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://doi.org/10.1093/mnras/stz2237 https://nottingham-repository.worktribe.com/file/3444344/1/Star-forming,%20rotating%20spheroidal%20galaxies https://nottingham-repository.worktribe.com/output/3444344 |
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ftunnottinghamrr:oai:nottingham-repository.worktribe.com:3444344 2024-09-15T18:33:22+00:00 Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys 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.I. 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 2019-01-01 https://doi.org/10.1093/mnras/stz2237 https://nottingham-repository.worktribe.com/file/3444344/1/Star-forming,%20rotating%20spheroidal%20galaxies https://nottingham-repository.worktribe.com/output/3444344 unknown Oxford University Press https://nottingham-repository.worktribe.com/output/3444344 Monthly Notices of the Royal Astronomical Society Volume 489 Issue 2 Pagination 2830-2843 doi:https://doi.org/10.1093/mnras/stz2237 https://nottingham-repository.worktribe.com/file/3444344/1/Star-forming,%20rotating%20spheroidal%20galaxies 0035-8711 doi:10.1093/mnras/stz2237 openAccess Surveys Galaxies Dwarf galaxies Fundamental parameters Structure Journal Article publishedVersion 2019 ftunnottinghamrr https://doi.org/10.1093/mnras/stz2237 2024-06-24T14:11:24Z 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 Nottingham: Repository@Nottingham Monthly Notices of the Royal Astronomical Society 489 2 2830 2843 |
institution |
Open Polar |
collection |
University of Nottingham: Repository@Nottingham |
op_collection_id |
ftunnottinghamrr |
language |
unknown |
topic |
Surveys Galaxies Dwarf galaxies Fundamental parameters Structure |
spellingShingle |
Surveys Galaxies Dwarf galaxies Fundamental parameters Structure 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.I. 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 Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys |
topic_facet |
Surveys Galaxies Dwarf galaxies Fundamental parameters 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 |
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.I. 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 |
author_facet |
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.I. 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 |
author_sort |
Moffett, Amanda J. |
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://doi.org/10.1093/mnras/stz2237 https://nottingham-repository.worktribe.com/file/3444344/1/Star-forming,%20rotating%20spheroidal%20galaxies https://nottingham-repository.worktribe.com/output/3444344 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://nottingham-repository.worktribe.com/output/3444344 Monthly Notices of the Royal Astronomical Society Volume 489 Issue 2 Pagination 2830-2843 doi:https://doi.org/10.1093/mnras/stz2237 https://nottingham-repository.worktribe.com/file/3444344/1/Star-forming,%20rotating%20spheroidal%20galaxies 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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1810475080714551296 |