The SAMI Galaxy Survey: energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies

Luwenjia Zhou, Christoph Federrath, Tiantian Yuan, Fuyan Bian, Anne M. Medling, Yong Shi, Joss Bland-Hawthorn, Julia J. Bryant, Sarah Brough, Barbara Catinella, Scott M. Croom, Michael Goodwin, Gregory Goldstein, Andrew W. Green, Iraklis S. Konstantopoulos, Jon S. Lawrence, Matt S. Owers, Samuel N. Richards, Sebastian F. Sanchez

Research output: Contribution to journalArticle

Abstract

We investigate the energy sources of random turbulent motions of ionized gas from H alpha 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.

LanguageEnglish
Pages4573-4582
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number4
DOIs
StatePublished - Oct 2017

Cite this

Zhou, Luwenjia ; Federrath, Christoph ; Yuan, Tiantian ; Bian, Fuyan ; Medling, Anne M. ; Shi, Yong ; Bland-Hawthorn, Joss ; Bryant, Julia J. ; Brough, Sarah ; Catinella, Barbara ; Croom, Scott M. ; Goodwin, Michael ; Goldstein, Gregory ; Green, Andrew W. ; Konstantopoulos, Iraklis S. ; Lawrence, Jon S. ; Owers, Matt S. ; Richards, Samuel N. ; Sanchez, Sebastian F./ The SAMI Galaxy Survey : energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 470, No. 4. pp. 4573-4582
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title = "The SAMI Galaxy Survey: energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies",
abstract = "We investigate the energy sources of random turbulent motions of ionized gas from H alpha 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.",
keywords = "ISM: kinematics and dynamics, galaxies: ISM, galaxies: star formation, MASS ASSEMBLY GAMA, MOLECULAR INTERSTELLAR-MEDIUM, SIMILAR-TO 2, DISK GALAXIES, STELLAR MASS, GAS KINEMATICS, SINS SURVEY, CLASSIFICATION, EVOLUTION, SPECTROSCOPY",
author = "Luwenjia Zhou and Christoph Federrath and Tiantian Yuan and Fuyan Bian and Medling, {Anne M.} and Yong Shi and Joss Bland-Hawthorn and Bryant, {Julia J.} and Sarah Brough and Barbara Catinella and Croom, {Scott M.} and Michael Goodwin and Gregory Goldstein and Green, {Andrew W.} and Konstantopoulos, {Iraklis S.} and Lawrence, {Jon S.} and Owers, {Matt S.} and Richards, {Samuel N.} and Sanchez, {Sebastian F.}",
year = "2017",
month = "10",
doi = "10.1093/mnras/stx1504",
language = "English",
volume = "470",
pages = "4573--4582",
journal = "Monthly Notices of the Royal Astronomical Society",
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Zhou, L, Federrath, C, Yuan, T, Bian, F, Medling, AM, Shi, Y, Bland-Hawthorn, J, Bryant, JJ, Brough, S, Catinella, B, Croom, SM, Goodwin, M, Goldstein, G, Green, AW, Konstantopoulos, IS, Lawrence, JS, Owers, MS, Richards, SN & Sanchez, SF 2017, 'The SAMI Galaxy Survey: energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies' Monthly Notices of the Royal Astronomical Society, vol 470, no. 4, pp. 4573-4582. DOI: 10.1093/mnras/stx1504

The SAMI Galaxy Survey : energy sources of the turbulent velocity dispersion in spatially resolved local star-forming galaxies. / Zhou, Luwenjia; Federrath, Christoph; Yuan, Tiantian; Bian, Fuyan; Medling, Anne M.; Shi, Yong; Bland-Hawthorn, Joss; Bryant, Julia J.; Brough, Sarah; Catinella, Barbara; Croom, Scott M.; Goodwin, Michael; Goldstein, Gregory; Green, Andrew W.; Konstantopoulos, Iraklis S.; Lawrence, Jon S.; Owers, Matt S.; Richards, Samuel N.; Sanchez, Sebastian F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 470, No. 4, 10.2017, p. 4573-4582.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The SAMI Galaxy Survey

T2 - Monthly Notices of the Royal Astronomical Society

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 alpha 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 alpha 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

KW - MASS ASSEMBLY GAMA

KW - MOLECULAR INTERSTELLAR-MEDIUM

KW - SIMILAR-TO 2

KW - DISK GALAXIES

KW - STELLAR MASS

KW - GAS KINEMATICS

KW - SINS SURVEY

KW - CLASSIFICATION

KW - EVOLUTION

KW - SPECTROSCOPY

U2 - 10.1093/mnras/stx1504

DO - 10.1093/mnras/stx1504

M3 - Article

VL - 470

SP - 4573

EP - 4582

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -