Journal article
The SAMI Galaxy Survey: the link between [α/Fe] and kinematic morphology
- Abstract:
- We explore a sample of 1492 galaxies with measurements of the mean stellar population properties and the spin parameter proxy, λRe, drawn from the SAMI Galaxy Survey. We fit a global [α/Fe]–σ relation, finding that [α/Fe]=(0.395±0.010)log10(σ)−(0.627±0.002). We observe an anti-correlation between the residuals Δ[α/Fe] and the inclination-corrected λeoRe, which can be expressed as Δ[α/Fe]=(−0.057±0.008)λeoRe+(0.020±0.003). The anti-correlation appears to be driven by star-forming galaxies, with a gradient of Δ[α/Fe]∼(−0.121±0.015)λeoRe, although a weak relationship persists for the subsample of galaxies for which star formation has been quenched. We take this to be confirmation that disc-dominated galaxies have an extended duration of star formation. At a reference velocity dispersion of 200 km s−1, we estimate an increase in half-mass formation time from ∼0.5 Gyr to ∼1.2 Gyr from low- to high-λeoRe galaxies. Slow rotators do not appear to fit these trends. Their residual α-enhancement is indistinguishable from other galaxies with λeoRe⪅0.4, despite being both larger and more massive. This result shows that galaxies with λeoRe⪅0.4 experience a similar range of star formation histories, despite their different physical structure and angular momentum.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, 6.7MB, Terms of use)
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- Publisher copy:
- 10.1093/mnras/stac1221
Authors
- Publisher:
- Oxford University Press
- Journal:
- Monthly Notices of the Royal Astronomical Society More from this journal
- Volume:
- 513
- Issue:
- 4
- Pages:
- 5076-5087
- Publication date:
- 2022-05-03
- Acceptance date:
- 2022-04-26
- DOI:
- EISSN:
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1365-2966
- ISSN:
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0035-8711
- Language:
-
English
- Keywords:
- Pubs id:
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1263072
- Local pid:
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pubs:1263072
- Deposit date:
-
2022-07-12
Terms of use
- Copyright holder:
- Watson et al.
- Copyright date:
- 2022
- Rights statement:
- © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
- Licence:
- CC Attribution (CC BY)
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