APOGEE chemical abundance patterns of the massive milky way satellites
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Fecha
2021-12
Profesor/a Guía
Facultad/escuela
Idioma
en
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Título del volumen
Editor
IOP Publishing Ltd
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey has obtained high resolution spectra for thousands of red giant stars distributed among the massive satellite galaxies of the Milky
Way (MW): the Large and Small Magellanic Clouds (LMC/SMC), the Sagittarius Dwarf Galaxy (Sgr), Fornax
(Fnx), and the now fully disrupted Gaia Sausage/Enceladus (GSE) system. We present and analyze the APOGEE
chemical abundance patterns of each galaxy to draw robust conclusions about their star formation histories, by
quantifying the relative abundance trends of multiple elements (C, N, O, Mg, Al, Si, Ca, Fe, Ni, and Ce), as well as
by fitting chemical evolution models to the [α/Fe]–[Fe/H] abundance plane for each galaxy. Results show that the
chemical signatures of the starburst in the Magellanic Clouds (MCs) observed by Nidever et al. in the α-element
abundances extend to C+N, Al, and Ni, with the major burst in the SMC occurring some 3–4 Gyr before the burst
in the LMC. We find that Sgr and Fnx also exhibit chemical abundance patterns suggestive of secondary star
formation epochs, but these events were weaker and earlier (∼5–7 Gyr ago) than those observed in the MCs. There
is no chemical evidence of a second starburst in GSE, but this galaxy shows the strongest initial star formation as
compared to the other four galaxies. All dwarf galaxies had greater relative contributions of AGB stars to their enrichment than the MW. Comparing and contrasting these chemical patterns highlight the importance of galaxy
environment on its chemical evolution.
Notas
Indexación: Scopus.
Palabras clave
Dwarf galaxies (416), Galaxies (573), Sagittarius Dwarf Spheroidal Galaxy (1423), Large Magellanic Cloud (903), Magellanic Clouds (990), Small Magellanic Cloud (1468), Fornax Dwarf Spheroidal Galaxy (548), Galaxy Chemical Evolution (580), Chemical Enrichment (225), Chemical Abundances (224), Abundance Ratios (11), Galaxy Abundances (574)
Citación
Astrophysical Journal Volume 923, Issue 220 December 2021 Article number 172
DOI
10.3847/1538-4357/ac25f9