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A comparative analy...
A comparative analysis of the chemical compositions of Gaia-Enceladus/Sausage and Milky Way satellites using APOGEE
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- Fernandes, Laura (author)
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK
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- Mason, Andrew C (author)
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK
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- Horta, Danny (author)
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK
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- Schiavon, Ricardo P (author)
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK
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- Hayes, Christian (author)
- NRC Herzberg Astronomy and Astrophysics , 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada,National Research Council of Canada
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- Hasselquist, Sten (author)
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD 21218, USA
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- Feuillet, Diane (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Beaton, Rachael L (author)
- Department of Astrophysical Sciences , 4 Ivy Lane, Princeton University, Princeton, NJ 08544, USA;The Observatories of the Carnegie Institution for Science , 813 Santa Barbara St, Pasadena, CA 91101, USA
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- Jönsson, Henrik (author)
- Malmö University,Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
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- Kisku, Shobhit (author)
- Astrophysics Research Institute, Liverpool John Moores University , 146 Brownlow Hill, Liverpool L3 5RF, UK
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- Lacerna, Ivan (author)
- Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama , Copayapu 485, Copiapó, Chile;Millennium Institute of Astrophysics , Nuncio Monsenor Sotero Sanz 100, Of. 104, Providencia, Santiago, Chile,University of Atacama
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- Lian, Jianhui (author)
- Department of Physics and Astronomy, University of Utah , 115 S. 1400 E., Salt Lake City, UT 84112, USA
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- Minniti, Dante (author)
- Departamento de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andres Bello , Fernández Concha 700, Las Condes, Santiago, Chile;Vatican Observatory , Vatican City State, I-00120 Castello, Italy,Andrés Bello National University
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- Villanova, Sandro (author)
- Departamento de Astronomía, Universidad de Concepción , Casilla 160-C, Concepción, Chile,University of Concepción
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- Mason, Clinton C. (author)
- Liverpool John Moores University
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(creator_code:org_t)
- 2022-12-09
- 2023
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 519:3, s. 3611-3622
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: dwarf
- galaxies: Local Group
- galaxies: abundances
- galaxies: Magellanic Clouds
- galaxies: abundances
- galaxies: dwarf
- galaxies: Local Group
- galaxies: Magellanic Clouds
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Fernandes, Laura
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Mason, Andrew C
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Horta, Danny
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Schiavon, Ricard ...
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Hayes, Christian
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Hasselquist, Ste ...
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show more...
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Feuillet, Diane
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Beaton, Rachael ...
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Jönsson, Henrik
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Kisku, Shobhit
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Lacerna, Ivan
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Lian, Jianhui
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Minniti, Dante
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Villanova, Sandr ...
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Mason, Clinton C ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Monthly notices ...
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Malmö University
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Lund University