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Illuminating dark matter halo density profiles without subhaloes
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-09-19 , DOI: 10.1093/mnras/staa2851
Catherine E Fielder 1, 2 , Yao-Yuan Mao 1, 2, 3 , Andrew R Zentner 1, 2 , Jeffrey A Newman 1, 2 , Hao-Yi Wu 4 , Risa H Wechsler 5, 6
Affiliation  

Cold dark matter haloes consist of a relatively smooth dark matter component as well as a system of bound subhaloes. It is the prevailing practice to include all halo mass, including mass in subhaloes, in studies of halo density profiles. However, often in observational studies satellites are treated as having their own distinct dark matter density profiles in addition to the profile of the host. This difference makes comparisons between theoretical and observed results difficult. In this work we investigate density profiles of the smooth components of host haloes by excluding mass contained within subhaloes. We find that the density profiles of the smooth halo component (without subhaloes) differs substantially from the conventional halo density profile. Smooth profiles decline more rapidly at large radii and are not well characterised by the standard NFW profile. We also find that concentrations derived from smooth density profiles exhibit less scatter at fixed mass and a weaker mass dependence than standard concentrations. Both smooth and standard halo profiles can be described by a generalised Einasto profile, an Einasto profile with a modified central slope, with smaller residuals than either an NFW or Einasto profile. These results hold for both Milky Way-mass and cluster-mass haloes. This new characterisation of smooth halo profiles can be useful for many analyses, such as lensing and dark matter annihilation, in which the smooth and clumpy components of a halo should be accounted for separately.

中文翻译:

照亮暗物质晕密度剖面,没有亚晕

冷暗物质晕由相对平滑的暗物质成分和束缚亚晕系统组成。在晕密度剖面研究中,普遍的做法是包括所有晕质量,包括亚晕中的质量。然而,在观测研究中,卫星通常被视为除了宿主的轮廓之外还有自己独特的暗物质密度轮廓。这种差异使得理论和观察结果之间的比较变得困难。在这项工作中,我们通过排除亚晕中包含的质量来研究宿主晕的平滑成分的密度分布。我们发现平滑晕组件(无亚晕)的密度分布与传统的晕密度分布有很大不同。平滑轮廓在大半径处下降得更快,并且无法通过标准 NFW 轮廓很好地表征。我们还发现,与标准浓度相比,从平滑密度剖面得出的浓度在固定质量下的散射更少,质量依赖性更弱。平滑的和标准的光晕轮廓都可以用广义 Einasto 轮廓来描述,Einasto 轮廓具有修改的中心斜率,残差小于 NFW 或 Einasto 轮廓。这些结果适用于银河系质量和星团质量晕。平滑光晕轮廓的这种新特征可用于许多分析,例如透镜和暗物质湮灭,在这些分析中,光晕的平滑和团块成分应分别考虑。我们还发现,与标准浓度相比,从平滑密度剖面得出的浓度在固定质量下的散射更少,质量依赖性更弱。平滑的和标准的光晕轮廓都可以用广义 Einasto 轮廓来描述,Einasto 轮廓具有修改的中心斜率,残差小于 NFW 或 Einasto 轮廓。这些结果适用于银河系质量和星团质量晕。平滑光晕轮廓的这种新特征可用于许多分析,例如透镜和暗物质湮灭,在这些分析中,光晕的平滑和团块成分应分别考虑。我们还发现,与标准浓度相比,从平滑密度剖面得出的浓度在固定质量下的散射更少,质量依赖性更弱。平滑的和标准的光晕轮廓都可以用广义 Einasto 轮廓来描述,Einasto 轮廓具有修改的中心斜率,残差小于 NFW 或 Einasto 轮廓。这些结果适用于银河系质量和星团质量晕。平滑光晕轮廓的这种新特征可用于许多分析,例如透镜和暗物质湮灭,在这些分析中,光晕的平滑和团块成分应分别考虑。具有修改的中心斜率的 Einasto 剖面,残差小于 NFW 或 Einasto 剖面。这些结果适用于银河系质量和星团质量晕。平滑光晕轮廓的这种新特征可用于许多分析,例如透镜和暗物质湮灭,在这些分析中,光晕的平滑和团块成分应分别考虑。具有修改的中心斜率的 Einasto 剖面,残差小于 NFW 或 Einasto 剖面。这些结果适用于银河系质量和星团质量晕。平滑光晕轮廓的这种新特征可用于许多分析,例如透镜和暗物质湮灭,其中光晕的平滑和团块成分应分别考虑。
更新日期:2020-09-19
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