Resolving the outer density profile of dark matter halo in Andromeda galaxy

24th IUPAP Conference on Computational Physics

物理学;计算机科学

Kirihara, Takanobu^1 ; Miki, Yohei^1 ; Mori, Masao^1

University of Tsukuba, Tennodai 1-1-1, Ibaraki, Tsukuba, Japan^1

关键词: CDM modeling;    Cold dark matters;    Dark matter halos;    Density profile;    Mass densities;    N-body simulation;    Structure formations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/454/1/012012/pdf
DOI  :  10.1088/1742-6596/454/1/012012

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Large-scale faint structure detected by the recent observations in the halo of the Andromeda galaxy (M31) provides an attractive window to explore the structure of outer cold dark matter (CDM) halo in M31. Using an N-body simulation of the interaction between an accreting satellite galaxy and M31, we investigate the mass-density profile of the CDM halo. We find the sufficient condition of the outer density profile of CDM halo in M31 to reproduce the Andromeda giant stream and the shells at the east and west sides of M31. The result indicates that the density profile of the outer dark matter halo of M31 is a steeper than the prediction of the theory of the structure formation based on the CDM model.