The SAMI Galaxy Survey: ΣSFR drives the presence of complex emission-line profiles in star-forming galaxies

Author:

Zovaro Henry R M12ORCID,Mendel J Trevor12,Groves Brent23ORCID,Kewley Lisa J24,Colless Matthew12ORCID,Ristea Andrei23ORCID,Cortese Luca23ORCID,Oh Sree125ORCID,D’Eugenio Francesco267ORCID,Croom Scott M28ORCID,López-Sánchez Ángel R2910ORCID,van de Sande Jesse28ORCID,Brough Sarah211ORCID,Medling Anne M121213,Bland-Hawthorn Joss28,Bryant Julia J2814

Affiliation:

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

2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Canberra, ACT 2611 , Australia

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

4. Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge MA 02138 , USA

5. Department of Astronomy, Yonsei University , Seoul 03722 , Republic of Korea

6. Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA , UK

7. Cavendish Laboratory – Astrophysics Group, University of Cambridge , 19 JJ Thomson Avenue, Cambridge CB3 0HE , UK

8. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney , Sydney, NSW 2006 , Australia

9. Australian Astronomical Optics, Macquarie University , 105 Delhi Rd, North Ryde, NSW 2113 , Australia

10. Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics , Sydney, NSW 2109 , Australia

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

12. Ritter Astrophysical Research Center, University of Toledo , Toledo, OH 43606 , USA

13. Cahill Center for Astronomy & Astrophysics, California Institute of Technology , 1200 E. California Blvd., Pasadena, CA 91125 , USA

14. Australian Astronomical Optics, Astralis-USydney, School of Physics, University of Sydney , Sydney, NSW 2006 , Australia

Abstract

ABSTRACT Galactic fountains driven by star formation result in a variety of kinematic structures such as ionized winds and thick gas discs, both of which manifest as complex emission-line profiles that can be parametrized by multiple Gaussian components. We use integral field spectroscopy from the SAMI Galaxy Survey to spectrally resolve these features, traced by broad ${\rm H}\alpha$ components, and distinguish them from the star-forming (SF) thin disc, traced by narrow components, in 3068 galaxies in the local Universe. Using a matched sample analysis technique, we demonstrate that the presence of complex emission-line profiles in SF galaxies is most strongly correlated with the global star formation rate (SFR) surface density of the host galaxy measured within 1Re ($\Sigma _{{\rm SFR},\, R_{\rm e}}$), even when controlling for both observational biases, including inclination, amplitude-to-noise and angular scale, and sample biases in parameters such as stellar mass and SFR. Leveraging the spatially resolved nature of the data set, we determine that the presence of complex emission-line profiles within individual spaxels is driven not only by the local ΣSFR, but by the $\Sigma _{{\rm SFR},\, R_{\rm e}}$ of the host galaxy. We also parametrize the clumpiness of the SFR within individual galaxies, and find that $\Sigma _{{\rm SFR},\, R_{\rm e}}$ is a stronger predictor of the presence of complex emission-line profiles than clumpiness. We conclude that, with a careful treatment of observational effects, it is possible to identify structures traced by complex emission-line profiles, including winds and thick ionized gas discs, at the spatial and spectral resolution of SAMI using the Gaussian decomposition technique.

Funder

Australian Research Council

NRF

Science and Technology Facilities Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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