@article{69a938530bf144f7bca0023d2d318034,
title = "Nihao XII: Galactic uniformity in a CDM universe",
abstract = " We use a sample of 83 high-resolution cosmological zoom-in simulations and a semi-analytic model (SAM) to study the stochasticity of galaxy formation in haloes ranging from dwarf to Milky Way masses. Our simulated galaxies reproduce the observed inefficiency of galaxy formation as expressed through the stellar, gas and baryonic Tully–Fisher relations. For H I velocities in the range (70 V 220 km s −1 ), the scatter is just 0.08 to 0.14 dex, consistent with the observed intrinsic scatter at these scales. At low velocities (20 V 70 km s −1 ), the simulated scatter is 0.2–0.25 dex, which could be tested with future observations. The scatter in the stellar mass versus dark halo velocity relation is constant for 30 V 180 km s −1 , and smaller (0.17 dex) when using the maximum circular velocity of the dark-matter-only simulation, V max DMO , compared to the virial velocity (V 200 or V 200 DMO ). The scatter in stellar mass is correlated with halo concentration, and is minimized when using a circular velocity at a fixed fraction of the virial radius 0.4R 200 or with V α = V 200 DMO (V max DMO /V 200 DMO ) α with α 0.7, consistent with constraints from halo clustering. Using the SAM we show the correlation between halo formation time and concentration is essential in order to reproduce this result. This uniformity in galaxy formation efficiency we see in our hydrodynamical simulations and an SAM proves the simplicity and self-regulating nature of galaxy formation in a cold dark matter (CDM) universe. ",
keywords = "Dark matter, Galaxies: fundamental parameters, Galaxies: haloes, Galaxies: kinematics and dynamics, Methods: numerical",
author = "Dutton, {Aaron A.} and Aura Obreja and Liang Wang and Gutcke, {Thales A.} and Tobias Buck and Udrescu, {Silviu M.} and Jonas Frings and Stinson, {Gregory S.} and Xi Kang and Macci{\`o}, {Andrea V.}",
note = "Funding Information: We thank the referee for useful comments that improved the presentation and motivated deeper analysis. This research was carried out on the High Performance Computing resources at New York University Abu Dhabi, on the THEO cluster of the Max-Planck-Institut f{\"u}r Astronomie and the HYDRA cluster at the Rechenzentrum in Garching and the Milky Way supercomputer, which is funded by the Deutsche Forschungsgemeinschaft (DFG) through Collaborative Research Center (SFB 881) {\textquoteleft}The Milky Way System{\textquoteright} (subpro-ject Z2) and hosted and co-funded by the J{\"u}lich Supercomputing Center (JSC). We greatly appreciate the contributions of all these computing allocations. TB and TAG were supported by the Sonder-forschungsbereich SFB 881 {\textquoteleft}The Milky Way System{\textquoteright} (subprojects A1 and A2) of the German Research Foundation (DFG). The analysis made use of the PYNBODY package (Pontzen et al. 2013). XK acknowledges the support from NSFC project No. 11333008 and the Strategic Priority Research Program {\textquoteleft}The Emergence of Cosmological Structures{\textquoteright} of the CAS (No.XD09010000). Funding Information: We thank the referee for useful comments that improved the presentation and motivated deeper analysis. This research was carried out on the High Performance Computing resources at New York University Abu Dhabi, on the THEO cluster of the Max-Planck-Institut f{\"u}r Astronomie and the HYDRA cluster at the Rechenzentrum in Garching and the Milky Way supercomputer, which is funded by the Deutsche Forschungsgemeinschaft (DFG) through Collaborative Research Center (SFB 881) {\textquoteleft}The Milky Way System{\textquoteright} (subproject Z2) and hosted and co-funded by the J{\"u}lich Supercomputing Center (JSC). We greatly appreciate the contributions of all these computing allocations. TB and TAG were supported by the Sonder-forschungsbereich SFB 881 {\textquoteleft}The Milky Way System{\textquoteright} (subprojects A1 and A2) of the German Research Foundation (DFG). The analysis made use of the PYNBODY package (Pontzen et al. 2013). XK acknowledges the support from NSFC project No. 11333008 and",
year = "2017",
month = jun,
day = "1",
doi = "10.1093/mnras/stx458",
language = "English (US)",
volume = "467",
pages = "4937--4950",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",
}