The elemental abundance of quiescent galaxies in the LEGA-C survey: the (non-)evolution of [α/Fe] from z = 0.75 to z = 0
We measure the [α/Fe] abundances for 183 quiescent galaxies at z = 0.60−0.75 with stellar masses ranging 10.4 ≤ log10(M*/M⊙) ≤ 11.6 selected from the Large Early Galaxy Astrophysics Census survey. We estimate [α/Fe] from the ratio of the spectral indices Mgb (λ ∼ 5177 Å) and Fe4383, compared to pre...
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| Hauptverfasser: | , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
November 2023
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2023, Jahrgang: 525, Heft: 3, Pages: 4219-4230 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stad2403 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.1093/mnras/stad2403
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| Verfasserangaben: | Davide Bevacqua, Paolo Saracco, Francesco La Barbera, Giuseppe D’Ago, Roberto De Propris, Ignacio Ferreras, Anna Gallazzi, Anna Pasqual and Chiara Spiniello |
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| 245 | 1 | 4 | |a The elemental abundance of quiescent galaxies in the LEGA-C survey |b the (non-)evolution of [α/Fe] from z = 0.75 to z = 0 |c Davide Bevacqua, Paolo Saracco, Francesco La Barbera, Giuseppe D’Ago, Roberto De Propris, Ignacio Ferreras, Anna Gallazzi, Anna Pasqual and Chiara Spiniello |
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| 520 | |a We measure the [α/Fe] abundances for 183 quiescent galaxies at z = 0.60−0.75 with stellar masses ranging 10.4 ≤ log10(M*/M⊙) ≤ 11.6 selected from the Large Early Galaxy Astrophysics Census survey. We estimate [α/Fe] from the ratio of the spectral indices Mgb (λ ∼ 5177 Å) and Fe4383, compared to predictions of simple stellar population models. We find that 91 per cent of quiescents in our sample have supersolar [α/Fe], with an average value of [α/Fe] = +0.24 ± 0.01. We find no significant correlation between [α/Fe] and stellar metallicity, mass, velocity dispersion, and average formation time. Galaxies that formed the bulk of their stellar mass on time-scales shorter than 1 Gyr follow the same [α/Fe] distribution as those which formed on longer time-scales. In comparison to local early-type galaxies and to stacked spectra of quiescent galaxies at z = 0.38 and z = 0.07, we find that the average [α/Fe] has not changed between z = 0.75 and the present time. Our work shows that the vast majority of massive quiescent galaxies at z ∼ 0.7 are α-enhanced, and that no detectable evolution of the average [α/Fe] has taken place over the last ∼6.5 Gyr. | ||
| 700 | 1 | |a Saracco, Paolo |e VerfasserIn |4 aut | |
| 700 | 1 | |a La Barbera, Francesco |e VerfasserIn |4 aut | |
| 700 | 1 | |a D’Ago, Giuseppe |e VerfasserIn |4 aut | |
| 700 | 1 | |a De Propris, Roberto |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ferreras, Ignacio |e VerfasserIn |4 aut | |
| 700 | 1 | |a Gallazzi, Anna |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Spiniello, Chiara |e VerfasserIn |4 aut | |
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