MOND simulation suggests an origin for some peculiarities in the Local Group
| العنوان: | MOND simulation suggests an origin for some peculiarities in the Local Group |
|---|---|
| المؤلفون: | Pavel Kroupa, Michal Bílek, Ingo Thies, Benoit Famaey |
| المساهمون: | Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS) |
| المصدر: | Astron.Astrophys. Astron.Astrophys., 2018, 614, pp.A59. ⟨10.1051/0004-6361/201731939⟩ Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 614, pp.A59. ⟨10.1051/0004-6361/201731939⟩ |
| بيانات النشر: | HAL CCSD, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Milky Way, FOS: Physical sciences, Context (language use), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, local group, Gravitation, 0103 physical sciences, galaxies: interactions, galaxies: formation, Tidal tail, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, galaxies: kinematics and dynamics, Dwarf galaxy, Physics, 010308 nuclear & particles physics, Local Group, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Andromeda, Space and Planetary Science, gravitation, Astrophysics of Galaxies (astro-ph.GA), galaxies: structure, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| الوصف: | (abridged) The Milky Way (MW) and Andromeda (M31) galaxies possess rotating planes of satellites. Their formation has not been explained satisfactorily yet. It was suggested that the MW and M31 satellites are ancient tidal dwarf galaxies, which could explain their configuration. This suggestion gained support by an analytic backward calculation of the relative MW-M31 orbit in the MOND modified dynamics paradigm by Zhao et al. (2013) implying their close flyby 7-11 Gyr ago. Here we explore the Local Group history in MOND in more detail using a simplified first-ever self-consistent simulation. We note the features induced by the encounter in the simulation and identify their possible real counterparts. The simulation was set to approximately reproduce the observed MW and M31 masses, effective radii, separation, relative velocity and disk inclinations. We used the publicly available adaptive-mesh-refinement code Phantom of RAMSES. In the simulation, matter was transferred from the MW to M31 along a tidal tail. The encounter induced formation of several structures resembling the peculiarities of the Local Group. Most notably: 1) A rotating planar structure formed around M31 from the transferred material. It had a size similar to the observed satellite plane and was oriented edge-on to the simulated MW, just as the real one. 2) The same structure also resembled the tidal features observed around M31 by its size and morphology. 3) A warp in the MW developed with an amplitude and orientation similar to that observed. 4) A cloud of particles formed around the simulated MW, with the extent of the actual MW satellite system. The encounter did not end by merging in a Hubble time. The simulation thus demonstrated that MOND can possibly explain many peculiarities of the Local Group and, moreover, that non-merging galaxy encounters in MOND can produce tidal features in galaxies. Comment: 20 pages, 32 figures, 3 tables, accepted for publication in Astronomy & Astrophysics |
| اللغة: | English |
| تدمد: | 0004-6361 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a7210a24a957cd31f24c1abcc372f03 https://hal.archives-ouvertes.fr/hal-01851337 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....2a7210a24a957cd31f24c1abcc372f03 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 00046361 |
|---|