The influence of baryons on the mass distribution of dark matter halos

	The influence of baryons on the mass distribution of dark matter halos
	Lin, W. P.; Jing, Y. P.; Mao, S.; Gao, L.; McCarthy, I. G.
刊名	ASTROPHYSICAL JOURNAL
	2006-11-10
卷号	651 期号:2 页码:636-642
关键词	cosmology : theory dark matter galaxies : halos methods : numerical
英文摘要	Using a set of high-resolution N-body/SPH cosmological simulations with identical initial conditions but run with different numerical setups, we investigate the influence of baryonic matter on the mass distribution of dark halos when radiative cooling is not included. We compare the concentration parameters of about 400 massive halos with virial mass from 10(13) to 7.1 x 10(14) h(-1) M-circle dot. We find that the concentration parameters for the total mass and dark matter distributions in nonradiative simulations are on average larger by similar to 3% and 10% than those in a pure dark matter simulation. Our results indicate that the total mass density profile is little affected by a hot gas component in the simulations. After carefully excluding the effects of resolutions and spurious two-body heating between dark matter (DM) and gas particles, we conclude that the increase of the DM concentration parameters is due to interactions between baryons and DM. We demonstrate this with the aid of idealized simulations of two-body mergers. The results of individual halos simulated with different mass resolutions show that in the gas profiles of densities, temperature and entropy are subjects of mass resolution of SPH particles. In particular, we find that in the inner parts of halos, as the SPH resolution increases the gas density becomes higher but both the entropy and temperature decrease.
学科主题	星系和宇宙学研究中心
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY-PROPERTIES ; GALAXY CLUSTERS ; COSMOLOGICAL SIMULATIONS ; RELAXED CLUSTER ; GIANT ARCS ; PROFILE ; CONTRACTION ; MODEL ; CODE ; GAS
收录类别	SCI
语种	英语
WOS记录号	WOS:000241825000003
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/11845]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Shanghai Astron Observ, SHAO, Joint Inst Galaxy & Cosmol JOINGC, Shanghai 200030, Peoples R China 2.Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England 3.Inst Computat Cosmol, Dept Phys, Durham DH1 3LE, England
推荐引用方式 GB/T 7714	Lin, W. P.,Jing, Y. P.,Mao, S.,et al. The influence of baryons on the mass distribution of dark matter halos[J]. ASTROPHYSICAL JOURNAL,2006,651(2):636-642.
APA	Lin, W. P.,Jing, Y. P.,Mao, S.,Gao, L.,&McCarthy, I. G..(2006).The influence of baryons on the mass distribution of dark matter halos.ASTROPHYSICAL JOURNAL,651(2),636-642.
MLA	Lin, W. P.,et al."The influence of baryons on the mass distribution of dark matter halos".ASTROPHYSICAL JOURNAL 651.2(2006):636-642.