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arXiv 1412.8596astro-ph.GA
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利用有尾射电星系的形态和磁场作为环境探测器

Using the morphology and magnetic fields of tailed radio galaxies as environmental probes

M. Johnston-Hollitt, S. Dehghan, L. Pratley

摘要:

弯尾(BT)射电源长期以来一直被认为可以追踪宇宙中的密度,直到z ~ 1,越来越多的证据表明这种关联一直持续到红移为2。BT星系中喷流的形态主要是它们所居住环境的函数,因此BT提供了有关其局部条件的宝贵线索。因此,BT星系的样本不仅可以被用作大尺度结构的路标,但也是有价值的,获得一个统计测量的集群内介质的属性,包括集群吸积冲击和风的存在,并作为历史风速计,保存其周围的动力学历史,在他们的喷流。我们讨论了使用BT来揭示大尺度结构,并提供了一个例子,其中BT被用来解锁其主机集群的动态历史。除了用作密度和动力学指标外,BT还是探测其环境中磁场的有用探针,其尺度是其他方法无法达到的。在这里,我们讨论了一种新的方式,其中一个特定的子类BTs,所谓的“螺旋”星系可能会进一步阐明在其附近的磁场的相干长度。考虑到BT估计在下一代调查中占很大的人口,我们认为以这种方式使用喷气机可以为z = 2的集群和群体提供独特的环境信息来源。

英文摘要:

Bent-tailed (BT) radio sources have long been known to trace over densities in the Universe up to z ~ 1 and there is increasing evidence this association persists out to redshifts of 2. The morphology of the jets in BT galaxies is primarily a function of the environment that they have resided in and so BTs provide invaluable clues as to their local conditions. Thus, not only can samples of BT galaxies be used as signposts of large-scale structure, but are also valuable for obtaining a statistical measurement of properties of the intra-cluster medium including the presence of cluster accretion shocks & winds, and as historical anemometers, preserving the dynamical history of their surroundings in their jets. We discuss the use of BTs to unveil large-scale structure and provide an example in which a BT was used to unlock the dynamical history of its host cluster. In addition to their use as density and dynamical indicators, BTs are useful probes of the magnetic field on their environment on scales which are inaccessible to other methods. Here we discuss a novel way in which a particular sub-class of BTs, the so-called `corkscrew' galaxies might further elucidate the coherence lengths of the magnetic fields in their vicinity. Given that BTs are estimated to make up a large population in next generation surveys we posit that the use of jets in this way could provide a unique source of environmental information for clusters and groups up to z = 2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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