The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment
ABSTRACT We present a new set of index-based measurements of [α/Fe] for a sample of 2093 galaxies in the SAMI Galaxy Survey. Following earlier work, we fit a global relation between [α/Fe] and the galaxy velocity dispersion σ for red sequence galaxies, $[\alpha /\text{Fe}]=(0.378\pm 0.009)\rm {log}_...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2021
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Online Access: | http://dx.doi.org/10.1093/mnras/stab3477 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3477/41429143/stab3477.pdf https://academic.oup.com/mnras/article-pdf/510/1/1541/41988573/stab3477.pdf |
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croxfordunivpr:10.1093/mnras/stab3477 2023-05-15T18:11:40+02:00 The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment Watson, Peter J Davies, Roger L Brough, Sarah Croom, Scott M D’Eugenio, Francesco Glazebrook, Karl Groves, Brent López-Sánchez, Ángel R van de Sande, Jesse Scott, Nicholas Vaughan, Sam P Walcher, Jakob Bland-Hawthorn, Joss Bryant, Julia J Goodwin, Michael Lawrence, Jon S Lorente, Nuria P F Owers, Matt S Richards, Samuel Australian Research Council Science and Technology Facilities Council Horizon 2020 European Research Council 2021 http://dx.doi.org/10.1093/mnras/stab3477 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3477/41429143/stab3477.pdf https://academic.oup.com/mnras/article-pdf/510/1/1541/41988573/stab3477.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Monthly Notices of the Royal Astronomical Society volume 510, issue 1, page 1541-1556 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2021 croxfordunivpr https://doi.org/10.1093/mnras/stab3477 2022-06-16T13:01:53Z ABSTRACT We present a new set of index-based measurements of [α/Fe] for a sample of 2093 galaxies in the SAMI Galaxy Survey. Following earlier work, we fit a global relation between [α/Fe] and the galaxy velocity dispersion σ for red sequence galaxies, $[\alpha /\text{Fe}]=(0.378\pm 0.009)\rm {log}_{10}\left(\sigma /100\right)+(0.155\pm 0.003)$. We observe a correlation between the residuals and the local environmental surface density, whereas no such relation exists for blue cloud galaxies. In the full sample, we find that elliptical galaxies in high-density environments are α-enhanced by up to 0.057 ± 0.014 dex at velocity dispersions σ < 100 km s−1, compared with those in low-density environments. This α-enhancement is morphology-dependent, with the offset decreasing along the Hubble sequence towards spirals, which have an offset of 0.019 ± 0.014 dex. At low velocity dispersion and controlling for morphology, we estimate that star formation in high-density environments is truncated ∼1 Gyr earlier than in low-density environments. For elliptical galaxies only, we find support for a parabolic relationship between [α/Fe] and σ, with an environmental α-enhancement of at least 0.03 dex. This suggests strong contributions from both environment and mass-based quenching mechanisms. However, there is no evidence for this behaviour in later morphological types. Article in Journal/Newspaper sami Oxford University Press (via Crossref) Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) Monthly Notices of the Royal Astronomical Society 510 1 1541 1556 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics Watson, Peter J Davies, Roger L Brough, Sarah Croom, Scott M D’Eugenio, Francesco Glazebrook, Karl Groves, Brent López-Sánchez, Ángel R van de Sande, Jesse Scott, Nicholas Vaughan, Sam P Walcher, Jakob Bland-Hawthorn, Joss Bryant, Julia J Goodwin, Michael Lawrence, Jon S Lorente, Nuria P F Owers, Matt S Richards, Samuel The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT We present a new set of index-based measurements of [α/Fe] for a sample of 2093 galaxies in the SAMI Galaxy Survey. Following earlier work, we fit a global relation between [α/Fe] and the galaxy velocity dispersion σ for red sequence galaxies, $[\alpha /\text{Fe}]=(0.378\pm 0.009)\rm {log}_{10}\left(\sigma /100\right)+(0.155\pm 0.003)$. We observe a correlation between the residuals and the local environmental surface density, whereas no such relation exists for blue cloud galaxies. In the full sample, we find that elliptical galaxies in high-density environments are α-enhanced by up to 0.057 ± 0.014 dex at velocity dispersions σ < 100 km s−1, compared with those in low-density environments. This α-enhancement is morphology-dependent, with the offset decreasing along the Hubble sequence towards spirals, which have an offset of 0.019 ± 0.014 dex. At low velocity dispersion and controlling for morphology, we estimate that star formation in high-density environments is truncated ∼1 Gyr earlier than in low-density environments. For elliptical galaxies only, we find support for a parabolic relationship between [α/Fe] and σ, with an environmental α-enhancement of at least 0.03 dex. This suggests strong contributions from both environment and mass-based quenching mechanisms. However, there is no evidence for this behaviour in later morphological types. |
author2 |
Australian Research Council Science and Technology Facilities Council Horizon 2020 European Research Council |
format |
Article in Journal/Newspaper |
author |
Watson, Peter J Davies, Roger L Brough, Sarah Croom, Scott M D’Eugenio, Francesco Glazebrook, Karl Groves, Brent López-Sánchez, Ángel R van de Sande, Jesse Scott, Nicholas Vaughan, Sam P Walcher, Jakob Bland-Hawthorn, Joss Bryant, Julia J Goodwin, Michael Lawrence, Jon S Lorente, Nuria P F Owers, Matt S Richards, Samuel |
author_facet |
Watson, Peter J Davies, Roger L Brough, Sarah Croom, Scott M D’Eugenio, Francesco Glazebrook, Karl Groves, Brent López-Sánchez, Ángel R van de Sande, Jesse Scott, Nicholas Vaughan, Sam P Walcher, Jakob Bland-Hawthorn, Joss Bryant, Julia J Goodwin, Michael Lawrence, Jon S Lorente, Nuria P F Owers, Matt S Richards, Samuel |
author_sort |
Watson, Peter J |
title |
The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
title_short |
The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
title_full |
The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
title_fullStr |
The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
title_full_unstemmed |
The SAMI Galaxy Survey: trends in [α/Fe] as a function of morphology and environment |
title_sort |
sami galaxy survey: trends in [α/fe] as a function of morphology and environment |
publisher |
Oxford University Press (OUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1093/mnras/stab3477 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stab3477/41429143/stab3477.pdf https://academic.oup.com/mnras/article-pdf/510/1/1541/41988573/stab3477.pdf |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
Hubble |
geographic_facet |
Hubble |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 510, issue 1, page 1541-1556 ISSN 0035-8711 1365-2966 |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/mnras/stab3477 |
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Monthly Notices of the Royal Astronomical Society |
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510 |
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1 |
container_start_page |
1541 |
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1556 |
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