An analytic model for the axis ratio distribution of dark matter halos from the primordial Gaussian density field

	An analytic model for the axis ratio distribution of dark matter halos from the primordial Gaussian density field
	Lee, J ; Jing, YP ; Suto, Y
刊名	ASTROPHYSICAL JOURNAL
	2005-10-20
卷号	632 期号:2 页码:706-712
关键词	cosmology : theory dark matter galaxies : halos large scale structure of universe
英文摘要	We present an analytic expression for the axis ratio distribution of triaxial dark matter halos driven from physical principles. Adopting the picture of triaxial collapse based on the Zel'dovich approximation, we derive analytically both the minor-to-major and the conditional intermediate-to-major axis ratio distributions and examine how they depend on the halo mass, redshift, and cosmology. Our analytic model is tested against the simulation data given by Jing & Suto in 2002 and is found to reproduce the conditional intermediate-to-major axis ratio distribution successfully and the minor-to-major axis ratio distribution approximately. However, the trends of our analytic axis ratio distributions with mass and redshift are opposite to what is found in N-body simulations. This failure of our analytic model puts a limitation on analytic approaches based on the Lagrangian theory of the halo ellipticity. Given the overall agreement with the simulation results, our model provides a new theoretical step toward using the axis ratio distribution of dark halos as a cosmological probe. We also discuss several possibilities to improve the model.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	N-BODY SIMULATIONS ; X-RAY-CLUSTERS ; GALAXY CLUSTERS ; GRAVITATIONAL-INSTABILITY ; STATISTICS ; ALIGNMENTS ; SHAPES ; MASS ; MORPHOLOGY ; COLLAPSE
收录类别	SCI
语种	英语
WOS记录号	WOS:000232569100002
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/19388]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.Korea Inst Adv Study, Sch Phys, Seoul 20743, South Korea 2.Seoul Natl Univ, Sch Earth & Environm Sci, Astron Program, Seoul 151742, South Korea 3.Partner Grp MPA, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Tokyo, Dept Phys, Tokyo 1130033, Japan
推荐引用方式 GB/T 7714	Lee, J,Jing, YP,Suto, Y. An analytic model for the axis ratio distribution of dark matter halos from the primordial Gaussian density field[J]. ASTROPHYSICAL JOURNAL,2005,632(2):706-712.
APA	Lee, J,Jing, YP,&Suto, Y.(2005).An analytic model for the axis ratio distribution of dark matter halos from the primordial Gaussian density field.ASTROPHYSICAL JOURNAL,632(2),706-712.
MLA	Lee, J,et al."An analytic model for the axis ratio distribution of dark matter halos from the primordial Gaussian density field".ASTROPHYSICAL JOURNAL 632.2(2005):706-712.