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arXiv 0810.2223astro-ph
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Abell 2345和Abell 1240中的双遗迹:光谱指数和偏振分析

Double relics in Abell 2345 and Abell 1240: spectral index and polarization analysis

A. Bonafede, G. Giovannini, L. Feretti, F. Govoni, M. Murgia

摘要:

在双遗迹地层模型的框架下,研究了Abell 1240和Abell 2345中双遗迹的射电性质。我们提出了新的非常大的阵列观测在20和90厘米,这两个集群。我们进行了光谱指数和偏振分析,并将我们的结果与理论模型的预期进行了比较。这些新的观测结果证实了这两个星团中双遗迹的存在。在阿贝尔1240双遗迹显示无线电形态,光谱指数和偏振值与“外向合并冲击”模型。Abell 2345的遗迹之一显示了一种特殊的形态和光谱指数分布,这与目前的情况很难调和。我们提出了这个特殊遗迹的可能来源。

英文摘要:

The aim of the present work is to study the radio properties of double relics in Abell 1240 and Abell 2345 in the framework of double relic formation models. We present new Very Large Array observations at 20 and 90 cm for these two clusters. We performed spectral index and polarization analysis and compared our results with expectations from theoretical models. The presence of double relics in these two cluster is confirmed by these new observations. Double relics in Abell 1240 show radio morphology, spectral index and polarization values in agreement with "outgoing merger shocks" models. One of the relics of Abell 2345 shows a peculiar morphology and spectral index profile, that are difficult to reconcile with present scenarios. We suggest a possible origin for this peculiar relic.

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