期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 451, 期 2, 页码 1247-1267出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1067
关键词
cosmology: theory; dark matter; large-scale structure of Universe
资金
- STFC Consolidated grant
- European Research Council [GA 267291, GA 278594, GA 238356]
- Inter-university Attraction Poles Programme
- Belgian Science Policy Office [AP P7/08 CHARM]
- Dutch National Computing Facilities Foundation (NCF)
- Netherlands Organization for Scientific Research (NWO)
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grant [ST/H008519/1]
- STFC DiRAC Operations grant [ST/K003267/1]
- Durham University
- STFC [ST/I004459/2, ST/L00061X/1, ST/I00162X/1, ST/M007006/1, ST/K00042X/1, ST/I004459/1, ST/L00075X/1, ST/H008519/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H008519/1, ST/I00162X/1, ST/L00061X/1, ST/M007006/1, ST/K00042X/1, ST/L00075X/1] Funding Source: researchfish
We investigate the internal structure and density profiles of haloes of mass 10(10)-10(14) M-circle dot in the Evolution and Assembly of Galaxies and their Environment (EAGLE) simulations. These follow the formation of galaxies in a Lambda cold dark matter Universe and include a treatment of the baryon physics thought to be relevant. The EAGLE simulations reproduce the observed present-day galaxy stellar mass function, as well as many other properties of the galaxy population as a function of time. We find significant differences between the masses of haloes in the EAGLE simulations and in simulations that follow only the dark matter component. Nevertheless, haloes are well described by the Navarro-Frenk-White density profile at radii larger than similar to 5 per cent of the virial radius but, closer to the centre, the presence of stars can produce cuspier profiles. Central enhancements in the total mass profile are most important in haloes of mass 10(12)-10(13) M-circle dot, where the stellar fraction peaks. Over the radial range where they are well resolved, the resulting galaxy rotation curves are in very good agreement with observational data for galaxies with stellar mass M-* < 5 x 10(10) M-circle dot. We present an empirical fitting function that describes the total mass profiles and show that its parameters are strongly correlated with halo mass.
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