What drives the velocity dispersion of ionized gas in star-forming galaxies?

Journal Article · 25 April 2019 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stz1146 · OSTI ID:1511104

Yu, Xiaoling  ^[1]; Shi, Yong  ^[1]; Chen, Yanmei ^[1]; Law, David R. ^[2]; Bizyaev, Dmitry ^[3]; Bing, Longji  ^[1]; Li, Songlin  ^[1]; Zhou, Luwenjia ^[1]; Chen, Jianhang ^[1]; Riffel, Rogemar A.  ^[4]; Riffel, Rogério  ^[5]; Zhang, Kai ^[6]; Chen, Yongyun ^[1]; Pan, Kaike ^[7]

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1. School of Astronomy and Space Science, Nanjing University, Nanjing 210093, China, Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, China
2. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
3. Apache Point Observatory and New Mexico State University, PO Box 59, Sunspot, NM 88349-0059, USA, Sternberg Astronomical Institute, Moscow State University, Moscow 119234, Russia
4. Departamento de Física, CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil, Laboratório Interinstitucional de e-Astronomia, Rua General José Cristino, 77 Vasco da Gama, Rio de Janeiro 20921-400, Brazil
5. Laboratório Interinstitucional de e-Astronomia, Rua General José Cristino, 77 Vasco da Gama, Rio de Janeiro 20921-400, Brazil, Departamento de Astronomia, Universidade Federal do Rio Grandedo Sul - Av. Bento Gonçalves 9500, Porto Alegre, RS, Brazil
6. Department of Physics and Astronomy, University of Kentucky, 505 Rose Street, Lexington, KY 40506, USA
7. Apache Point Observatory and New Mexico State University, PO Box 59, Sunspot, NM 88349-0059, USA

Abstract We analyse the intrinsic velocity dispersion properties of 648 star-forming galaxies observed by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, to explore the relation of intrinsic gas velocity dispersions with star formation rates (SFRs), SFR surface densities ($$\rm {\Sigma _{SFR}}$$), stellar masses, and stellar mass surface densities ($$\rm {\Sigma _{*}}$$). By combining with high z galaxies, we found that there is a good correlation between the velocity dispersion and the SFR as well as $$\rm {\Sigma _{SFR}}$$. But the correlation between the velocity dispersion and the stellar mass as well as $$\rm {\Sigma _{*}}$$ is moderate. By comparing our results with predictions of theoretical models, we found that the energy feedback from star formation processes alone and the gravitational instability alone cannot fully explain simultaneously the observed velocity–dispersion/SFR and velocity–dispersion/$$\rm {\Sigma _{SFR}}$$ relationships.

• Sponsoring Organization: USDOE
• OSTI ID: 1511104
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 486; ISSN 0035-8711
• Publisher: Oxford University PressCopyright Statement
• Country of Publication: United Kingdom
• Language: English