arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.04094astro-ph.GA
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e-星系速度色散的维里模型和各向异性

Virial models and Anisotropy of Velocity Dispersion in e-galaxies

B. P. Kondratyev, E. N. Kireeva

摘要:

张量维里方法被用来构建22个扁平椭圆星系的详细模型。这些模型与新的观测数据相结合:扩展的表面亮度分布,轮廓的等照度线平坦和扭曲,旋转曲线和速度色散轮廓。这些模型的一个关键特征是严格考虑了星系的空间形状(扁球体或三轴椭球体)对动力学的影响,以及这些系统中内部密度层的结构。对于每个星系的转动能量的比率的势能被发现。比较这个比率与观察到的,它的结论是,大多数这些系统不可能有各向同性的速度色散张量。各向异性参数限制在0.0-0.224的范围内。发现了巨E星系外区的变平和变平之间的相关性。我们的结果与其他研究人员的结果进行了比较。结果发现,对于小的快速转子,我们的值\b{eta}是在很好的协议,在ATLAS项目中获得的。然而,对于巨大的E-星系,我们的模型提供了更好的协议与观测,比轴对称的JAM模型。此外,我们的速度色散各向异性结果与Illustris计划中的高分辨率宇宙学模拟结果也令人满意地一致

英文摘要:

A tensor virial approach is used to construct detailed models of 22 flattened ellipticals. The models are combined with the new observational data: extended surface brightness distributions, the profiles of isophotes flattening and their twisting, the rotation curves and the velocity dispersion profiles. A key feature of these models is a rigorous consideration of the influence of the spatial shape of galaxies (oblate spheroid or triaxial ellipsoid) on the dynamics, as well as the structure of the internal density layers in these systems. For each galaxy the ratio of the rotational energy to the potential energy was found. Comparing this ratio with the observed it is concluded that the majority of these systems cannot have isotropic velocity dispersion tensors. The anisotropy parameter limited to the interval 0.0-0.224. A correlation was found between and flattening of the outer regions for giant E-galaxies. Our results are compared with the results of other researchers. It was found that for small fast rotators our values \b{eta} are in good agreement with those, obtained in the ATLAS project. However, for giant E-galaxies, our models provide better agreement with observations, than axisymmetric JAM models. In addition, our velocity dispersion anisotropy results are in satisfactory agreement with the results of high resolution cosmological simulations in the Illustris project

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