On the absence of radio haloes in clusters with double relics

On the absence of radio haloes in clusters with double relics
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关于双遗迹星团中不存在射电晕的问题

DOI:
10.1093/mnras/stx1475
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发表时间:
2017
影响因子:
4.8
通讯作者:
D. Wittman
D. Wittman
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
A. Bonafede;R. Cassano;M. Bruggen;G. Ogrean;C. Riseley;V. Cuciti;F. Gasperin;N. Golovich;R. Kale;T. Venturi;R. Weeren;D. Wik;D. Wittman

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©2018作者(S)。成对的射电遗迹被认为是在星系团合并期间形成的,当合并发生在天空平面上时最容易观察到。合并还可以通过可能与宇宙射线电子的湍流再加速有关的复杂过程产生射电光晕。然而,只有一些具有双遗迹的星系团也显示出射电光晕。在这里,我们提出了一种新的方法来推导射电晕发射的上限,并分析了档案X射线Chandra数据以及星系速度色散和透镜数据,以了解影响射电晕发射的关键参数。对于某些星系团,我们将晕功率的上限设定在P1.4 GHz-M500关联之下,证实了具有双遗迹的星系团具有不同的射电性质。计算X射线形态指标,我们发现具有双遗迹的星系团与扰动最大的星系团有关。我们还研究了不同的质量比和合并后的时间所起的作用。数据没有表明合并质量比对射电晕的存在或不存在有影响(不能拒绝星系团属于同一群的零假设)。然而,数据表明,没有射电晕可能与早期和晚期的合并有关,但样本太小,无法进行统计测试。我们的研究受到具有双遗迹的少数星系团的限制。未来对LOFAR、ASKAP、Meerkat和SKA的调查将提供更大的样本,以更好地解决这一问题。
© 2018 The Author(s). Pairs of radio relics are believed to form during cluster mergers, and are best observed when the merger occurs in the plane of the sky. Mergers can also produce radio haloes, through complex processes likely linked to turbulent re-acceleration of cosmic ray electrons. However, only some clusters with double relics also show a radio halo. Here, we present a novel method to derive upper limits on the radio halo emission, and analyse archival X-ray Chandra data, as well as galaxy velocity dispersions and lensing data, in order to understand the key parameter that switches on radio halo emission. We place upper limits on the halo power below the P1.4 GHz-M500 correlation for some clusters, confirming that clusters with double relics have different radio properties. Computing X-ray morphological indicators, we find that clusters with double relics are associated with the most disturbed clusters. We also investigate the role of different mass-ratios and time-since-merger. Data do not indicate that the merger mass-ratio has an impact on the presence or absence of radio haloes (the null hypothesis that the clusters belong to the same group cannot be rejected). However, the data suggest that the absence of radio haloes could be associated with early and late mergers, but the sample is too small to perform a statistical test. Our study is limited by the small number of clusters with double relics. Future surveys with LOFAR, ASKAP, MeerKat and SKA will provide larger samples to better address this issue.
用无线电遗迹测试宇宙射线加速:使用 MHD 和示踪剂的高分辨率研究
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影响因子: 4.8
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