The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies
Slow rotator galaxies are distinct amongst galaxy populations, with simulations suggesting that a mix of minor and major mergers are responsible for their formation. A promising path to resolve outstanding questions on the type of merger responsible, is by investigating deep imaging of massive galax...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2024
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Online Access: | http://hdl.handle.net/1959.3/477771 https://doi.org/10.1093/mnras/stae398 |
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ftswinburne:tle:342e5b5d-a49a-48a0-a60b-f0ed2590446e:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2024-04-14T08:18:57+00:00 The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies Rutherford, Tomas H. van de Sande, Jesse Croom, Scott M. Valenzuela, Lucas M. Remus, Rhea-Silvia D Eugenio, Francesco Vaughan, Sam P. Zovaro, Henry R. M. Casura, Sarah Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Goodwin, Michael Lorente, Nuria Oh, Sree Ristea, Andrei Swinburne University of Technology 2024 http://hdl.handle.net/1959.3/477771 https://doi.org/10.1093/mnras/stae398 unknown Oxford University Press (OUP) http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE110001020 http://purl.org/au-research/grants/arc/DE200100461 http://purl.org/au-research/grants/arc/FT180100231 http://hdl.handle.net/1959.3/477771 https://doi.org/10.1093/mnras/stae398 Copyright © 2024. Monthly Notices of the Royal Astronomical Society, Vol. 529, no. 2 (Mar 2024), pp. 810-830 Journal article 2024 ftswinburne https://doi.org/10.1093/mnras/stae398 2024-03-20T00:40:03Z Slow rotator galaxies are distinct amongst galaxy populations, with simulations suggesting that a mix of minor and major mergers are responsible for their formation. A promising path to resolve outstanding questions on the type of merger responsible, is by investigating deep imaging of massive galaxies for signs of potential merger remnants. We utilize deep imaging from the Subaru-Hyper Suprime Cam Wide data to search for tidal features in massive [log10(M∗/M☉) > 10] early-type galaxies (ETGs) in the SAMI Galaxy Survey. We perform a visual check for tidal features on images where the galaxy has been subtracted using a Multi-Gauss Expansion (MGE) model. We find that 31−2+2 per cent of our sample show tidal features. When comparing galaxies with and without features, we find that the distributions in stellar mass, light-weighted mean stellar population age, and Hα equivalent width are significantly different, whereas spin (λRe), ellipticity, and bulge-to-total ratio have similar distributions. When splitting our sample in age, we find that galaxies below the median age (10.8 Gyr) show a correlation between the presence of shells and lower λRe, as expected from simulations. We also find these younger galaxies which are classified as having ‘strong’ shells have lower λRe. However, simulations suggest that merger features become undetectable within ∼2–4 Gyr post-merger. This implies that the relationship between tidal features and merger history disappears for galaxies with older stellar ages, i.e. those that are more likely to have merged long ago. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank Monthly Notices of the Royal Astronomical Society 529 2 810 830 |
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Swinburne University of Technology: Swinburne Research Bank |
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ftswinburne |
language |
unknown |
description |
Slow rotator galaxies are distinct amongst galaxy populations, with simulations suggesting that a mix of minor and major mergers are responsible for their formation. A promising path to resolve outstanding questions on the type of merger responsible, is by investigating deep imaging of massive galaxies for signs of potential merger remnants. We utilize deep imaging from the Subaru-Hyper Suprime Cam Wide data to search for tidal features in massive [log10(M∗/M☉) > 10] early-type galaxies (ETGs) in the SAMI Galaxy Survey. We perform a visual check for tidal features on images where the galaxy has been subtracted using a Multi-Gauss Expansion (MGE) model. We find that 31−2+2 per cent of our sample show tidal features. When comparing galaxies with and without features, we find that the distributions in stellar mass, light-weighted mean stellar population age, and Hα equivalent width are significantly different, whereas spin (λRe), ellipticity, and bulge-to-total ratio have similar distributions. When splitting our sample in age, we find that galaxies below the median age (10.8 Gyr) show a correlation between the presence of shells and lower λRe, as expected from simulations. We also find these younger galaxies which are classified as having ‘strong’ shells have lower λRe. However, simulations suggest that merger features become undetectable within ∼2–4 Gyr post-merger. This implies that the relationship between tidal features and merger history disappears for galaxies with older stellar ages, i.e. those that are more likely to have merged long ago. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Rutherford, Tomas H. van de Sande, Jesse Croom, Scott M. Valenzuela, Lucas M. Remus, Rhea-Silvia D Eugenio, Francesco Vaughan, Sam P. Zovaro, Henry R. M. Casura, Sarah Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Goodwin, Michael Lorente, Nuria Oh, Sree Ristea, Andrei |
spellingShingle |
Rutherford, Tomas H. van de Sande, Jesse Croom, Scott M. Valenzuela, Lucas M. Remus, Rhea-Silvia D Eugenio, Francesco Vaughan, Sam P. Zovaro, Henry R. M. Casura, Sarah Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Goodwin, Michael Lorente, Nuria Oh, Sree Ristea, Andrei The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
author_facet |
Rutherford, Tomas H. van de Sande, Jesse Croom, Scott M. Valenzuela, Lucas M. Remus, Rhea-Silvia D Eugenio, Francesco Vaughan, Sam P. Zovaro, Henry R. M. Casura, Sarah Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J. Goodwin, Michael Lorente, Nuria Oh, Sree Ristea, Andrei |
author_sort |
Rutherford, Tomas H. |
title |
The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
title_short |
The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
title_full |
The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
title_fullStr |
The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
title_sort |
sami galaxy survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies |
publisher |
Oxford University Press (OUP) |
publishDate |
2024 |
url |
http://hdl.handle.net/1959.3/477771 https://doi.org/10.1093/mnras/stae398 |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society, Vol. 529, no. 2 (Mar 2024), pp. 810-830 |
op_relation |
http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE110001020 http://purl.org/au-research/grants/arc/DE200100461 http://purl.org/au-research/grants/arc/FT180100231 http://hdl.handle.net/1959.3/477771 https://doi.org/10.1093/mnras/stae398 |
op_rights |
Copyright © 2024. |
op_doi |
https://doi.org/10.1093/mnras/stae398 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
529 |
container_issue |
2 |
container_start_page |
810 |
op_container_end_page |
830 |
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1796318533181767680 |