The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment

Author:

Croom Scott M12ORCID,van de Sande Jesse12ORCID,Vaughan Sam P1234ORCID,Rutherford Tomas H12ORCID,Lagos Claudia del P25ORCID,Barsanti Stefania26ORCID,Bland-Hawthorn Joss12ORCID,Brough Sarah27ORCID,Bryant Julia J128ORCID,Colless Matthew26ORCID,Cortese Luca25ORCID,D’Eugenio Francesco910ORCID,Fraser-McKelvie Amelia2511ORCID,Goodwin Michael12ORCID,Lorente Nuria P F12ORCID,Richards Samuel N1ORCID,Ristea Andrei25ORCID,Sweet Sarah M213ORCID,Yi Sukyoung K14ORCID,Zafar Tayyaba2315ORCID

Affiliation:

1. Sydney Institute for Astronomy, School of Physics, University of Sydney , NSW 2006 , Australia

2. ASTRO3D: ARC Centre of Excellence for All-sky Astrophysics in 3D

3. Astronomy, Astrophysics and Astrophotonics Research Centre, Macquarie University , Sydney, NSW 2109 , Australia

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

5. International Centre for Radio Astronomy Research, The University of Western Australia , 35 Stirling Highway, Crawley WA 6009 , Australia

6. Research School of Astronomy and Astrophysics, The Australian National University , Canberra, ACT 2611 , Australia

7. School of Physics, University of New South Wales , NSW 2052 , Australia

8. Astralis-USydney, School of Physics, University of Sydney , NSW 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 Tohmson Avenue, Cambridge, CB3 0HE , United Kingdom

11. European Southern Observatory , Karl-Schwarzschild-Strasse 2, D-85748, Garching , Germany

12. AAO-MQ, Faculty of Science & Engineering, Macquarie University , 105 Delhi Rd, North Ryde, NSW 2113 , Australia

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

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

15. School of Mathematical and Physical Sciences, Macquarie University , NSW 2109 , Australia

Abstract

ABSTRACT We use the SAMI Galaxy Survey to examine the drivers of galaxy spin, $\lambda _{R_{\rm e}}$, in a multidimensional parameter space including stellar mass, stellar population age (or specific star formation rate), and various environmental metrics (local density, halo mass, satellite versus central). Using a partial correlation analysis, we consistently find that age or specific star formation rate is the primary parameter correlating with spin. Light-weighted age and specific star formation rate are more strongly correlated with spin than mass-weighted age. In fact, across our sample, once the relation between light-weighted age and spin is accounted for, there is no significant residual correlation between spin and mass, or spin and environment. This result is strongly suggestive that the present-day environment only indirectly influences spin, via the removal of gas and star formation quenching. That is, environment affects age, then age affects spin. Older galaxies then have lower spin, either due to stars being born dynamically hotter at high redshift, or due to secular heating. Our results appear to rule out environmentally dependent dynamical heating (e.g. galaxy–galaxy interactions) being important, at least within 1 Re where our kinematic measurements are made. The picture is more complex when we only consider high-mass galaxies (M* ≳ 1011 M⊙). While the age-spin relation is still strong for these high-mass galaxies, there is a residual environmental trend with central galaxies preferentially having lower spin, compared to satellites of the same age and mass. We argue that this trend is likely due to central galaxies being a preferred location for mergers.

Funder

STFC

Australian Research Council

AAO

Australian Government

National Research Foundation of Korea

SIRF

Science and Technology Facilities Council

ERC

Publisher

Oxford University Press (OUP)

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