The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment
ABSTRACT We use the SAMI Galaxy Survey to examine the drivers of galaxy spin, $\lambda _{R_{\rm e}}$, in a multidimensional parameter space including stellar mass, stellar population age (or specific star formation rate), and various environmental metrics (local density, halo mass, satellite versus...
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2024
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Online Access: | http://dx.doi.org/10.1093/mnras/stae458 https://academic.oup.com/mnras/article-pdf/529/4/3446/57074935/stae458.pdf |
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croxfordunivpr:10.1093/mnras/stae458 2024-04-28T08:37:21+00:00 The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment Croom, Scott M van de Sande, Jesse Vaughan, Sam P Rutherford, Tomas H Lagos, Claudia del P Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Cortese, Luca D’Eugenio, Francesco Fraser-McKelvie, Amelia Goodwin, Michael Lorente, Nuria P F Richards, Samuel N Ristea, Andrei Sweet, Sarah M Yi, Sukyoung K Zafar, Tayyaba STFC Australian Research Council AAO Australian Government National Research Foundation of Korea SIRF Science and Technology Facilities Council ERC 2024 http://dx.doi.org/10.1093/mnras/stae458 https://academic.oup.com/mnras/article-pdf/529/4/3446/57074935/stae458.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Monthly Notices of the Royal Astronomical Society volume 529, issue 4, page 3446-3468 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2024 croxfordunivpr https://doi.org/10.1093/mnras/stae458 2024-04-09T07:58:25Z ABSTRACT We use the SAMI Galaxy Survey to examine the drivers of galaxy spin, $\lambda _{R_{\rm e}}$, in a multidimensional parameter space including stellar mass, stellar population age (or specific star formation rate), and various environmental metrics (local density, halo mass, satellite versus central). Using a partial correlation analysis, we consistently find that age or specific star formation rate is the primary parameter correlating with spin. Light-weighted age and specific star formation rate are more strongly correlated with spin than mass-weighted age. In fact, across our sample, once the relation between light-weighted age and spin is accounted for, there is no significant residual correlation between spin and mass, or spin and environment. This result is strongly suggestive that the present-day environment only indirectly influences spin, via the removal of gas and star formation quenching. That is, environment affects age, then age affects spin. Older galaxies then have lower spin, either due to stars being born dynamically hotter at high redshift, or due to secular heating. Our results appear to rule out environmentally dependent dynamical heating (e.g. galaxy–galaxy interactions) being important, at least within 1 Re where our kinematic measurements are made. The picture is more complex when we only consider high-mass galaxies (M* ≳ 1011 M⊙). While the age-spin relation is still strong for these high-mass galaxies, there is a residual environmental trend with central galaxies preferentially having lower spin, compared to satellites of the same age and mass. We argue that this trend is likely due to central galaxies being a preferred location for mergers. Article in Journal/Newspaper sami Oxford University Press Monthly Notices of the Royal Astronomical Society 529 4 3446 3468 |
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Open Polar |
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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 Croom, Scott M van de Sande, Jesse Vaughan, Sam P Rutherford, Tomas H Lagos, Claudia del P Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Cortese, Luca D’Eugenio, Francesco Fraser-McKelvie, Amelia Goodwin, Michael Lorente, Nuria P F Richards, Samuel N Ristea, Andrei Sweet, Sarah M Yi, Sukyoung K Zafar, Tayyaba The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT We use the SAMI Galaxy Survey to examine the drivers of galaxy spin, $\lambda _{R_{\rm e}}$, in a multidimensional parameter space including stellar mass, stellar population age (or specific star formation rate), and various environmental metrics (local density, halo mass, satellite versus central). Using a partial correlation analysis, we consistently find that age or specific star formation rate is the primary parameter correlating with spin. Light-weighted age and specific star formation rate are more strongly correlated with spin than mass-weighted age. In fact, across our sample, once the relation between light-weighted age and spin is accounted for, there is no significant residual correlation between spin and mass, or spin and environment. This result is strongly suggestive that the present-day environment only indirectly influences spin, via the removal of gas and star formation quenching. That is, environment affects age, then age affects spin. Older galaxies then have lower spin, either due to stars being born dynamically hotter at high redshift, or due to secular heating. Our results appear to rule out environmentally dependent dynamical heating (e.g. galaxy–galaxy interactions) being important, at least within 1 Re where our kinematic measurements are made. The picture is more complex when we only consider high-mass galaxies (M* ≳ 1011 M⊙). While the age-spin relation is still strong for these high-mass galaxies, there is a residual environmental trend with central galaxies preferentially having lower spin, compared to satellites of the same age and mass. We argue that this trend is likely due to central galaxies being a preferred location for mergers. |
author2 |
STFC Australian Research Council AAO Australian Government National Research Foundation of Korea SIRF Science and Technology Facilities Council ERC |
format |
Article in Journal/Newspaper |
author |
Croom, Scott M van de Sande, Jesse Vaughan, Sam P Rutherford, Tomas H Lagos, Claudia del P Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Cortese, Luca D’Eugenio, Francesco Fraser-McKelvie, Amelia Goodwin, Michael Lorente, Nuria P F Richards, Samuel N Ristea, Andrei Sweet, Sarah M Yi, Sukyoung K Zafar, Tayyaba |
author_facet |
Croom, Scott M van de Sande, Jesse Vaughan, Sam P Rutherford, Tomas H Lagos, Claudia del P Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Cortese, Luca D’Eugenio, Francesco Fraser-McKelvie, Amelia Goodwin, Michael Lorente, Nuria P F Richards, Samuel N Ristea, Andrei Sweet, Sarah M Yi, Sukyoung K Zafar, Tayyaba |
author_sort |
Croom, Scott M |
title |
The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
title_short |
The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
title_full |
The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
title_fullStr |
The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
title_full_unstemmed |
The SAMI Galaxy Survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
title_sort |
sami galaxy survey: galaxy spin is more strongly correlated with stellar population age than mass or environment |
publisher |
Oxford University Press (OUP) |
publishDate |
2024 |
url |
http://dx.doi.org/10.1093/mnras/stae458 https://academic.oup.com/mnras/article-pdf/529/4/3446/57074935/stae458.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 529, issue 4, page 3446-3468 ISSN 0035-8711 1365-2966 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/mnras/stae458 |
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Monthly Notices of the Royal Astronomical Society |
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529 |
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4 |
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3446 |
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3468 |
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