期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 453, 期 1, 页码 721-738出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1690
关键词
galaxies: formation; galaxies: haloes; cosmology: theory; large-scale structure of Universe
资金
- NWO VIDI [639.042.814]
- ERC FP7 grant [278594]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grant [ST/H008519/1]
- STFC DiRAC Operations grant [ST/K003267/1]
- Durham University
- Dutch National Computing Facilities Foundation (NCF)
- Netherlands Organization for Scientific Research (NWO)
- European Research Council under the European Union's Seventh Framework Programme (FP7) / ERC [278594, GA 267291, 321334]
- UK Science and Technology Facilities Council [ST/F001166/1, ST/I000976/1]
- Rolling and Consolodating Grants
- Marie Curie Reintegration Grant [PERG06-GA-2009-256573]
- Interuniversity Attraction Poles Programme
- Belgian Science Policy Office [AP P7/08 CHARM]
- STFC [ST/L00061X/1, ST/I00162X/1, ST/H008519/1, ST/L00075X/1, ST/I004459/2, ST/K00042X/1, ST/M007006/1, ST/I000976/1, ST/I004459/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H008519/1, ST/I000976/1, ST/I00162X/1, ST/L00061X/1, ST/M007006/1, ST/K00042X/1, ST/L00075X/1] Funding Source: researchfish
We report the alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE (Evolution and Assembly of GaLaxies and their Environments) and cosmo-OWLS(Over-Whelmingly Large Simulations) simulations. The combination of these state-of-the-art hydrodynamical cosmological simulations enables us to span four orders of magnitude in halo mass (11 <= log(10)(M-200/[h(-1)M(circle dot)]) <= 15), a wide radial range (-2.3 <= log(10)(r/[h(-1) Mpc]) <= 1.3) and redshifts 0 <= z <= 1. The shape parameters of the dark matter, stellar and hot gas distributions follow qualitatively similar trends: they become more aspherical (and triaxial) with increasing halo mass, radius, and redshift. We measure the misalignment of the baryonic components (hot gas and stars) of galaxies with their host halo as a function of halo mass, radius, redshift, and galaxy type (centrals versus satellites and early-versus late-type). Overall, galaxies align well with the local distribution of the total (mostly dark) matter. However, the stellar distributions on galactic scales exhibit a median misalignment of about 45-50 deg with respect to their host haloes. This misalignment is reduced to 25-30 deg in the most massive haloes (13 <= log(10)(M-200/[h(-1) M-circle dot]) <= 15). Half of the disc galaxies in the EAGLE simulations have a misalignment angle with respect to their host haloes larger than 40 deg. We present fitting functions and tabulated values for the probability distribution of galaxy-halo misalignment to enable a straightforward inclusion of our results into models of galaxy formations based on purely collisionless N-body simulations.
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