论文标题
星系旋转有利于prate暗物质光环
Galaxy rotation favors prolate dark matter haloes
论文作者
论文摘要
Vera Rubin和合作者找到的扁平旋转速度$ V（r）\至{\ rm常数} $，在SPARC Galaxy-Rotation数据中非常明显地与Kepler的定律相吻合。因此，它是由拉长的暗物质分布自然复制的，其垂直于银河平面的延伸性轴。这种理论的理解是通过我们在这里报告的旋转数据的详细拟合来证实的：对于相等的暗物质剖面，细长的分布提供的$χ^2 $比纯球形的分布更小。我们还建议使用单个光环椭圆率的几何平均值，而不是其算术平均值，因为$ s = c/a \ in（0，\ infty）$对应于球形光环的$ s = 1 $，因此通常报告的平均水平偏向于Olbantentes，并且未能揭示出较大的多数级别的pro披披披披位的procal pro Callate proce salce。对于大多数数据库条目产生了$ s <1 $的几项独立编码的拟合练习，并且已理解和分类。这种可能的延展性是由于地球附近估计的暗物质密度而产生的。
The flattening rotation velocity $v(r)\to {\rm constant}$ found by Vera Rubin and collaborators and very apparent in the SPARC galaxy-rotation data coincides with Kepler's law in one less dimension. Thus, it is naturally reproduced by elongated dark matter distributions with the axis of prolateness perpendicular to the galactic plane. This theoretical understanding is borne out by the detailed fits to the rotation data that we here report: for equal dark matter profile, elongated distributions provide smaller $χ^2$ than purely spherical ones. We also propose to use the geometric mean of the individual halo ellipticities, as opposed to their arithmetic average, because $s=c/a\in (0,\infty)$ corresponds to spherical haloes for $s=1$, so that the usually reported average is skewed towards oblateness and fails to reveal the large majority of prolate haloes. Several independently coded fitting exercises concur in yielding $s<1$ for most of the database entries and the oblate exceptions are understood and classified. This likely prolateness is of consequence for the estimated dark matter density near Earth.
