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

被引：41

作者：

Zhou, Luwenjia ^{[1
,2
,3
]}

Federrath, Christoph ^{[2
]}

Yuan, Tiantian ^{[2
]}

Bian, Fuyan ^{[2
]}

Medling, Anne M. ^{[2
,4
]}

Shi, Yong ^{[1
,3
]}

Bland-Hawthorn, Joss ^{[5
]}

Bryant, Julia J. ^{[5
,6
,7
]}

Brough, Sarah ^{[8
]}

Catinella, Barbara ^{[9
]}

Croom, Scott M. ^{[5
,7
]}

Goodwin, Michael ^{[6
]}

Goldstein, Gregory ^{[10
]}

Green, Andrew W. ^{[6
]}

Konstantopoulos, Iraklis S. ^{[6
,11
]}

Lawrence, Jon S. ^{[6
]}

Owers, Matt S. ^{[6
,10
]}

Richards, Samuel N. ^{[5
,7
,12
]}

Sanchez, Sebastian F. ^{[13
]}

机构：

[1] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China

[2] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[3] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China

[4] CALTECH, Cahill Ctr Astron & Astrophys, MS 249-17, Pasadena, CA 91125 USA

[5] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[6] Australian Astron Observ, POB 915, N Ryde, NSW 1670, Australia

[7] ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW, Australia

[8] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[9] Univ Western Australia, ICRAR, M468,35 Stirling Highway, Crawley, WA 6009, Australia

[10] Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia

[11] Atlassian, 341 George St Sydney, Sydney, NSW 2000, Australia

[12] Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia

[13] Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 470卷 / 04期

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

ISM: kinematics and dynamics; galaxies: ISM; galaxies: star formation; MASS ASSEMBLY GAMA; MOLECULAR INTERSTELLAR-MEDIUM; SIMILAR-TO; DISK GALAXIES; STELLAR MASS; GAS KINEMATICS; SINS SURVEY; CLASSIFICATION; EVOLUTION; SPECTROSCOPY;

D O I：

10.1093/mnras/stx1504

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：4573 / 4582

页数：10

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