The SAMI survey: evidence for dynamical coupling of ionized gas and young stellar populations

Author:

Foster Caroline123ORCID,Vaughan Sam3456ORCID,Fraser-McKelvie Amelia37ORCID,Brough Sarah13ORCID,Bryant Julia J238,Croom Scott M23ORCID,D’Eugenio Francesco910ORCID,Groves Brent7ORCID,Konstantopoulos Iraklis S11,López-Sánchez Ángel R345ORCID,Oh Sree31213ORCID,Owers Matt S345ORCID,Sweet Sarah M314ORCID,van de Sande Jesse23ORCID,Wisnioski Emily312ORCID,Yi Sukyoung K13,Zovaro Henry R M312ORCID

Affiliation:

1. School of Physics, University of New South Wales , Sydney, New South Wales 2052, Australia

2. Sydney Institute for Astronomy, School of Physics , A28, The University of Sydney, New South Wales 2006, Australia

3. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D)

4. Astronomy, Astrophysics and Astrophotonics Research Centre, Macquarie University , Sydney, New South Wales 2109, Australia

5. School of Mathematical and Physical Sciences, Macquarie University , New South Wales 2109, Australia

6. Centre for Astrophysics and Supercomputing, School of Science, Swinburne University of Technology , Hawthorn, Victoria 3122, Australia

7. International Centre for Radio Astronomy Research, The University of Western Australia , 35 Stirling Hwy, Crawley 6009, Western Australia

8. Astralis-USydney, School of Physics, University of Sydney , New South Wales 2006, Australia

9. Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA, United Kingdom

10. Cavendish Laboratory - Astrophysics Group, University of Cambridge , 19 JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom

11. Independent Scholar, Wellington , Wellington 6011, New Zealand

12. Research School of Astronomy and Astrophysics, Australian National University , Cotter Road, Weston Creek, Australian Capital Territory 2611, Australia

13. Department of Astronomy and Yonsei University Observatory, Yonsei University , Seoul 03722, Republic of Korea

14. School of Mathematics and Physics, University of Queensland , Brisbane, Queensland 4072, Australia

Abstract

ABSTRACT We explore local and global dynamical differences between the kinematics of ionized gas and stars in a sample of galaxies from Data Release 3 of the SAMI Galaxy Survey. We find better agreement between local (i.e. comparing on a spaxel-to-spaxel basis) velocities and dispersion of gas and stars in younger systems as with previous work on the asymmetric drift in galaxies, suggesting that the dynamics of stars and ionized gas are initially coupled. The intrinsic scatter around the velocity and dispersion relations increases with increasing stellar age and mass, suggesting that subsequent mechanisms, such as internal processes, divergent star formation, and assembly histories, also play a role in setting and altering the dynamics of galaxies. The global (flux-weighted) dynamical support of older galaxies is hotter than in younger systems. We find that the ionized gas in galaxies is almost always dynamically colder than the stars with a steeper velocity gradient. In absolute terms, the local difference in velocity dispersion is more pronounced than the local difference in velocity, possibly reflecting inherent differences in the impact of turbulence, inflow and/or feedback on gas compared to stars. We suggest how these findings may be taken into account when comparing high and low redshift galaxy samples to infer dynamical evolution.

Funder

Australian Research Council

Korean National Research Foundation

ERC

Science and Technology Facilities Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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