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arXiv 1007.1580astro-ph.CO
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室女星系团中的蓝移星系

Blueshifted galaxies in the Virgo Cluster

I. D. Karachentsev, O. G. Nasonova

摘要:

我们研究了相对于本星系群具有负径向速度的室女星系团中的65个星系的样本。指出了该样品的一些特点。所有这些天体都位于星团中半径为6°的维里带内,但它们的质心相对于星团的动力中心M87向西北偏移了1.1°。这个样本中的矮星系聚集在~10'(50 kpc)的尺度上。观测到的蓝移星系分布的不对称性可能是由于M86周围的一组星系落入星系团的主体造成的。我们提供了另一种尝试来解释这种现象,假设一个相互之间的切向速度约300公里/秒的本地集团和室女星系团,由于他们被排斥的本地宇宙学空洞。

英文摘要:

We examine a sample of 65 galaxies in the Virgo cluster with negative radial velocities relative to the Local Group. Some features of this sample are pointed out. All of these objects are positioned compactly within a virial zone of radius 6° in the cluster, but their centroid is displaced relative to the dynamic center of the cluster, M87, by 1.1° to the northwest. The dwarf galaxies in this sample are clumped on a scale of ~10' (50 kpc). The observed asymmetry in the distribution of the blueshifted galaxies may be caused by infall of a group of galaxies around M86 onto the main body of the cluster. We offer another attempt to explain this phenomenon, assuming a mutual tangential velocity of ~300 km/s between the Local Group and the Virgo cluster owing to their being repelled from the local cosmological void.

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