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 identica...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
arXiv
2019
|
Subjects: | |
Online Access: | https://dx.doi.org/10.48550/arxiv.1909.09306 https://arxiv.org/abs/1909.09306 |
id |
ftdatacite:10.48550/arxiv.1909.09306 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.48550/arxiv.1909.09306 2023-05-15T18:11:44+02:00 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 https://dx.doi.org/10.48550/arxiv.1909.09306 https://arxiv.org/abs/1909.09306 unknown arXiv https://dx.doi.org/10.1093/mnras/stz2237 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics of Galaxies astro-ph.GA FOS Physical sciences article-journal Article ScholarlyArticle Text 2019 ftdatacite https://doi.org/10.48550/arxiv.1909.09306 https://doi.org/10.1093/mnras/stz2237 2022-03-10T16:33:19Z 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. : 15 pages, 14 figures, MNRAS accepted Article in Journal/Newspaper sami DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
spellingShingle |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences 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 |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
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. : 15 pages, 14 figures, MNRAS accepted |
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 |
arXiv |
publishDate |
2019 |
url |
https://dx.doi.org/10.48550/arxiv.1909.09306 https://arxiv.org/abs/1909.09306 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://dx.doi.org/10.1093/mnras/stz2237 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1909.09306 https://doi.org/10.1093/mnras/stz2237 |
_version_ |
1766184370749571072 |