The SIBELIUS Project: E Pluribus Unum
| العنوان: | The SIBELIUS Project: E Pluribus Unum |
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| المؤلفون: | Till Sawala, Adrian Jenkins, Peter H. Johansson, Stuart McAlpine, Jens Jasche, Carlos S. Frenk, Guilhem Lavaux |
| المساهمون: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, Particle Physics and Astrophysics |
| المصدر: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2021, 509 (1), pp.1432-1446. ⟨10.1093/mnras/stab2684⟩ Monthly Notices of the Royal Astronomical Society, 2022, Vol.509(1), pp.1432-1446 [Peer Reviewed Journal] |
| بيانات النشر: | HAL CCSD, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Angular momentum, Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 114 Physical sciences, 01 natural sciences, dark matter, methods: numerical, Theoretical physics, 0103 physical sciences, galaxies: formation, 010303 astronomy & astrophysics, media_common, Physics, COSMIC cancer database, 010308 nuclear & particles physics, Local Group, Astronomy and Astrophysics, Observable, 115 Astronomy, Space science, Astrophysics - Astrophysics of Galaxies, Universe, Radial velocity, Specific orbital energy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Orbit (dynamics), large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | We introduce "Simulations Beyond The Local Universe" (SIBELIUS) that connect the Local Group to its cosmic environment. We show that introducing hierarchical small-scale perturbations to a density field constrained on large scales by observations provides an efficient way to explore the sample space of Local Group analogues. From more than 60 000 simulations, we identify a hierarchy of Local Group characteristics emanating from different scales: the total mass, orientation, orbital energy and the angular momentum are largely determined by modes above $\lambda$ = 1.6 comoving Mpc (cMpc) in the primordial density field. Smaller scale variations are mostly manifest as perturbations to the MW-M31 orbit, and we find that the observables commonly used to describe the Local Group -- the MW-M31 separation and radial velocity -- are transient and depend on specifying scales down to 0.2 cMpc in the primordial density field. We further find that the presence of M33/LMC analogues significantly affects the MW-M31 orbit and its sensitivity to small-scale perturbations. We construct initial conditions that lead to the formation of a Local Group whose primary observables precisely match the current observations. Comment: 14 pages, 15 figures. Submitted to MNRAS, comments welcome! |
| وصف الملف: | application/pdf |
| اللغة: | English |
| DOI: | 10.1093/mnras/stab2684⟩ |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4bd3c341811b3f01adf4e6b6751a3e4 https://hal.archives-ouvertes.fr/hal-03191135 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....b4bd3c341811b3f01adf4e6b6751a3e4 |
| قاعدة البيانات: | OpenAIRE |
| DOI: | 10.1093/mnras/stab2684⟩ |
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