Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys
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,...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Online Access: | https://hull-repository.worktribe.com/file/2503020/1/Published%20article https://hull-repository.worktribe.com/output/2503020 https://doi.org/10.1093/mnras/stz2237 |
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ftunivhullir:oai:hull-repository.worktribe.com:2503020 2024-09-15T18:33:22+00:00 Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys Phillipps, Steven Cortese, Luca Wong, O. Ivy Brough, Sarah Brown, Michael J. I. Bryant, Julia 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. Sweet, Sarah M. Van De Sande, Jesse Moffett, Amanda J. Robotham, Aaron S. G. Driver, Simon P. Bremer, Malcolm N. Conselice, Christopher J. Richards, Samuel N. 2019-08-12 https://hull-repository.worktribe.com/file/2503020/1/Published%20article https://hull-repository.worktribe.com/output/2503020 https://doi.org/10.1093/mnras/stz2237 English eng Oxford University Press https://hull-repository.worktribe.com/output/2503020 Monthly Notices of the Royal Astronomical Society Volume 489 Issue 2 Pagination 2830–2843 doi:https://doi.org/10.1093/mnras/stz2237 https://hull-repository.worktribe.com/file/2503020/1/Published%20article 0035-8711 doi:10.1093/mnras/stz2237 openAccess Space and planetary science Astronomy and astrophysics Surveys Galaxies: dwarf Galaxies: fundamental parameters Galaxies: structure Journal Article acceptedVersion publishedVersion 2019 ftunivhullir https://doi.org/10.1093/mnras/stz2237 2024-07-22T14:05:21Z 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. Article in Journal/Newspaper sami University of Hull: Repository@Hull Monthly Notices of the Royal Astronomical Society 489 2 2830 2843 |
institution |
Open Polar |
collection |
University of Hull: Repository@Hull |
op_collection_id |
ftunivhullir |
language |
English |
topic |
Space and planetary science Astronomy and astrophysics Surveys Galaxies: dwarf Galaxies: fundamental parameters Galaxies: structure |
spellingShingle |
Space and planetary science Astronomy and astrophysics Surveys Galaxies: dwarf Galaxies: fundamental parameters Galaxies: structure Phillipps, Steven Cortese, Luca Wong, O. Ivy Brough, Sarah Brown, Michael J. I. Bryant, Julia 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. Sweet, Sarah M. Van De Sande, Jesse Moffett, Amanda J. Robotham, Aaron S. G. Driver, Simon P. Bremer, Malcolm N. Conselice, Christopher J. Richards, Samuel N. Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
topic_facet |
Space and planetary science Astronomy and astrophysics Surveys Galaxies: dwarf Galaxies: fundamental parameters Galaxies: structure |
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, 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. |
format |
Article in Journal/Newspaper |
author |
Phillipps, Steven Cortese, Luca Wong, O. Ivy Brough, Sarah Brown, Michael J. I. Bryant, Julia 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. Sweet, Sarah M. Van De Sande, Jesse Moffett, Amanda J. Robotham, Aaron S. G. Driver, Simon P. Bremer, Malcolm N. Conselice, Christopher J. Richards, Samuel N. |
author_facet |
Phillipps, Steven Cortese, Luca Wong, O. Ivy Brough, Sarah Brown, Michael J. I. Bryant, Julia 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. Sweet, Sarah M. Van De Sande, Jesse Moffett, Amanda J. Robotham, Aaron S. G. Driver, Simon P. Bremer, Malcolm N. Conselice, Christopher J. Richards, Samuel N. |
author_sort |
Phillipps, Steven |
title |
Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
title_short |
Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
title_full |
Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
title_fullStr |
Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
title_full_unstemmed |
Star-Forming, Rotating Spheroidal Galaxies in the GAMA and SAMI Surveys |
title_sort |
star-forming, rotating spheroidal galaxies in the gama and sami surveys |
publisher |
Oxford University Press |
publishDate |
2019 |
url |
https://hull-repository.worktribe.com/file/2503020/1/Published%20article https://hull-repository.worktribe.com/output/2503020 https://doi.org/10.1093/mnras/stz2237 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://hull-repository.worktribe.com/output/2503020 Monthly Notices of the Royal Astronomical Society Volume 489 Issue 2 Pagination 2830–2843 doi:https://doi.org/10.1093/mnras/stz2237 https://hull-repository.worktribe.com/file/2503020/1/Published%20article 0035-8711 doi:10.1093/mnras/stz2237 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1093/mnras/stz2237 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
489 |
container_issue |
2 |
container_start_page |
2830 |
op_container_end_page |
2843 |
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1810475080892809216 |