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...
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creator | Rutherford, Tomas H van de Sande, Jesse Croom, Scott M Valenzuela, Lucas M Rhea-Silvia Remus 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 |
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 utilise deep imaging from the Subaru-Hyper Suprime Cam Wide data to search for tidal features in massive (\(\log_{10}(M_*/M_{\odot}) > 10\)) 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 \(31\pm 2\) percent 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 (\(\lambda_{R_e}\)), 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 \(\lambda_{R_e}\), as expected from simulations. We also find these younger galaxies which are classified as having "strong" shells have lower \(\lambda_{R_e}\). However, simulations suggest that merger features become undetectable within \(\sim 2-4\) 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. |
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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 utilise deep imaging from the Subaru-Hyper Suprime Cam Wide data to search for tidal features in massive (\(\log_{10}(M_*/M_{\odot}) > 10\)) 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 \(31\pm 2\) percent 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 (\(\lambda_{R_e}\)), 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 \(\lambda_{R_e}\), as expected from simulations. We also find these younger galaxies which are classified as having "strong" shells have lower \(\lambda_{R_e}\). However, simulations suggest that merger features become undetectable within \(\sim 2-4\) 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.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2402.02728</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Acquisitions & mergers ; Data search ; Ellipticity ; Galactic evolution ; Galaxies ; Physics - Astrophysics of Galaxies ; Simulation ; Stars & galaxies ; Stellar age ; Stellar mass ; Tidal effects</subject><ispartof>arXiv.org, 2024-02</ispartof><rights>2024. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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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 \(\lambda_{R_e}\), as expected from simulations. We also find these younger galaxies which are classified as having "strong" shells have lower \(\lambda_{R_e}\). However, simulations suggest that merger features become undetectable within \(\sim 2-4\) Gyr post-merger. 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van de Sande, Jesse ; Croom, Scott M ; Valenzuela, Lucas M ; Rhea-Silvia Remus ; 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><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a520-a31054447d15772a0bbb96ca42f3643f673f67c4b8854e6509cee8dbe82719f23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Acquisitions & mergers</topic><topic>Data search</topic><topic>Ellipticity</topic><topic>Galactic evolution</topic><topic>Galaxies</topic><topic>Physics - Astrophysics of Galaxies</topic><topic>Simulation</topic><topic>Stars & galaxies</topic><topic>Stellar age</topic><topic>Stellar mass</topic><topic>Tidal effects</topic><toplevel>online_resources</toplevel><creatorcontrib>Rutherford, Tomas H</creatorcontrib><creatorcontrib>van de Sande, Jesse</creatorcontrib><creatorcontrib>Croom, Scott M</creatorcontrib><creatorcontrib>Valenzuela, Lucas M</creatorcontrib><creatorcontrib>Rhea-Silvia Remus</creatorcontrib><creatorcontrib>D'Eugenio, Francesco</creatorcontrib><creatorcontrib>Vaughan, Sam P</creatorcontrib><creatorcontrib>Zovaro, Henry R M</creatorcontrib><creatorcontrib>Casura, Sarah</creatorcontrib><creatorcontrib>Barsanti, Stefania</creatorcontrib><creatorcontrib>Bland-Hawthorn, Joss</creatorcontrib><creatorcontrib>Brough, Sarah</creatorcontrib><creatorcontrib>Bryant, Julia J</creatorcontrib><creatorcontrib>Goodwin, Michael</creatorcontrib><creatorcontrib>Lorente, Nuria</creatorcontrib><creatorcontrib>Oh, Sree</creatorcontrib><creatorcontrib>Ristea, Andrei</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rutherford, Tomas H</au><au>van de Sande, Jesse</au><au>Croom, Scott M</au><au>Valenzuela, Lucas M</au><au>Rhea-Silvia Remus</au><au>D'Eugenio, Francesco</au><au>Vaughan, Sam P</au><au>Zovaro, Henry R M</au><au>Casura, Sarah</au><au>Barsanti, Stefania</au><au>Bland-Hawthorn, Joss</au><au>Brough, Sarah</au><au>Bryant, Julia J</au><au>Goodwin, Michael</au><au>Lorente, Nuria</au><au>Oh, Sree</au><au>Ristea, Andrei</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The SAMI Galaxy Survey: Using Tidal Streams and Shells to Trace the Dynamical Evolution of Massive Galaxies</atitle><jtitle>arXiv.org</jtitle><date>2024-02-05</date><risdate>2024</risdate><eissn>2331-8422</eissn><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. 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subjects | Acquisitions & mergers Data search Ellipticity Galactic evolution Galaxies Physics - Astrophysics of Galaxies Simulation Stars & galaxies Stellar age Stellar mass Tidal effects |
title | The SAMI Galaxy Survey: Using Tidal Streams and Shells to Trace the Dynamical Evolution of Massive Galaxies |
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