,z -80 km s−1 for SFR 1 M yr−1. This is consistent with recent theoretical models that suggest a σv,z floor driven by star formation feedback processes with an upturn in σv,z at higher SFR driven by gravitational transport of gas through the disc.
KW - Galaxies: disc
KW - Methods: data analysis
KW - Methods: statistical
KW - Techniques: imaging spectroscopy
UR - https://www.scopus.com/pages/publications/85091878320
U2 - 10.1093/MNRAS/STAA1272
DO - 10.1093/MNRAS/STAA1272
M3 - Article
SN - 0035-8711
VL - 495
SP - 2265
EP - 2284
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -