The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching
ABSTRACT We study environmental quenching using the spatial distribution of current star formation and stellar population ages with the full SAMI Galaxy Survey. By using a star formation concentration index [C-index, defined as log10(r50, H α/r50, cont)], we separate our sample into regular galaxies...
Published in: | Monthly Notices of the Royal Astronomical Society |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Oxford University Press (OUP)
2022
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1093/mnras/stac2428 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac2428/45613784/stac2428.pdf https://academic.oup.com/mnras/article-pdf/516/3/3411/45882828/stac2428.pdf |
id |
croxfordunivpr:10.1093/mnras/stac2428 |
---|---|
record_format |
openpolar |
spelling |
croxfordunivpr:10.1093/mnras/stac2428 2024-04-28T08:37:21+00:00 The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching Wang(王迪), Di Croom, Scott M Bryant, Julia J Vaughan, Sam P Schaefer, Adam L D’Eugenio, Francesco Barsanti, Stefania Brough, Sarah Lagos, Claudia del P Medling, Anne M Oh, Sree van de Sande, Jesse Santucci, Giulia Bland-Hawthorn, Joss Goodwin, Michael Groves, Brent Lawrence, Jon Owers, Matt S Richards, Samuel University of Sydney Australian Astronomical Observatory Australian Research Council ERC Science and Technology Facilities Council Anglo-Australian Observatory National Science Foundation 2022 http://dx.doi.org/10.1093/mnras/stac2428 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac2428/45613784/stac2428.pdf https://academic.oup.com/mnras/article-pdf/516/3/3411/45882828/stac2428.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Monthly Notices of the Royal Astronomical Society volume 516, issue 3, page 3411-3430 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2022 croxfordunivpr https://doi.org/10.1093/mnras/stac2428 2024-04-09T07:55:05Z ABSTRACT We study environmental quenching using the spatial distribution of current star formation and stellar population ages with the full SAMI Galaxy Survey. By using a star formation concentration index [C-index, defined as log10(r50, H α/r50, cont)], we separate our sample into regular galaxies (C-index ≥−0.2) and galaxies with centrally concentrated star formation (SF-concentrated; C-index <−0.2). Concentrated star formation is a potential indicator of galaxies currently undergoing ‘outside-in’ quenching. Our environments cover ungrouped galaxies, low-mass groups (M200 ≤ 1012.5M⊙), high-mass groups (M200 in the range 1012.5–14 M⊙) and clusters (M200 > 1014M⊙). We find the fraction of SF-concentrated galaxies increases as halo mass increases by 9 ± 2 per cent, 8 ± 3 per cent, 19 ± 4 per cent, and 29 ± 4 per cent for ungrouped galaxies, low-mass groups, high-mass groups, and clusters, respectively. We interpret these results as evidence for ‘outside-in’ quenching in groups and clusters. To investigate the quenching time-scale in SF-concentrated galaxies, we calculate light-weighted age (AgeL) and mass-weighted age (AgeM) using full spectral fitting, as well as the Dn4000 and HδA indices. We assume that the average galaxy age radial profile before entering a group or cluster is similar to ungrouped regular galaxies. At large radius (1–2 Re), SF-concentrated galaxies in high-mass groups have older ages than ungrouped regular galaxies with an age difference of 1.83 ± 0.38 Gyr for AgeL and 1.34 ± 0.56 Gyr for AgeM. This suggests that while ‘outside-in’ quenching can be effective in groups, the process will not quickly quench the entire galaxy. In contrast, the ages at 1–2 Re of cluster SF-concentrated galaxies and ungrouped regular galaxies are consistent (difference of 0.19 ± 0.21 Gyr for AgeL, 0.40 ± 0.61 Gyr for AgeM), suggesting the quenching process must be rapid. Article in Journal/Newspaper sami Oxford University Press Monthly Notices of the Royal Astronomical Society 516 3 3411 3430 |
institution |
Open Polar |
collection |
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 Wang(王迪), Di Croom, Scott M Bryant, Julia J Vaughan, Sam P Schaefer, Adam L D’Eugenio, Francesco Barsanti, Stefania Brough, Sarah Lagos, Claudia del P Medling, Anne M Oh, Sree van de Sande, Jesse Santucci, Giulia Bland-Hawthorn, Joss Goodwin, Michael Groves, Brent Lawrence, Jon Owers, Matt S Richards, Samuel The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT We study environmental quenching using the spatial distribution of current star formation and stellar population ages with the full SAMI Galaxy Survey. By using a star formation concentration index [C-index, defined as log10(r50, H α/r50, cont)], we separate our sample into regular galaxies (C-index ≥−0.2) and galaxies with centrally concentrated star formation (SF-concentrated; C-index <−0.2). Concentrated star formation is a potential indicator of galaxies currently undergoing ‘outside-in’ quenching. Our environments cover ungrouped galaxies, low-mass groups (M200 ≤ 1012.5M⊙), high-mass groups (M200 in the range 1012.5–14 M⊙) and clusters (M200 > 1014M⊙). We find the fraction of SF-concentrated galaxies increases as halo mass increases by 9 ± 2 per cent, 8 ± 3 per cent, 19 ± 4 per cent, and 29 ± 4 per cent for ungrouped galaxies, low-mass groups, high-mass groups, and clusters, respectively. We interpret these results as evidence for ‘outside-in’ quenching in groups and clusters. To investigate the quenching time-scale in SF-concentrated galaxies, we calculate light-weighted age (AgeL) and mass-weighted age (AgeM) using full spectral fitting, as well as the Dn4000 and HδA indices. We assume that the average galaxy age radial profile before entering a group or cluster is similar to ungrouped regular galaxies. At large radius (1–2 Re), SF-concentrated galaxies in high-mass groups have older ages than ungrouped regular galaxies with an age difference of 1.83 ± 0.38 Gyr for AgeL and 1.34 ± 0.56 Gyr for AgeM. This suggests that while ‘outside-in’ quenching can be effective in groups, the process will not quickly quench the entire galaxy. In contrast, the ages at 1–2 Re of cluster SF-concentrated galaxies and ungrouped regular galaxies are consistent (difference of 0.19 ± 0.21 Gyr for AgeL, 0.40 ± 0.61 Gyr for AgeM), suggesting the quenching process must be rapid. |
author2 |
University of Sydney Australian Astronomical Observatory Australian Research Council ERC Science and Technology Facilities Council Anglo-Australian Observatory National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Wang(王迪), Di Croom, Scott M Bryant, Julia J Vaughan, Sam P Schaefer, Adam L D’Eugenio, Francesco Barsanti, Stefania Brough, Sarah Lagos, Claudia del P Medling, Anne M Oh, Sree van de Sande, Jesse Santucci, Giulia Bland-Hawthorn, Joss Goodwin, Michael Groves, Brent Lawrence, Jon Owers, Matt S Richards, Samuel |
author_facet |
Wang(王迪), Di Croom, Scott M Bryant, Julia J Vaughan, Sam P Schaefer, Adam L D’Eugenio, Francesco Barsanti, Stefania Brough, Sarah Lagos, Claudia del P Medling, Anne M Oh, Sree van de Sande, Jesse Santucci, Giulia Bland-Hawthorn, Joss Goodwin, Michael Groves, Brent Lawrence, Jon Owers, Matt S Richards, Samuel |
author_sort |
Wang(王迪), Di |
title |
The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
title_short |
The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
title_full |
The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
title_fullStr |
The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
title_full_unstemmed |
The SAMI Galaxy Survey: Using concentrated star formation and stellar population ages to understand environmental quenching |
title_sort |
sami galaxy survey: using concentrated star formation and stellar population ages to understand environmental quenching |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/mnras/stac2428 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac2428/45613784/stac2428.pdf https://academic.oup.com/mnras/article-pdf/516/3/3411/45882828/stac2428.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 516, issue 3, page 3411-3430 ISSN 0035-8711 1365-2966 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/mnras/stac2428 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
516 |
container_issue |
3 |
container_start_page |
3411 |
op_container_end_page |
3430 |
_version_ |
1797568800381468672 |