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- Sawala, Till (author)
The SIBELIUS Project : E Pluribus Unum
- Article/chapterEnglish2022
Publisher, publication year, extent ...
- 2021-11-12
- Oxford University Press (OUP),2022
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-201929
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-201929URI
- https://doi.org/10.1093/mnras/stab2684DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- 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 and genre
- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
- methods: numerical
- galaxies: formation
- Local Group
- dark matter
- large-scale structure of Universe
Added entries (persons, corporate bodies, meetings, titles ...)
- McAlpine, Stuart (author)
- Jasche, JensStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)jeja4711 (author)
- Lavaux, Guilhem (author)
- Jenkins, Adrian (author)
- Johansson, Peter H. (author)
- Frenk, Carlos S. (author)
- Stockholms universitetFysikum (creator_code:org_t)
Related titles
- In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)509:1, s. 1432-14460035-87111365-2966
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