The SAMI Galaxy Survey: using tidal streams and shells to trace the dynamical evolution of massive galaxies
ABSTRACT 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 mass...
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://dx.doi.org/10.1093/mnras/stae398 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stae398/56622188/stae398.pdf https://academic.oup.com/mnras/article-pdf/529/2/810/56878897/stae398.pdf |
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croxfordunivpr:10.1093/mnras/stae398 2024-04-28T08:37:21+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 Australian Research Council AAO ERC NRF National Aeronautics and Space Administration National Science Foundation 2024 http://dx.doi.org/10.1093/mnras/stae398 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stae398/56622188/stae398.pdf https://academic.oup.com/mnras/article-pdf/529/2/810/56878897/stae398.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Monthly Notices of the Royal Astronomical Society volume 529, issue 2, page 810-830 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2024 croxfordunivpr https://doi.org/10.1093/mnras/stae398 2024-04-09T07:54:47Z ABSTRACT 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 H${\alpha}$ equivalent width are significantly different, whereas spin ($\lambda _{R_{\rm {e}}}$), 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 $\lambda _{R_{\rm {e}}}$, as expected from simulations. We also find these younger galaxies which are classified as having ‘strong’ shells have lower $\lambda _{R_{\rm {e}}}$. 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 Oxford University Press Monthly Notices of the Royal Astronomical Society 529 2 810 830 |
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Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics 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 |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT 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 H${\alpha}$ equivalent width are significantly different, whereas spin ($\lambda _{R_{\rm {e}}}$), 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 $\lambda _{R_{\rm {e}}}$, as expected from simulations. We also find these younger galaxies which are classified as having ‘strong’ shells have lower $\lambda _{R_{\rm {e}}}$. 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 |
Australian Research Council AAO ERC NRF National Aeronautics and Space Administration National Science Foundation |
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 |
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://dx.doi.org/10.1093/mnras/stae398 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stae398/56622188/stae398.pdf https://academic.oup.com/mnras/article-pdf/529/2/810/56878897/stae398.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 529, issue 2, page 810-830 ISSN 0035-8711 1365-2966 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/mnras/stae398 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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529 |
container_issue |
2 |
container_start_page |
810 |
op_container_end_page |
830 |
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1797568796983033856 |