论文标题

M87球状簇的离散化学动力模型:延伸至400 kpc的运动学

A discrete chemo-dynamical model of M87's globular clusters: Kinematics extending to ~ 400 kpc

论文作者

Li, Chao, Zhu, Ling, Long, R. J., Mao, Shude, Peng, Eric W., Sarzi, Marc, van de Ven, Glenn, Zhang, Hongxin, Guo, Rui, Xue, Xiangxiang, Longobardi, Alessia, Côté, Patrick, Ferrarese, Laura, Liu, Chengze, Gwyn, Stephen, Lim, Sungsoon, Ko, Youkyung

论文摘要

我们使用离散的化学动力,轴对称牛仔裤方程建模研究了巨型椭圆星系M87(NGC 4486)的质量分布和运动学。我们的目录包括894个球状簇(GCS),这些簇扩展到$ \ sim 430 $ kpc的预计半径,带有视线速度和颜色,以及多单元光谱探索器(MUSES)集成电单位单位数据中的中央$ 2.4 $ kpc in Main Galaxy的中央$ 2.4 $ kpc。我们模型的引力潜力是将发光物质潜力与主星系的质量与光比不同,超质量黑洞和暗物质(DM)电位(DM)电位(dm)电势,带有cus或cused dm halo。具有cused或cused DM光环的最佳拟合模型没有显着差异,并且两者都是可以接受的。我们在$ \ sim $ 400 kpc中获得了$(2.16 \ pm 0.38)\ times 10^{13} m _ {\ odot} $。通过包括出色的质量比率梯度,DM分数从$ \ sim $ \ sim $ 26%(没有梯度)增加到$ \ sim $ \ sim $ 73%,$ 73%,$ 73%,$ 1 \,r_e^{\ rm maj maj} $(半光iSophote的主要轴,14.2 kpc),从$ \ sim $ 84%$ 94% $ 5 \,r_e^{\ rm maj} $(71.2 kpc)。红色GC具有$ V _ {\ rm max}/σ\ sim $ 0.4的中等旋转,并且蓝色GC的旋转较弱,$ v _ {\ rm max}/σ\ sim $ 0.1。红色GC具有切向速度分散各向异性,而蓝色GC与几乎各向同性的一致。我们的结果表明,红色GC更有可能在原位出生,而蓝色GC则更有可能被吸收。

We study the mass distribution and kinematics of the giant elliptical galaxy M87 (NGC 4486) using discrete chemo-dynamical, axisymmetric Jeans equation modelling. Our catalogue comprises 894 globular clusters (GCs) extending to a projected radius of $\sim 430$ kpc with line-of-sight velocities and colours, and Multi Unit Spectroscopic Explorer (MUSE) integral field unit data within the central $2.4$ kpc of the main galaxy. The gravitational potential for our models is a combination of a luminous matter potential with a varying mass-to-light ratio for the main galaxy, a supermassive black hole and a dark matter (DM) potential with a cusped or cored DM halo. The best-fitting models with either a cusped or a cored DM halo show no significant differences and both are acceptable. We obtain a total mass of $(2.16 \pm 0.38) \times 10^{13} M_{\odot}$ within $\sim$ 400 kpc. By including the stellar mass-to-light ratio gradient, the DM fraction increases from $\sim$ 26 percent (with no gradient) to $\sim$ 73 percent within $1\,R_e^{\rm maj}$ (major axis of half-light isophote, 14.2 kpc), and from $\sim$ 84 percent to $\sim$ 94 percent within $5\,R_e^{\rm maj}$ (71.2 kpc). Red GCs have moderate rotation with $V_{\rm max}/σ\sim$ 0.4, and blue GCs have weak rotation with $V_{\rm max}/σ\sim$ 0.1. Red GCs have tangential velocity dispersion anisotropy, while blue GCs are consistent with being nearly isotropic. Our results suggest that red GCs are more likely to be born in-situ, while blue GCs are more likely to be accreted.

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