Numerical analyses of M31 dark matter profiles

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Kuantay Boshkayev, Talgar Konysbayev, Yergali Kurmanov, Orlando Luongo, Marco Muccino, Hernando Quevedo, Gulnur Zhumakhanova
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Abstract

In this paper, we reproduce the rotation curve of the Andromeda galaxy (M31) by taking into account its bulge, disk and halo components, considering the last one to contain the major part of dark matter mass. Hence, our prescription is to split the galactic bulge into two components, namely, the inner and main bulges, respectively. Both bulges are thus modeled by exponential density profiles since we underline that the widely accepted de Vaucouleurs law fails to reproduce the whole galactic bulge rotation curve. In addition, we adopt various well-known phenomenological dark matter profiles to estimate the dark matter mass in the halo region. Moreover, we apply the least-squares fitting method to determine from the rotation curve the model free parameters, namely, the characteristic (central) density, scale radius and consequently the total mass. To do so, we perform Markov chain Monte Carlo statistical analyses based on the Metropolis algorithm, maximizing our likelihoods adopting velocity and radii data points of the rotation curves. We do not fit separately the components for bulges, disk and halo, but we perform an overall fit including all the components and employing all the data points. Thus, we critically analyze our corresponding findings and, in particular, we employ the Bayesian information criterion to assess the most accredited model to describe M31 dark matter dynamics.

M31 暗物质剖面的数值分析
在本文中,我们通过考虑仙女座星系(M31)的隆起、圆盘和光环部分,重现了它的旋转曲线,并认为最后一个部分包含了暗物质质量的主要部分。因此,我们将星系隆起分成两个部分,分别是内隆起和主隆起。由于我们强调广为接受的德-沃库勒(de Vaucouleurs)定律无法再现整个银河系隆起的旋转曲线,因此两个隆起都采用指数密度曲线建模。此外,我们还采用了各种著名的暗物质现象剖面来估算光环区域的暗物质质量。此外,我们还采用最小二乘拟合方法,从旋转曲线中确定模型的自由参数,即特征(中心)密度、尺度半径以及总质量。为此,我们根据 Metropolis 算法进行了马尔科夫链蒙特卡罗统计分析,通过旋转曲线的速度和半径数据点来最大化我们的似然。我们没有分别拟合凸起、圆盘和光环的成分,而是进行了包括所有成分和采用所有数据点的整体拟合。因此,我们对相应的研究结果进行了批判性分析,特别是采用贝叶斯信息准则来评估最适合描述 M31 暗物质动力学的模型。
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来源期刊
International Journal of Modern Physics D
International Journal of Modern Physics D 地学天文-天文与天体物理
CiteScore
3.80
自引率
9.10%
发文量
181
审稿时长
4-8 weeks
期刊介绍: Gravitation, astrophysics and cosmology are exciting and rapidly advancing fields of research. This journal aims to accommodate and promote this expansion of information and ideas and it features research papers and reviews on theoretical, observational and experimental findings in these fields. Among the topics covered are general relativity, quantum gravity, gravitational experiments, quantum cosmology, observational cosmology, particle cosmology, large scale structure, high energy astrophysics, compact objects, cosmic particles and radiation.
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