Artículos de revistas
APOGEE chemical abundance patterns of the massive milky way satellites
Fecha
2021Registro en:
The Astrophysical Journal, 923:172 (34pp), 2021 December 20
10.3847/1538-4357/ac25f9
Autor
Hasselquist, Sten
Hayes, Christian R.
Lian, Jianhui
Weinberg, David H.
Zasowski, Gail
Horta, Danny
Beaton, Rachael
Feuillet, Diane K.
Garro, Elisa R.
Gallart, Carme
Smith, Verne V.
Holtzman, Jon A.
Minniti, Dante
Lacerna, Iván
Shetrone, Matthew
Jonsson, Henrik
Cioni, María Rosa L.
Fillingham, Sean P.
Cunha, Katia
O'Connell, Robert
Fernández Trincado, José G.
Muñoz Vidal, Ricardo Rodrigo
Schiavon, Ricardo
Almeida, Andres
Anguiano, Borja
Beers, Timothy C.
Bizyaev, Dmitry
Brownstein, Joel R.
Cohen, Roger E.
Frinchaboy, Peter
García Hernández, D. A.
Geisler, Doug
Lane, Richard R.
Majewski, Steven R.
Nidever, David L.
Nitschelm, Christian
Povick, Joshua
Price Whelan, Adrián
Román Lopes, Alexandre
Rosado, Margarita
Sobeck, Jennifer
Stringfellow, Guy
Valenzuela, Octavio
Villanova, Sandro
Vincenzo, Fiorenzo
Institución
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 [alpha/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 alpha-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 (similar to 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.