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...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/232499 2024-01-14T10:10:22+01:00 The SAMI Galaxy Survey: Quenching of Star Formation in Clusters I. Transition Galaxies Owers, Matthew Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, J. Brough, Sarah Bryant, Julia J. Cortese, L. Couch, Warrick Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Allan Medling, Anne application/pdf http://hdl.handle.net/1885/232499 https://doi.org/10.3847/1538-4357/ab0201 https://openresearch-repository.anu.edu.au/bitstream/1885/232499/3/1901.08185.pdf.jpg en_AU eng IOP Publishing 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/DP170100603 http://purl.org/au-research/grants/arc/FT180100495 http://purl.org/au-research/grants/arc/FT140101202 0004-637X http://hdl.handle.net/1885/232499 doi:10.3847/1538-4357/ab0201 https://openresearch-repository.anu.edu.au/bitstream/1885/232499/3/1901.08185.pdf.jpg © 2019 The American Astronomical Society The Astrophysical Journal galaxies: clusters: general galaxies: evolution galaxies: star formation Journal article ftanucanberra https://doi.org/10.3847/1538-4357/ab0201 2023-12-15T09:37:32Z 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. M.S.O. acknowledges the funding support from the Australian Research Council through a Future Fellowship (No. FT140100255). M.H. acknowledges support from an NSERC Discovery Grant, from the Australian Astronomical Observatory Distinguished Visitor Scheme and ... Article in Journal/Newspaper sami Australian National University: ANU Digital Collections The Astrophysical Journal 873 1 52 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
galaxies: clusters: general galaxies: evolution galaxies: star formation |
spellingShingle |
galaxies: clusters: general galaxies: evolution galaxies: star formation Owers, Matthew Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, J. Brough, Sarah Bryant, Julia J. Cortese, L. Couch, Warrick Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Allan Medling, Anne The SAMI Galaxy Survey: Quenching of Star Formation in Clusters I. Transition Galaxies |
topic_facet |
galaxies: clusters: general galaxies: evolution galaxies: star formation |
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. M.S.O. acknowledges the funding support from the Australian Research Council through a Future Fellowship (No. FT140100255). M.H. acknowledges support from an NSERC Discovery Grant, from the Australian Astronomical Observatory Distinguished Visitor Scheme and ... |
format |
Article in Journal/Newspaper |
author |
Owers, Matthew Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, J. Brough, Sarah Bryant, Julia J. Cortese, L. Couch, Warrick Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Allan Medling, Anne |
author_facet |
Owers, Matthew Hudson, Michael J. Oman, Kyle A. Bland-Hawthorn, J. Brough, Sarah Bryant, Julia J. Cortese, L. Couch, Warrick Croom, Scott M. van de Sande, Jesse Federrath, Christoph Groves, Brent Allan Medling, Anne |
author_sort |
Owers, Matthew |
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 |
IOP Publishing |
url |
http://hdl.handle.net/1885/232499 https://doi.org/10.3847/1538-4357/ab0201 https://openresearch-repository.anu.edu.au/bitstream/1885/232499/3/1901.08185.pdf.jpg |
genre |
sami |
genre_facet |
sami |
op_source |
The Astrophysical Journal |
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/DP170100603 http://purl.org/au-research/grants/arc/FT180100495 http://purl.org/au-research/grants/arc/FT140101202 0004-637X http://hdl.handle.net/1885/232499 doi:10.3847/1538-4357/ab0201 https://openresearch-repository.anu.edu.au/bitstream/1885/232499/3/1901.08185.pdf.jpg |
op_rights |
© 2019 The American Astronomical Society |
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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1788065064258895872 |