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

Fernandes, Laura ; Mason, Clinton C. ; Horta, Danny ; Schiavon, Ricardo P. ; Hayes, Christian ; Hasselquist, Sten ; Feuillet, Diane LU orcid ; Beaton, Rachael L. ; Jönsson, Henrik and Kisku, Shobhit , et al. (2023) In Monthly Notices of the Royal Astronomical Society 519(3). p.3611-3622
Abstract

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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
galaxies: abundances, galaxies: dwarf, galaxies: Local Group, galaxies: Magellanic Clouds
in
Monthly Notices of the Royal Astronomical Society
volume
519
issue
3
pages
12 pages
publisher
Oxford University Press
external identifiers
  • scopus:85150622693
ISSN
0035-8711
DOI
10.1093/mnras/stac3543
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
id
b98c7f41-eb4b-4a0a-95a7-086c59cc5fc6
date added to LUP
2024-01-12 15:40:27
date last changed
2024-04-13 09:06:36
@article{b98c7f41-eb4b-4a0a-95a7-086c59cc5fc6,
  abstract     = {{<p>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.</p>}},
  author       = {{Fernandes, Laura and Mason, Clinton C. and Horta, Danny and Schiavon, Ricardo P. and Hayes, Christian and Hasselquist, Sten and Feuillet, Diane and Beaton, Rachael L. and Jönsson, Henrik and Kisku, Shobhit and Lacerna, Ivan and Lian, Jianhui and Minniti, Dante and Villanova, Sandro}},
  issn         = {{0035-8711}},
  keywords     = {{galaxies: abundances; galaxies: dwarf; galaxies: Local Group; galaxies: Magellanic Clouds}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  pages        = {{3611--3622}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE}},
  url          = {{http://dx.doi.org/10.1093/mnras/stac3543}},
  doi          = {{10.1093/mnras/stac3543}},
  volume       = {{519}},
  year         = {{2023}},
}