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The SIBELIUS Project :
The SIBELIUS Project : E Pluribus Unum
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Sawala, Till (author)
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McAlpine, Stuart (author)
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- Jasche, Jens (author)
- Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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Lavaux, Guilhem (author)
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Jenkins, Adrian (author)
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Johansson, Peter H. (author)
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Frenk, Carlos S. (author)
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(creator_code:org_t)
- 2021-11-12
- 2022
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 509:1, s. 1432-1446
- Related links:
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https://doi.org/10.1...
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https://academic.oup...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- We introduce 'Simulations Beyond The Local Universe' (SIBELIUS) that connect the Local Group (LG) 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 LG analogues. From more than 60 000 simulations, we identify a hierarchy of LG 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 LG - 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 an LG whose primary observables precisely match the current observations.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- methods: numerical
- galaxies: formation
- Local Group
- dark matter
- large-scale structure of Universe
Publication and Content Type
- ref (subject category)
- art (subject category)
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