Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys

Author:

Moffett Amanda J12,Phillipps Steven3ORCID,Robotham Aaron S G4ORCID,Driver Simon P4,Bremer Malcolm N3,Cortese Luca45ORCID,Wong O Ivy4,Brough Sarah6ORCID,Brown Michael J I7ORCID,Bryant Julia J589,Conselice Christopher J10,Croom Scott M56ORCID,George Koshy1112ORCID,Goldstein Greg13,Goodwin Michael9,Holwerda Benne W14ORCID,Hopkins Andrew M15,Konstantopoulos Iraklis S16,Lawrence Jon S15,Lorente Nuria P F9,Medling Anne M1718ORCID,Owers Matt S12,Pimbblet Kevin A19,Richards Samuel N20ORCID,Sweet Sarah M521ORCID,van de Sande Jesse58ORCID

Affiliation:

1. Department of Physics and Astronomy, Vanderbilt University, PMB 401807 2401 Vanderbilt Place, Nashville TN 37240, USA

2. Department of Physics and Astronomy, University of North Georgia, 3820 Mundy Mill Rd., Oakwood GA 30566, USA

3. School of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK

4. ICRAR, The University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia

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

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

7. School of Physics and Astronomy, Monash University, VIC 3800, Australia

8. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia

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

10. School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK

11. Indian Institute of Astrophysics, 2nd Block, Koramangala, Bangalore 560034, India

12. Department of Physics, Christ University, Hosur Road, Bangalore 560029, India

13. Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia

14. Department of Physics and Astronomy, 102 Natural Science Building, University of Louisville, Louisville KY 40292, USA

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

16. Atlassian, 341 George St Sydney, NSW 2000, Australia

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

18. Research School for Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia

19. E. A. Milne Centre for Astrophysics, University of Hull, Cottingham Road, Kingston-upon-Hull, HU6 7RX, UK

20. SOFIA Science Center, USRA, NASA Ames Research Center, Building N232, M/S 232-12, P.O. Box 1, Moffett Field, CA 94035-0001, USA

21. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia

Abstract

ABSTRACT The Galaxy And Mass Assembly (GAMA) survey has morphologically identified a class of ‘Little Blue Spheroid’ (LBS) galaxies whose relationship to other classes of galaxies we now examine in detail. Considering a sample of 868 LBSs, we find that such galaxies display similar but not identical colours, specific star formation rates, stellar population ages, mass-to-light ratios, and metallicities to Sd-Irr galaxies. We also find that LBSs typically occupy environments of even lower density than those of Sd-Irr galaxies, where ∼65 per cent of LBS galaxies live in isolation. Using deep, high-resolution imaging from VST KiDS and the new Bayesian, 2D galaxy profile modelling code profit, we further examine the detailed structure of LBSs and find that their Sérsic indices, sizes, and axial ratios are compatible with those of low-mass elliptical galaxies. We then examine SAMI Galaxy survey integral field emission line kinematics for a subset of 62 LBSs and find that the majority (42) of these galaxies display ordered rotation with the remainder displaying disturbed/non-ordered dynamics. Finally, we consider potential evolutionary scenarios for a population with this unusual combination of properties, concluding that LBSs are likely formed by a mixture of merger and accretion processes still recently active in low-redshift dwarf populations. We also infer that if LBS-like galaxies were subjected to quenching in a rich environment, they would plausibly resemble cluster dwarf ellipticals.

Funder

Vanderbilt University Stevenson Postdoctoral Fellowship

Australian Research Council

National Aeronautics and Space Administration

Space Telescope Science Institute

University of Sydney

European Southern Observatory

Universidade Nova de Lisboa

Università degli Studi di Padova

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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