Star-forming, rotating spheroidal galaxies in the GAMA and SAMI surveys
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...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2019
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Online Access: | http://dx.doi.org/10.1093/mnras/stz2237 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stz2237/29149596/stz2237.pdf http://academic.oup.com/mnras/article-pdf/489/2/2830/29960760/stz2237.pdf |
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croxfordunivpr:10.1093/mnras/stz2237 2024-06-23T07:56:32+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 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 2019 http://dx.doi.org/10.1093/mnras/stz2237 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stz2237/29149596/stz2237.pdf http://academic.oup.com/mnras/article-pdf/489/2/2830/29960760/stz2237.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society volume 489, issue 2, page 2830-2843 ISSN 0035-8711 1365-2966 journal-article 2019 croxfordunivpr https://doi.org/10.1093/mnras/stz2237 2024-06-11T04:19:03Z 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. Article in Journal/Newspaper sami Oxford University Press Monthly Notices of the Royal Astronomical Society 489 2 2830 2843 |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
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. |
author2 |
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 |
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 |
spellingShingle |
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 |
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 (OUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1093/mnras/stz2237 http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stz2237/29149596/stz2237.pdf http://academic.oup.com/mnras/article-pdf/489/2/2830/29960760/stz2237.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 489, issue 2, page 2830-2843 ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
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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1802649673935093760 |