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

Zhou, Luwenjia and Federrath, Christoph and Yuan, Tiantian and Bian, Fuyan and Medling, Anne M. and Shi, Yong and Bland-Hawthorn, Joss and Bryant, Julia J. and Brough, Sarah and Catinella, Barbara and Croom, Scott M. and Goodwin, Michael and Goldstein, Gregory and Green, Andrew W. and Konstantopoulos, Iraklis S. and Lawrence, Jon S. and Owers, Matt S. and Richards, Samuel N. and Sanchez, Sebastian F. (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, 470 (4). pp. 4573-4582. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20170914-132934739

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stx1504DOIArticle
https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1504PublisherArticle
https://arxiv.org/abs/1706.04754arXivDiscussion Paper
ORCID:
AuthorORCID
Medling, Anne M.0000-0001-7421-2944
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Received: 18 March 2017. Revision Received: 13 June 2017. Accepted: 14 June 2017. Published: 20 June 2017. LZ and YS acknowledge support for this work from the National Natural Science Foundation of China (NSFC grant 11373021) and the Excellent Youth Foundation of the Jiangsu Scientific Committee (grant BK20150014). CF gratefully acknowledges funding provided by the Australian Research Council’s Discovery Projects (grants DP150104329 and DP170100603). Support for AMM is provided by NASA through Hubble Fellowship grant no. HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. for NASA, under contract NAS5-26555. We thank R. Genzel, N. Förster Schreiber, M.D. Lehnert and N.P.H. Nesvadba for their support on providing high-z measurements displayed in this work. We thank the anonymous referee for his/her thorough review and highly appreciate the comments and suggestions, which significantly contributed to improving the quality of the publication. MSO acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140100255). BC acknowledges support from the Australian Research Council’s Future Fellowship (FT120100660) funding scheme. SB acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140101166). SFS thanks PAPIIT-DGAPA-IA101217 project and CONACYT-IA-180125. We would like to thank the anonymous reviewer for his/her helpful and constructive comments that greatly contributed to improving the final version of the paper. The SAMI Galaxy Survey is based on observations made at the Anglo–Australian Telescope. The Sydney-AAO Multi-object Integral field spectrograph (SAMI) was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI input catalogue is based on data taken from the Sloan Digital Sky Survey, the GAMA Survey and the VST ATLAS Survey. The SAMI Galaxy Survey is funded by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020, and other participating institutions. The SAMI Galaxy Survey website is http://sami-survey.org/.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China11373021
Jiangsu Scientific Committee Excellent Youth Foundation BK20150014
Australian Research CouncilDP150104329
Australian Research CouncilDP170100603
NASA Hubble FellowshipHST-HF2-51377
NASANAS5-26555
Australian Research CouncilFT140100255
Australian Research CouncilFT120100660
Australian Research CouncilFT140101166
Australian Research CouncilCE110001020
Subject Keywords:ISM: kinematics and dynamics, galaxies: ISM, galaxies: star formation
Record Number:CaltechAUTHORS:20170914-132934739
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170914-132934739
Official Citation: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; 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, Volume 470, Issue 4, 1 October 2017, Pages 4573–4582, https://doi.org/10.1093/mnras/stx1504
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81446
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Sep 2017 22:00
Last Modified:14 Sep 2017 22:00

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