RECONSTRUCTING THE INITIAL DENSITY FIELD OF THE LOCAL UNIVERSE: METHODS AND TESTS WITH MOCK CATALOGS

CORC > 上海天文台 > 中国科学院上海天文台 > 空间导航与定位技术重点实验室

	RECONSTRUCTING THE INITIAL DENSITY FIELD OF THE LOCAL UNIVERSE: METHODS AND TESTS WITH MOCK CATALOGS
	Wang, Huiyuan 1,2; Mo, H. J.2; Yang, Xiaohu 3,4; van den Bosch, Frank C.5
刊名	ASTROPHYSICAL JOURNAL
	2013-07-20
卷号	772 期号:1
关键词	dark matter galaxies: halos large-scale structure of universe methods: statistical
英文摘要	Our research objective in this paper is to reconstruct an initial linear density field, which follows the multivariate Gaussian distribution with variances given by the linear power spectrum of the current cold dark matter model and evolves through gravitational instabilities to the present-day density field in the local universe. For this purpose, we develop a Hamiltonian Markov Chain Monte Carlo method to obtain the linear density field from a posterior probability function that consists of two components: a prior of a Gaussian density field with a given linear spectrum and a likelihood term that is given by the current density field. The present-day density field can be reconstructed from galaxy groups using the method developed in Wang et al. Using a realistic mock Sloan Digital Sky Survey DR7, obtained by populating dark matter halos in the Millennium simulation (MS) with galaxies, we show that our method can effectively and accurately recover both the amplitudes and phases of the initial, linear density field. To examine the accuracy of our method, we use N-body simulations to evolve these reconstructed initial conditions to the present day. The resimulated density field thus obtained accurately matches the original density field of the MS in the density range 0.3 less than or similar to rho/(rho) over bar less than or similar to 20 without any significant bias. In particular, the Fourier phases of the resimulated density fields are tightly correlated with those of the original simulation down to a scale corresponding to a wavenumber of similar to 1 h Mpc(-1), much smaller than the translinear scale, which corresponds to a wavenumber of similar to 0.15 h Mpc(-1).
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DARK-MATTER HALOES ; LARGE-SCALE STRUCTURE ; DIGITAL SKY SURVEY ; GALAXY FORMATION ; DWARF GALAXIES ; CONSTRAINED SIMULATIONS ; COSMIC VELOCITY ; COOLING FLOWS ; MASS ; LUMINOSITY
收录类别	SCI
语种	英语
WOS记录号	WOS:000321673700063
公开日期	2014-09-22
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15147]
专题	上海天文台_空间导航与定位技术重点实验室
作者单位	1.Univ Sci & Technol China, Dept Astron, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 2.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 3.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 4.Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China 5.Yale Univ, Dept Astron, New Haven, CT 06520 USA
推荐引用方式 GB/T 7714	Wang, Huiyuan,Mo, H. J.,Yang, Xiaohu,et al. RECONSTRUCTING THE INITIAL DENSITY FIELD OF THE LOCAL UNIVERSE: METHODS AND TESTS WITH MOCK CATALOGS[J]. ASTROPHYSICAL JOURNAL,2013,772(1).
APA	Wang, Huiyuan,Mo, H. J.,Yang, Xiaohu,&van den Bosch, Frank C..(2013).RECONSTRUCTING THE INITIAL DENSITY FIELD OF THE LOCAL UNIVERSE: METHODS AND TESTS WITH MOCK CATALOGS.ASTROPHYSICAL JOURNAL,772(1).
MLA	Wang, Huiyuan,et al."RECONSTRUCTING THE INITIAL DENSITY FIELD OF THE LOCAL UNIVERSE: METHODS AND TESTS WITH MOCK CATALOGS".ASTROPHYSICAL JOURNAL 772.1(2013).