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DARK MATTER SCALING RELATIONS

机译:暗物质比例关系

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We investigate the structure of dark matter halos by means of the kinematics of a very large sample of spiral galaxies of all luminosities. The observed rotation curves show a universal profile which is the sum of an exponential thin disk term and a spherical halo term with a flat density core. We find that the Burkert profile proposed to describe the dark matter halo density distribution of dwarf galaxies also provides an excellent mass model for the dark halos around disk systems up to 100 times more massive. Moreover, we find that spiral dark matter core densities ρ_o and core radii r_o lie in the same scaling relation ρ_o = 4.5 × 10~-2(r_o/kpc)~-2/3 M_⊙o pc~-3 of dwarf galaxies with core radii up to 10 times smaller At the highest masses ρ_o decreases with r_o faster than the - 2/3 power law, implying a lack of objects with disk masses greater than 10~11 M_⊙ and central densities greater than 1.5 × 10~-2 (r_o/kpc)~-3 M_⊙ pc~-3 that can be explained by the existence of a maximum mass of about 2 × 10~12 M_⊙ for a halo hosting a spiral galaxy.
机译:我们通过各种亮度的非常大的旋涡星系样本的运动学研究暗物质光晕的结构。观察到的旋转曲线显示了一个通用轮廓,该轮廓是指数薄盘项和具有扁平密度核的球形晕项的总和。我们发现,提议用来描述矮星系暗物质晕密度分布的Burkert剖面也为磁盘系统周围的暗晕提供了一个极好的质量模型,其质量高达100倍。此外,我们发现螺旋暗物质核心密度ρ_o和核心半径r_o位于相同的比例关系ρ_o= 4.5×10〜-2(r_o / kpc)〜-2 / 3M_⊙opc〜-3核心半径减小多达10倍在最高质量下,ρ_o随r_o的下降速度快于-2/3幂定律,这意味着缺少盘质量大于10〜11M_⊙且中心密度大于1.5×10〜-的物体2(r_o / kpc)〜-3M_⊙pc〜-3可以用存在于螺旋星系的光晕的最大质量约为2×10〜12M_⊙来解释。

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