TY - JOUR
T1 - APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites
AU - Hasselquist, Sten
AU - Hayes, Christian R.
AU - Lian, Jianhui
AU - Weinberg, David H.
AU - Zasowski, Gail
AU - Horta, Danny
AU - Beaton, Rachael
AU - Feuillet, Diane K.
AU - Garro, Elisa R.
AU - Gallart, Carme
AU - Smith, Verne V.
AU - Holtzman, Jon A.
AU - Minniti, Dante
AU - Lacerna, Ivan
AU - Shetrone, Matthew
AU - Jönsson, Henrik
AU - Cioni, Maria Rosa L.
AU - Fillingham, Sean P.
AU - Cunha, Katia
AU - O'Connell, Robert
AU - Fernández-Trincado, José G.
AU - Munoz, Ricardo R.
AU - Schiavon, Ricardo
AU - Almeida, Andres
AU - Anguiano, Borja
AU - Beers, Timothy C.
AU - Bizyaev, Dmitry
AU - Brownstein, Joel R.
AU - Cohen, Roger E.
AU - Frinchaboy, Peter
AU - García-Hernández, D. A.
AU - Geisler, Doug
AU - Lane, Richard R.
AU - Majewski, Steven R.
AU - Nidever, David L.
AU - Nitschelm, Christian
AU - Povick, Joshua
AU - Price-Whelan, Adrian
AU - Roman-Lopes, Alexandre
AU - Rosado, Margarita
AU - Sobeck, Jennifer
AU - Stringfellow, Guy
AU - Valenzuela, Octavio
AU - Villanova, Sandro
AU - Vincenzo, Fiorenzo
N1 - Publisher Copyright:
© 2021. The American Astronomical Society. All rights reserved..
PY - 2021/12/20
Y1 - 2021/12/20
N2 - 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.
AB - 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.
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U2 - 10.3847/1538-4357/ac25f9
DO - 10.3847/1538-4357/ac25f9
M3 - Article
AN - SCOPUS:85123869087
SN - 0004-637X
VL - 923
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 172
ER -