论文标题
关于处女座星系簇的结构和运动学
On structure and kinematics of the Virgo cluster of galaxies
论文作者
论文摘要
目标。这项工作考虑了处女座星系群，重点是其结构，运动学和形态学景观。我们的主要目的是估计集群的病毒质量。为此，我们提供了1537个带有径向速度的星系$ v_ {lg} <2600 $ 〜km〜s $^{ - 1} $位于$ΔSGL= 30^\ circ $和$ΔSGB= 20^\ 20^\ Circ $ M87周围的区域内。大约一半的星系具有距离估计值。 方法。我们在$（17 \ pm5）$ 〜MPC范围内选择了398个星系。根据它们的1D和2D数密度曲线及其径向速度分散体，我们对处女座簇的病毒质量进行了估计。 结果。我们确定了沿着处女座南部延伸细丝的处女座群集核心的星系中心。从集群的一维轮廓中，我们获得了$（6.3 \ pm0.9）\ times 10^{14} m_ \ odot的病毒质量估计，$通过星系的外部信息模式与质量估计密不可分。 结论。我们得出的结论是，病毒半径和零速度半径之间的处女座集群郊区不包含大量的暗物质，而不是病毒半径。
Aims. This work considers the Virgo cluster of galaxies, focusing on its structure, kinematics, and morphological landscape. Our principal aim is to estimate the virial mass of the cluster. For this purpose, we present a sample of 1537 galaxies with radial velocities $V_{LG} < 2600$~km~s$^{-1}$ situated within a region of $ΔSGL = 30^\circ$ and $ΔSGB = 20^\circ$ around M87. About half of the galaxies have distance estimates. Methods. We selected 398 galaxies with distances in a $(17\pm5)$~Mpc range. Based on their 1D and 2D number-density profiles and their radial velocity dispersions, we made an estimate for the virial mass of the Virgo cluster. Results. We identify the infall of galaxies towards the Virgo cluster core along the Virgo Southern Extension filament. From a 1D profile of the cluster, we obtain the virial mass estimate of $(6.3\pm0.9) \times 10^{14} M_\odot, $ which is in tight agreement with its mass estimate via the external infall pattern of galaxies. Conclusions. We conclude that the Virgo cluster outskirts between the virial radius and the zero-velocity radius do not contain significant amounts of dark matter beyond the virial radius.
