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SIBELIUS-DARK : a galaxy catalogue of the local volume from a constrained realization simulation
- McAlpine, Stuart (author)
- Helly, John C. (author)
- Schaller, Matthieu (author)
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- Sawala, Till (author)
- Lavaux, Guilhem (author)
- Frenk, Carlos S. (author)
- Jenkins, Adrian (author)
- Lucey, John R. (author)
- Johansson, Peter H. (author)
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- (creator_code:org_t)
- 2022-02-08
- 2022
- English.
- In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 512:4, s. 5823-5847
- Journal article (peer-reviewed)
Abstract
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- We present SIBELIUS-DARK, a constrained realization simulation of the local volume to a distance of 200 Mpc from the Milky Way. SIBELIUS-DARK is the first study of the ‘Simulations Beyond The Local Universe’ (SIBELIUS) project, which has the goal of embedding a model Local Group-like system within the correct cosmic environment. The simulation is dark-matter-only, with the galaxy population calculated using the semi-analytic model of galaxy formation, GALFORM. We demonstrate that the large-scale structure that emerges from the SIBELIUS constrained initial conditions matches well the observational data. The inferred galaxy population of SIBELIUS-DARK also match well the observational data, both statistically for the whole volume and on an object-by-object basis for the most massive clusters. For example, the K-band number counts across the whole sky, and when divided between the northern and southern Galactic hemispheres, are well reproduced by SIBELIUS-DARK. We find that the local volume is somewhat unusual in the wider context of ΛCDM: it contains an abnormally high number of supermassive clusters, as well as an overall large-scale underdensity at the level of ≈5 per cent relative to the cosmic mean. However, whilst rare, the extent of these peculiarities does not significantly challenge the ΛCDM model. SIBELIUS-DARK is the most comprehensive constrained realization simulation of the local volume to date, and with this paper we publicly release the halo and galaxy catalogues at z = 0, which we hope will be useful to the wider astronomy community.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- methods: numerical
- galaxies: formation
- cosmology: theory
- dark matter
- large-scale structure of Universe
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- ref (subject category)
- art (subject category)
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- Frenk, Carlos S.
- Jenkins, Adrian
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