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Profile picture Diane Feuillet

Diane Feuillet

Forskare

Profile picture Diane Feuillet

A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE

Författare

  • Laura Fernandes
  • Clinton C. Mason
  • Danny Horta
  • Ricardo P. Schiavon
  • Christian Hayes
  • Sten Hasselquist
  • Diane Feuillet
  • Rachael L. Beaton
  • Henrik Jönsson
  • Shobhit Kisku
  • Ivan Lacerna
  • Jianhui Lian
  • Dante Minniti
  • Sandro Villanova
Visa allt

Summary, in English

We use data from the 17th data release of the Apache Point Observatory Galactic Evolution Experiment (APOGEE 2) to contrast the chemical composition of the recently discovered Gaia Enceladus/Sausage system (GE/S) to those of 10 Milky Way (MW) dwarf satellite galaxies: LMC, SMC, Boötes I, Carina, Draco, Fornax, Sagittarius, Sculptor, Sextans, and Ursa Minor. Our main focus is on the distributions of the stellar populations of those systems in the [Mg/Fe]-[Fe/H] and [Mg/Mn]-[Al/Fe] planes, which are commonly employed in the literature for chemical diagnosis and where dwarf galaxies can be distinguished from in situ populations. We show that, unlike MW satellites, a GE/S sample defined purely on the basis of orbital parameters falls almost entirely within the locus of 'accreted' stellar populations in chemical space, which is likely caused by an early quenching of star formation in GE/S. Due to a more protracted history of star formation, stars in the metal-rich end of the MW satellite populations are characterized by lower [Mg/Mn] than those of their GE/S counterparts. The chemical compositions of GE/S stars are consistent with a higher early star formation rate (SFR) than MW satellites of comparable and even higher mass, suggesting that star formation in the early universe was strongly influenced by other parameters in addition to mass. We find that the direction of the metallicity gradient in the [Mg/Mn]-[Al/Fe] plane of dwarf galaxies is an indicator of the early SFR of the system.

Avdelning/ar

  • Astronomi - Har omorganiserats
  • eSSENCE: The e-Science Collaboration

Publiceringsår

2023-03-01

Språk

Engelska

Sidor

3611-3622

Publikation/Tidskrift/Serie

Monthly Notices of the Royal Astronomical Society

Volym

519

Issue

3

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • galaxies: abundances
  • galaxies: dwarf
  • galaxies: Local Group
  • galaxies: Magellanic Clouds

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0035-8711