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Sökning: WFRF:(Mackereth J. Ted) > (2023) > The chemical charac...

The chemical characterization of halo substructure in the Milky Way based on APOGEE

Horta, Danny (författare)
University of Queensland,Astrophys Res Inst, 146 Brownlow Hill, Liverpool L35RF, England.;Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia.
Schiavon, Ricardo P. (författare)
Astrophys Res Inst, 146 Brownlow Hill, Liverpool L35RF, England.
Mackereth, J. Ted (författare)
University of Toronto,Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada.;Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S3H4, Canada.
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Weinberg, David H. (författare)
Ohio State University,Ohio State Univ, Dept Astron, Columbus, OH 43210 USA.
Hasselquist, Sten (författare)
Space Telescope Science Institute,Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.
Feuillet, Diane (författare)
Lund University,Lunds universitet,Geologiska institutionen,Naturvetenskapliga fakulteten,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Department of Geology,Faculty of Science,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden.
O’Connell, Robert W. (författare)
University of Virginia,Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Anguiano, Borja (författare)
University of Virginia,Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Allende-Prieto, Carlos (författare)
University of La Laguna (ULL),Instituto de Astrofísica de Canarias,Inst Astrofis Canarias IAC, E-38205 San Cristobal la Laguna, Tenerife, Spain.;Univ Laguna ULL, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain.
Beaton, Rachael L. (författare)
Carnegie Observatories,Observ Carnegie Inst Sci, Pasadena, CA 91101 USA.
Bizyaev, Dmitry (författare)
New Mexico State University,New Mexico State Univ, Las Cruces, NM 88003 USA.
Cunha, Katia (författare)
National Observatory Brazil,University of Arizona,Univ Arizona, Tucson, AZ 85719 USA.;Observ Nacl, Sao Cristovao, RJ, Brazil.
Geisler, Doug (författare)
University of Concepción,Universidad de La Serena,Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile.;Univ Serena, Inst Invest Multidisciplinario Ciencia & Tecnol, Ave Raul Bitran S-N, La Serena, Chile.;Univ Serena, Fac Ciencias, Dept Astron, Av Juan Cisternas 120, La Serena, Chile.
García-Hernández, D. A. (författare)
Instituto de Astrofísica de Canarias (IAC), E-38205 La Laguna, Tenerife, Spain,University of La Laguna (ULL)
Holtzman, Jon (författare)
New Mexico State University, Las Cruces, NM 88003, USA
Jönsson, Henrik (författare)
Malmö universitet,Malmö University,Institutionen för materialvetenskap och tillämpad matematik (MTM)
Lane, Richard R. (författare)
Bernardo O'Higgins University,Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago, Chile.
Majewski, Steve R. (författare)
Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
Mészáros, Szabolcs (författare)
Eötvös Loránd University,ELTE Eotv Lorand Univ, Gothard Astrophys Observ, SzentImreH st 112, H-9700 Szombathely, Hungary.;ELTE Lendulet Momentum Milky Way Res Grp, MTA, Szombathely, Hungary.
Minniti, Dante (författare)
Vatican Observatory,Andrés Bello National University,Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Fis, Av Fernandez Concha 700, Santiago, Chile.;Vatican Observ, Vatican City V-00120, Vatican City St, Vatican.
Nitschelm, Christian (författare)
University of Antofagasta,Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 60, Antofagasta 1270300, Chile.
Shetrone, Matthew (författare)
University of Texas at Austin,Univ Texas Austin, McDonald Observ, Austin, TX 79734 USA.
Smith, Verne V. (författare)
National Optical Astronomy Observatory,Natl Opt Astron Observ, Tucson, AZ 85719 USA.
Zasowski, Gail (författare)
University of Utah,Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84105 USA.
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University of Queensland Astrophys Res Inst, 146 Brownlow Hill, Liverpool L35RF, England;Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia. (creator_code:org_t)
2022-11-10
2023
Engelska 41 s.
Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 520:4, s. 5671-5711
Relaterad länk:
http://dx.doi.org/10...
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https://lup.lub.lu.s...
https://doi.org/10.1...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Galactic haloes in a Λ-CDM universe are predicted to host today a swarm of debris resulting from cannibalized dwarf galaxies. The chemodynamical information recorded in their stellar populations helps elucidate their nature, constraining the assembly history of the Galaxy. Using data from APOGEE and Gaia, we examine the chemical properties of various halo substructures, considering elements that sample various nucleosynthetic pathways. The systems studied are Heracles, Gaia-Enceladus/Sausage (GES), the Helmi stream, Sequoia, Thamnos, Aleph, LMS-1, Arjuna, I’itoi, Nyx, Icarus, and Pontus. Abundance patterns of all substructures are cross-compared in a statistically robust fashion. Our main findings include: (i) the chemical properties of most substructures studied match qualitatively those of dwarf Milky Way satellites, such as the Sagittarius dSph. Exceptions are Nyx and Aleph, which are chemically similar to disc stars, implying that these substructures were likely formed in situ; (ii) Heracles differs chemically from in situ populations such as Aurora and its inner halo counterparts in a statistically significant way. The differences suggest that the star formation rate was lower in Heracles than in the early Milky Way; (iii) the chemistry of Arjuna, LMS-1, and I’itoi is indistinguishable from that of GES, suggesting a possible common origin; (iv) all three Sequoia samples studied are qualitatively similar. However, only two of those samples present chemistry that is consistent with GES in a statistically significant fashion; (v) the abundance patterns of the Helmi stream and Thamnos are different from all other halo substructures.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

dynamics
Galaxy: abundances
Galaxy: evolution
Galaxy: formation
Galaxy: general
Galaxy: halo
Galaxy: kinematics
Galaxy: abundances

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