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The SAMI Galaxy Survey: Gas velocity dispersions in low-$z$ star-forming galaxies and the drivers of turbulence | Mathew R. Varidel
; Scott M. Croom
; Geraint F. Lewis
; Deanne B. Fisher
; Karl Glazebrook
; Barbara Catinella
; Luca Cortese
; Mark R. Krumholz
; Joss Bland-Hawthorn
; Julia J. Bryant
; Brent Groves
; Sarah Brough
; Christoph Federrath
; Jon S. Lawrence
; Nuria P. Lorente
; Matt S. Owers
; Samuel N. Richards
; Ángel R. López-Sánchez
; Sarah M. Sweet
; Jesse van de Sande
; Sam P. Vaughan
; | Date: |
11 May 2020 | Abstract: | We infer the intrinsic ionised gas kinematics for 383 star-forming galaxies
across a range of integrated star-formation rates (SFR $in [10^{-3}, 10^2]$
M$_odot$ yr$^{-1}$) at $z lesssim 0.1$ using a consistent 3D
forward-modelling technique. The total sample is a combination of galaxies from
the SAMI Galaxy Survey and DYNAMO survey. For typical low-$z$ galaxies taken
from the SAMI Galaxy Survey, we find the vertical velocity dispersion
($sigma_{v, z}$) to be positively correlated with measures of star-formation
rate, stellar mass, HI gas mass, and rotational velocity. The greatest
correlation is with star-formation rate surface density ($Sigma_ ext{SFR}$).
Using the total sample, we find $sigma_{v, z}$ increases slowly as a function
of integrated star-formation rate in the range SFR $in$ [$10^{-3}$, 1]
M$_odot$ yr$^{-1}$ from $17pm3$ km s$^{-1}$ to $24pm5$ km s$^{-1}$ followed
by a steeper increase up to $sigma_{v, z}$ $sim 80$ km s$^{-1}$ for SFR
$gtrsim 1$ M$_odot$ yr$^{-1}$. This is consistent with recent theoretical
models that suggest a $sigma_{v, z}$ floor driven by star-formation feedback
processes with an upturn in $sigma_{v, z}$ at higher SFR driven by
gravitational transport of gas through the disc. | Source: | arXiv, 2005.4874 | Services: | Forum | Review | PDF | Favorites |
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