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NIHAO project II: halo shape, phase-space density and velocity distribution of dark matter in galaxy formation simulations
Butsky, Iryna; Maccio, Andrea V.; Dutton, Aaron A.; Wang, Liang; Obreja, Aura; Stinson, Greg S.; Penzo, Camilla; Kang, Xi; Keller, Ben W.; Wadsley, James
2016
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume462Issue:1Pages:663-680
AbstractWe use the NIHAO (Numerical Investigation of Hundred Astrophysical Objects) cosmological simulations to study the effects of galaxy formation on key properties of dark matter (DM) haloes. NIHAO consists of high-resolution smoothed particle hydrodynamics simulations that include (metal-line) cooling, star formation, and feedback from massive stars and supernovae, and cover a wide stellar and halo mass range: 10(6) less than or similar to M-*/M-circle dot less than or similar to 10(11) (10(9.5) less than or similar to M-halo/M-circle dot less than or similar to 10(12.5)). When compared to DM-only simulations, the NIHAO haloes have similar shapes at the virial radius, R-vir, but are substantially rounder inside approximate to 0.1 R-vir. In NIHAO simulations, c/a increases with halo mass and integrated star formation efficiency, reaching similar to 0.8 at the Milky Way mass (compared to 0.5 in DM-only), providing a plausible solution to the long-standing conflict between observations and DM-only simulations. The radial profile of the phase-space Q parameter (rho/sigma(3)) is best fit with a single power law in DM-only simulations, but shows a flattening within approximate to 0.1 R-vir for NIHAO for total masses M > 10(11) M-circle dot. Finally, the global velocity distribution of DM is similar in both DM-only and NIHAO simulations, but in the solar neighbourhood, NIHAO galaxies deviate substantially from Maxwellian. The distribution is more symmetric, roughly Gaussian, with a peak that shifts to higher velocities for Milky Way mass haloes. We provide the distribution parameters which can be used for predictions for direct DM detection experiments. Our results underline the ability of the galaxy formation processes to modify the properties of DM haloes.
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16883
Collection星系宇宙学和暗能量研究团组
Recommended Citation
GB/T 7714
Butsky, Iryna,Maccio, Andrea V.,Dutton, Aaron A.,et al. NIHAO project II: halo shape, phase-space density and velocity distribution of dark matter in galaxy formation simulations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,462(1):663-680.
APA Butsky, Iryna.,Maccio, Andrea V..,Dutton, Aaron A..,Wang, Liang.,Obreja, Aura.,...&Wadsley, James.(2016).NIHAO project II: halo shape, phase-space density and velocity distribution of dark matter in galaxy formation simulations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,462(1),663-680.
MLA Butsky, Iryna,et al."NIHAO project II: halo shape, phase-space density and velocity distribution of dark matter in galaxy formation simulations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 462.1(2016):663-680.
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