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 |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://researchers.mq.edu.au/en/publications/d8f1384c-ca20-47fb-9f6f-b3cc82139120 https://doi.org/10.3847/1538-4357/ab0201 http://www.scopus.com/inward/record.url?scp=85063584012&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/CE170100013 |
id |
ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/d8f1384c-ca20-47fb-9f6f-b3cc82139120 |
---|---|
record_format |
openpolar |
spelling |
ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/d8f1384c-ca20-47fb-9f6f-b3cc82139120 2024-06-23T07:56:32+00:00 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. Sande, Jesse van de 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. 2019-03-01 https://researchers.mq.edu.au/en/publications/d8f1384c-ca20-47fb-9f6f-b3cc82139120 https://doi.org/10.3847/1538-4357/ab0201 http://www.scopus.com/inward/record.url?scp=85063584012&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/CE170100013 eng eng info:eu-repo/semantics/openAccess Owers , M S , Hudson , M J , Oman , K A , Bland-Hawthorn , J , Brough , S , Bryant , J J , Cortese , L , Couch , W J , Croom , S M , Sande , J V D , Federrath , C , Groves , B , Hopkins , A M , Lawrence , J S , Lorente , N P F , McDermid , R M , Medling , A M , Richards , S N , Scott , N , Taranu , D S , Welker , C & Yi , S K 2019 , ' The SAMI Galaxy Survey : quenching of star formation in clusters I. transition galaxies ' , Astrophysical Journal , vol. 873 , no. 1 , 52 , pp. 1-36 . https://doi.org/10.3847/1538-4357/ab0201 galaxies: clusters: general galaxies: evolution galaxies: star formation article 2019 ftmacquarieunicr https://doi.org/10.3847/1538-4357/ab0201 2024-06-05T23:47:49Z 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 ∼2% (25/1220) of galaxies with stellar mass log(MM)>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 0.6R200 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 ∼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 Macquarie University Research Portal The Astrophysical Journal 873 1 52 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
galaxies: clusters: general galaxies: evolution galaxies: star formation |
spellingShingle |
galaxies: clusters: general galaxies: evolution galaxies: star formation 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. Sande, Jesse van de 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 |
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 ∼2% (25/1220) of galaxies with stellar mass log(MM)>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 0.6R200 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 ∼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. |
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. Sande, Jesse van de 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_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. Sande, Jesse van de 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 |
publishDate |
2019 |
url |
https://researchers.mq.edu.au/en/publications/d8f1384c-ca20-47fb-9f6f-b3cc82139120 https://doi.org/10.3847/1538-4357/ab0201 http://www.scopus.com/inward/record.url?scp=85063584012&partnerID=8YFLogxK http://purl.org/au-research/grants/arc/FT140100255 http://purl.org/au-research/grants/arc/CE170100013 |
genre |
sami |
genre_facet |
sami |
op_source |
Owers , M S , Hudson , M J , Oman , K A , Bland-Hawthorn , J , Brough , S , Bryant , J J , Cortese , L , Couch , W J , Croom , S M , Sande , J V D , Federrath , C , Groves , B , Hopkins , A M , Lawrence , J S , Lorente , N P F , McDermid , R M , Medling , A M , Richards , S N , Scott , N , Taranu , D S , Welker , C & Yi , S K 2019 , ' The SAMI Galaxy Survey : quenching of star formation in clusters I. transition galaxies ' , Astrophysical Journal , vol. 873 , no. 1 , 52 , pp. 1-36 . https://doi.org/10.3847/1538-4357/ab0201 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1802649665743618048 |