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arXiv 1208.2845astro-ph.COastro-ph.GA
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室女室女星系团螺旋的磁场:论文II

The magnetic fields of large Virgo cluster spirals: Paper II

M. Wezgowiec, M. Urbanik, R. Beck, K. T. Chyzy, M. Soida

摘要:

室女星系团为研究星系与星系团环境的相互作用提供了极好的条件。可以详细研究高速潮汐相互作用和撞击压力剥离的影响。我们扩展我们的系统搜索可能的异常的磁场结构的室女星系团螺旋,以表征各种影响,并将它们归因于不同的干扰剂。六个大角度室女星系团螺旋星系(NGC 4192、NGC 4302、NGC 4303、NGC 4321、NGC 4388和NGC 4535)是使用位于Effelsberg的100米射电望远镜在4.85 GHz和8.35 GHz进行的灵敏总功率和偏振研究的目标(除了仅在4.85GHz下观察到的NGC 4388和仅在8.35GHz下观察到的NGC 4535)。在所有星系中都发现了不同程度的磁场结构畸变。三个星系(NGC 4302、NGC 4303和NGC 4321)显示出可能存在潮汐相互作用的迹象,而NGC 4388和NGC 4535很可能分别经历了强烈的冲压压力和剪切效应,表现为偏振强度分布的扭曲和不对称。正如我们以前的研究一样,即使是强烈扰动的星系也会密切遵循无线电-远红外相关。在NGC 4303和NGC 4321中,我们观察到对称的磁场螺旋图案,在NGC 4535中观察到不对称图案。磁场使我们能够追踪甚至是其他观测难以探测到的弱相互作用。我们的研究结果表明,星系的扭曲程度不是一个简单的函数的距离集群中心,但也反映了它的相互作用的历史。星系的速度矢量和旋转矢量之间的夹角可能是描述星系磁场扭曲程度的一般参数。

英文摘要:

The Virgo cluster of galaxies provides excellent conditions for studying interactions of galaxies with the cluster environment. Both the high-velocity tidal interactions and effects of ram pressure stripping by the intracluster gas can be investigated in detail. We extend our systematic search for possible anomalies in the magnetic field structures of Virgo cluster spirals in order to characterize a variety of effects and attribute them to different disturbing agents. Six angularly large Virgo cluster spiral galaxies (NGC4192, NGC4302, NGC4303, NGC4321, NGC4388, and NGC4535) were targets of a sensitive total power and polarization study using the 100-m radio telescope in Effelsberg at 4.85GHz and 8.35GHz (except for NGC4388 observed only at 4.85GHz, and NGC4535 observed only at 8.35GHz). Magnetic field structures distorted to various extent are found in all galaxies. Three galaxies (NGC4302, NGC4303, and NGC4321) show some signs of possible tidal interactions, while NGC4388 and NGC4535 have very likely experienced strong ram-pressure and shearing effects, respectively, visible as distortions and asymmetries of polarized intensity distributions. As in our previous study, even strongly perturbed galaxies closely follow the radio-far-infrared correlation. In NGC4303 and NGC4321, we observe symmetric spiral patterns of the magnetic field and in NGC4535 an asymmetric pattern. Magnetic fields allow us to trace even weak interactions that are difficult to detect with other observations. Our results show that the degree of distortions of a galaxy is not a simple function of the distance to the cluster center but reflects also the history of its interactions. The angle between the velocity vector and the rotation vector of a galaxy may be a general parameter that describes the level of distortions of galactic magnetic fields.

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