NIHAO-LG: The uniqueness of Local Group dwarf galaxies
| Autor: | Nikhil Arora, Andrea V Macciò, Stéphane Courteau, Tobias Buck, Noam I Libeskind, Jenny G Sorce, Chris B Brook, Yehuda Hoffman, Gustavo Yepes, Edoardo Carlesi, Connor Stone |
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| Přispěvatelé: | Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), UAM. Departamento de Física Teórica |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Galaxies: Formation
FOS: Physical sciences Física Astronomy and Astrophysics Formation [Galaxies] Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Evolution [Galaxies] Space and Planetary Science Dwarf [Galaxies] Methods: Numerical Astrophysics of Galaxies (astro-ph.GA) Galaxies: Evolution Local Group Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Galaxies: Dwarf [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics::Galaxy Astrophysics Numerical [Methods] |
| Zdroj: | Biblos-e Archivo. Repositorio Institucional de la UAM Consejo Superior de Investigaciones Científicas (CSIC) |
| Popis: | Recent observational and theoretical studies of the Local Group (LG) dwarf galaxies have highlighted their unique star-formation history, stellar metallicity, gas content, and kinematics. We investigate the commonality of these features by comparing constrained LG and field central dwarf halo simulations in the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project. Our simulations, performed with NIHAO-like hydrodynamics which track the evolution of the Milky Way (MW) and M31 along with ~100 dwarfs in the LG, reveal the total gas mass and stellar properties (velocity dispersion, evolution history, etc.) of present-day LG dwarfs to be similar to field systems. However, relative to field galaxies, LG dwarfs have more cold gas in their central parts and more metal-rich gas in the halo stemming from interactions with other dwarfs living in a high-density environment like the LG. Interestingly, the direct impact of massive MW/M31 analogues on the metallicity evolution of LG dwarfs is minimal; LG dwarfs accrete high-metallicity gas mostly from other dwarfs at late times. We have also tested for the impact of metal diffusion on the chemical evolution of LG dwarfs, and found that it does not affect the stellar or gaseous content of LG dwarfs. Our simulations suggest that the stellar components of LG dwarfs offer a unique and unbiased local laboratory for galaxy-formation tests and comparisons, especially against the overall dwarf population in the Universe. 16 pages, 12 figures, Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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