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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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/18424 2024-09-09T20:06:09+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 University of St Andrews.School of Physics and Astronomy 2019-09-05T09:30:01Z 14 3965378 application/pdf https://hdl.handle.net/10023/18424 https://doi.org/10.1093/mnras/stz2237 eng eng Monthly Notices of the Royal Astronomical Society 260747171 65d3d335-5e3b-4f2f-8bca-361051b6c4e0 85075173707 Moffett , A J , Phillipps , S , Robotham , A S G , Driver , S P , Bremer , M N , Cortese , L , Wong , O I , Brough , S , Brown , M J I , Bryant , J J , Conselice , C J , Croom , S M , George , K , Goldstein , G , Goodwin , M , Holwerda , B W , Hopkins , A M , Konstantopoulos , I S , Lawrence , J S , Lorente , N P F , Medling , A M , Owers , M S , Pimbblet , K A , Richards , S N , Sweet , S M & Van De Sande , J 2019 , ' Star-forming, rotating spheroidal galaxies in the GAMA and SAMI Surveys ' , Monthly Notices of the Royal Astronomical Society , vol. 489 , no. 2 , pp. 2830–2843 . https://doi.org/10.1093/mnras/stz2237 0035-8711 crossref: 10.1093/mnras/stz2237 https://hdl.handle.net/10023/18424 doi:10.1093/mnras/stz2237 Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stz2237 Surveys Galaxies: dwarf Galaxies: structure Galaxies: fundamental paramaters QB Astronomy QC Physics 3rd-DAS QB QC Journal article 2019 ftstandrewserep https://doi.org/10.1093/mnras/stz2237 2024-08-28T00:12:18Z 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% of LBS galaxies live in isolation. Using deep, high-resolution imaging from VST KiDS and the new Bayesian, two-dimensional galaxy profile modeling 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. Peer reviewed Article in Journal/Newspaper sami University of St Andrews: Digital Research Repository Monthly Notices of the Royal Astronomical Society 489 2 2830 2843 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Surveys Galaxies: dwarf Galaxies: structure Galaxies: fundamental paramaters QB Astronomy QC Physics 3rd-DAS QB QC |
spellingShingle |
Surveys Galaxies: dwarf Galaxies: structure Galaxies: fundamental paramaters QB Astronomy QC Physics 3rd-DAS QB QC 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: structure Galaxies: fundamental paramaters QB Astronomy QC Physics 3rd-DAS QB QC |
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% of LBS galaxies live in isolation. Using deep, high-resolution imaging from VST KiDS and the new Bayesian, two-dimensional galaxy profile modeling 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. Peer reviewed |
author2 |
University of St Andrews.School of Physics and Astronomy |
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 |
publishDate |
2019 |
url |
https://hdl.handle.net/10023/18424 https://doi.org/10.1093/mnras/stz2237 |
genre |
sami |
genre_facet |
sami |
op_relation |
Monthly Notices of the Royal Astronomical Society 260747171 65d3d335-5e3b-4f2f-8bca-361051b6c4e0 85075173707 Moffett , A J , Phillipps , S , Robotham , A S G , Driver , S P , Bremer , M N , Cortese , L , Wong , O I , Brough , S , Brown , M J I , Bryant , J J , Conselice , C J , Croom , S M , George , K , Goldstein , G , Goodwin , M , Holwerda , B W , Hopkins , A M , Konstantopoulos , I S , Lawrence , J S , Lorente , N P F , Medling , A M , Owers , M S , Pimbblet , K A , Richards , S N , Sweet , S M & Van De Sande , J 2019 , ' Star-forming, rotating spheroidal galaxies in the GAMA and SAMI Surveys ' , Monthly Notices of the Royal Astronomical Society , vol. 489 , no. 2 , pp. 2830–2843 . https://doi.org/10.1093/mnras/stz2237 0035-8711 crossref: 10.1093/mnras/stz2237 https://hdl.handle.net/10023/18424 doi:10.1093/mnras/stz2237 |
op_rights |
Copyright © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/stz2237 |
op_doi |
https://doi.org/10.1093/mnras/stz2237 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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489 |
container_issue |
2 |
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2830 |
op_container_end_page |
2843 |
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1809938535046709248 |