| Title: |
Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys |
| Authors: |
Moffett, Amanda J.; Phillipps, Steven; Robotham, Aaron S. G.; Driver, Simon P.; Bremer, Malcolm N.; Cortese, Luca; Wong, O. Ivy; Brough, Sarah; Brown, Michael J.; Bryant, Julia J.; Conselice, Christopher J.; Croom, Scott M.; George, Koshy; Goldstein, Greg; Goodwin, Michael; Holwerda, Benne W.; Hopkins, Andrew M.; Konstantopoulos, Iraklis S.; Lawrence, Jon S.; Lorente, Nuria P. F.; Medling, Anne M.; Owers, Matt S.; Pimbblet, Kevin A.; Richards, Samuel N.; Sweet, Sarah M.; van de Sande, Jesse |
| Publisher Information: |
Oxford University Press |
| Publication Year: |
2019 |
| Collection: |
The University of Queensland: UQ eSpace |
| Subject Terms: |
Mass Assembly Gama; Compact Dwarf Galaxies; Integral Field Spectroscopy; Multi-Gaussian Expansion; Data Release; Virgo Cluster; Elliptic Galaxies; Morphological Classifications; Luminosity Functions; Sauron Project |
| Description: |
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, massto-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 similar to 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 S ' ersic 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
0035-8711; 1365-2966 |
| Relation: |
orcid:0000-0002-1576-2505; Not set; FT180100066; CE170100013; FT140101166; FT140100255; HST-HF2-51377; FL140100278; NAS5-26555 |
| Availability: |
https://espace.library.uq.edu.au/view/UQ:72c0a4c/UQ72c0a4c_OA.pdf; https://espace.library.uq.edu.au/view/UQ:72c0a4c |
| Accession Number: |
edsbas.F838975D |
| Database: |
BASE |