The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies
We use integral-field spectroscopy from the SAMI Galaxy Survey to identify galaxies that show evidence of recent quenching of star formation. The galaxies exhibit strong Balmer absorption in the absence of ongoing star formation in more than 10% of their spectra within the SAMI field of view. These...
Published in: | The Astrophysical Journal |
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American Astronomical Society
2019
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Online Access: | http://hdl.handle.net/1959.3/448392 https://doi.org/10.3847/1538-4357/ab0201 |
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ftswinburne:tle:33108c98-602b-4656-bed1-aae95978d2c9:28f49f06-0da8-44be-9edc-ad1dd0a9c582:1 2023-05-15T18:11:25+02:00 The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies Owers, Matt S. Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, Joss Brough, S. Bryant, Julia J. Cortese, Luca Couch, Warrick J. Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Hopkins, A. M. Lawrence, J. S. Lorente, Nuria P. F. McDermid, Richard M. Medling, Anne M. Richards, Samuel N. Scott, Nicholas Taranu, Dan S. Welker, Charlotte Yi, Sukyoung K. Swinburne University of Technology 2019 http://hdl.handle.net/1959.3/448392 https://doi.org/10.3847/1538-4357/ab0201 unknown American Astronomical Society http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT180100066 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/DP150104329 http://purl.org/au-research/grants/arc/FT180100495 http://purl.org/au-research/grants/arc/DP170100603 http://purl.org/au-research/grants/arc/FT140101202 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE110001020 http://hdl.handle.net/1959.3/448392 https://doi.org/10.3847/1538-4357/ab0201 Copyright © 2019 The American Astronomical Society. All rights reserved. The published version is reproduced in accordance with the copyright policy of the publisher. The Astrophysical Journal, Vol. 873, no. 1 (Mar 2019), article no. 52 Journal article 2019 ftswinburne https://doi.org/10.3847/1538-4357/ab0201 2019-09-07T21:21:37Z We use integral-field spectroscopy from the SAMI Galaxy Survey to identify galaxies that show evidence of recent quenching of star formation. The galaxies exhibit strong Balmer absorption in the absence of ongoing star formation in more than 10% of their spectra within the SAMI field of view. These Hd-strong (HDS) galaxies (HDSGs) are rare, making up only similar to 2% (25/1220) of galaxies with stellar mass log(M-*/M-circle dot) > 10. The HDSGs make up a significant fraction of nonpassive cluster galaxies (15%; 17/115) and a smaller fraction (2.0%; 8/387) of the nonpassive population in low-density environments. The majority (9/17) of cluster HDSGs show evidence of star formation at their centers, with the HDS regions found in the outer parts of the galaxy. Conversely, the HDS signal is more evenly spread across the galaxy for the majority (6/8) of HDSGs in low-density environments and is often associated with emission lines that are not due to star formation. We investigate the location of the HDSGs in the clusters, finding that they are exclusively within 0.6R(200) of the cluster center and have a significantly higher velocity dispersion relative to the cluster population. Comparing their distribution in projected phase space to those derived from cosmological simulations indicates that the cluster HDSGs are consistent with an infalling population that has entered the central 0.5r(200,3D) cluster region within the last similar to 1 Gyr. In the eight of nine cluster HDSGs with central star formation, the extent of star formation is consistent with that expected of outside-in quenching by ram pressure stripping. Our results indicate that the cluster HDSGs are currently being quenched by ram pressure stripping on their first passage through the cluster. Article in Journal/Newspaper sami Swinburne University of Technology: Swinburne Research Bank The Astrophysical Journal 873 1 52 |
institution |
Open Polar |
collection |
Swinburne University of Technology: Swinburne Research Bank |
op_collection_id |
ftswinburne |
language |
unknown |
description |
We use integral-field spectroscopy from the SAMI Galaxy Survey to identify galaxies that show evidence of recent quenching of star formation. The galaxies exhibit strong Balmer absorption in the absence of ongoing star formation in more than 10% of their spectra within the SAMI field of view. These Hd-strong (HDS) galaxies (HDSGs) are rare, making up only similar to 2% (25/1220) of galaxies with stellar mass log(M-*/M-circle dot) > 10. The HDSGs make up a significant fraction of nonpassive cluster galaxies (15%; 17/115) and a smaller fraction (2.0%; 8/387) of the nonpassive population in low-density environments. The majority (9/17) of cluster HDSGs show evidence of star formation at their centers, with the HDS regions found in the outer parts of the galaxy. Conversely, the HDS signal is more evenly spread across the galaxy for the majority (6/8) of HDSGs in low-density environments and is often associated with emission lines that are not due to star formation. We investigate the location of the HDSGs in the clusters, finding that they are exclusively within 0.6R(200) of the cluster center and have a significantly higher velocity dispersion relative to the cluster population. Comparing their distribution in projected phase space to those derived from cosmological simulations indicates that the cluster HDSGs are consistent with an infalling population that has entered the central 0.5r(200,3D) cluster region within the last similar to 1 Gyr. In the eight of nine cluster HDSGs with central star formation, the extent of star formation is consistent with that expected of outside-in quenching by ram pressure stripping. Our results indicate that the cluster HDSGs are currently being quenched by ram pressure stripping on their first passage through the cluster. |
author2 |
Swinburne University of Technology |
format |
Article in Journal/Newspaper |
author |
Owers, Matt S. Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, Joss Brough, S. Bryant, Julia J. Cortese, Luca Couch, Warrick J. Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Hopkins, A. M. Lawrence, J. S. Lorente, Nuria P. F. McDermid, Richard M. Medling, Anne M. Richards, Samuel N. Scott, Nicholas Taranu, Dan S. Welker, Charlotte Yi, Sukyoung K. |
spellingShingle |
Owers, Matt S. Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, Joss Brough, S. Bryant, Julia J. Cortese, Luca Couch, Warrick J. Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Hopkins, A. M. Lawrence, J. S. Lorente, Nuria P. F. McDermid, Richard M. Medling, Anne M. Richards, Samuel N. Scott, Nicholas Taranu, Dan S. Welker, Charlotte Yi, Sukyoung K. The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
author_facet |
Owers, Matt S. Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, Joss Brough, S. Bryant, Julia J. Cortese, Luca Couch, Warrick J. Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Hopkins, A. M. Lawrence, J. S. Lorente, Nuria P. F. McDermid, Richard M. Medling, Anne M. Richards, Samuel N. Scott, Nicholas Taranu, Dan S. Welker, Charlotte Yi, Sukyoung K. |
author_sort |
Owers, Matt S. |
title |
The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
title_short |
The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
title_full |
The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
title_fullStr |
The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: Quenching of star formation in Clusters I. transition galaxies |
title_sort |
sami galaxy survey: quenching of star formation in clusters i. transition galaxies |
publisher |
American Astronomical Society |
publishDate |
2019 |
url |
http://hdl.handle.net/1959.3/448392 https://doi.org/10.3847/1538-4357/ab0201 |
genre |
sami |
genre_facet |
sami |
op_source |
The Astrophysical Journal, Vol. 873, no. 1 (Mar 2019), article no. 52 |
op_relation |
http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/FT140101166 http://purl.org/au-research/grants/arc/FT180100231 http://purl.org/au-research/grants/arc/FT180100066 http://purl.org/au-research/grants/arc/FL140100278 http://purl.org/au-research/grants/arc/DP150104329 http://purl.org/au-research/grants/arc/FT180100495 http://purl.org/au-research/grants/arc/DP170100603 http://purl.org/au-research/grants/arc/FT140101202 http://purl.org/au-research/grants/arc/CE170100013 http://purl.org/au-research/grants/arc/CE110001020 http://hdl.handle.net/1959.3/448392 https://doi.org/10.3847/1538-4357/ab0201 |
op_rights |
Copyright © 2019 The American Astronomical Society. All rights reserved. The published version is reproduced in accordance with the copyright policy of the publisher. |
op_doi |
https://doi.org/10.3847/1538-4357/ab0201 |
container_title |
The Astrophysical Journal |
container_volume |
873 |
container_issue |
1 |
container_start_page |
52 |
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1766184083779485696 |