Academic Journal
The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage
| العنوان: | The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage |
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| المؤلفون: | Vincenzo, Fiorenzo, Spitoni, Emanuele, CALURA, Francesco, Matteucci, Francesca, Silva Aguirre, Victor, MIGLIO, ANDREA, CESCUTTI, GABRIELE |
| المساهمون: | Vincenzo, Fiorenzo, Spitoni, Emanuele, Calura, Francesco, Matteucci, Francesca, Silva Aguirre, Victor, Miglio, Andrea, Cescutti, Gabriele |
| سنة النشر: | 2019 |
| المجموعة: | Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste) |
| مصطلحات موضوعية: | stars: abundances – Galaxy: abundances – Galaxy: evolution – Galaxy: formation – galaxies: individual: Enceladus – galaxies: individual: Gaia Sausage |
| الوصف: | We present the first chemical evolution model for Enceladus, alias the Gaia Sausage, to investigate the star formation history of one of the most massive satellites accreted by the Milky Way during a major merger event. Our best chemical evolution model for Enceladus nicely fits the observed stellar [α/Fe]-[Fe/H] chemical abundance trends, and reproduces the observed stellar metallicity distribution function, by assuming low star formation efficiency, fast infall time-scale, and mild outflow intensity. We predict a median age for Enceladus stars 12.33^{+0.92}_{-1.36} Gyr, and - at the time of the merger with our Galaxy (≈10 Gyr ago from Helmi et al.) - we predict for Enceladus a total stellar mass M⋆≈ 5 × 109Modot. By looking at the predictions of our best model, we discuss that merger events between the Galaxy and systems like Enceladus may have inhibited the gas accretion on to the Galaxy disc at high redshifts, heating up the gas in the halo. This scenario could explain the extended period of quenching in the star formation activity of our Galaxy about 10 Gyr ago, which is predicted by Milky Way chemical evolution models, in order to reproduce the observed bimodality in [α/Fe]-[Fe/H] between thick- and thin-disc stars. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | STAMPA |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000482695900010; volume:487; issue:1; firstpage:L47; lastpage:L52; numberofpages:6; journal:MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. LETTERS; http://hdl.handle.net/11368/3003789; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85070239189; http://hdl.handle.net/20.500.12386/30931 |
| DOI: | 10.1093/mnrasl/slz070 |
| الاتاحة: | http://hdl.handle.net/11368/3003789 https://hdl.handle.net/20.500.12386/30931 https://doi.org/10.1093/mnrasl/slz070 |
| Rights: | info:eu-repo/semantics/closedAccess |
| رقم الانضمام: | edsbas.D9A7DB4D |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/mnrasl/slz070 |
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