The great Kite in the sky: A LOFAR observation of the radio source in Abell 2626

The great Kite in the sky: A LOFAR observation of the radio source in Abell 2626
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天空中的大风筝:对阿贝尔 2626 射电源的 LOFAR 观测

DOI:
10.1051/0004-6361/202039056
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发表时间:
2020
影响因子:
6.5
通讯作者:
Ignesti A
Ignesti A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ignesti A

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位于星系团阿贝尔2626中心的射电源,也被称为风筝,以其由四个对称弧组成的独特形态而闻名。以前的研究已经探讨了这个源在不同频率的性质及其与周围热等离子体的相互作用,但它的起源之谜仍然没有解决AimsWe使用一个新的低频阵列射线(LOFAR)观测从LOFAR两米巡天在144 MHz调查kite.Methodswe提出了一个详细的分析新的无线电数据,我们结合了无线电和X射线观测的档案。我们制作了一个新的,分辨率为7″的源的光谱指数图,我们研究了无线电和X射线发射的空间相关性,以调查热等离子体和非热等离子体之间的相互作用。ResultsThe新的LOFAR数据改变了我们对风筝的看法,因为我们发现了两个陡峭的光谱(α<− 1. 5)羽状发射连接到弧。 光谱分析显示,第一次,光谱的空间趋势沿着弧弯曲的同步辐射光谱和空间相关性的证据与X射线表面亮度。根据我们的研究结果,我们提出,风筝最初是一个X形的射电星系的化石射电等离子体,结束后的中央活动星系核的活动,已被压缩的热等离子体包围的星系的运动的结果。化石等离子体的压缩和平流之间的相互作用,以及中央星系核活动的重新开始,可能增强了产生风筝弧的化石等离子体的无线电发射。我们还提出了第一个,低频观测的水母星系在同一领域,在其中我们检测到扩展,低频发射没有对应的较高频率。
ContextThe radio source at the center of the galaxy cluster Abell 2626, also known as the Kite, stands out for its unique morphology composed of four symmetric arcs. Previous studies have probed the properties of this source at different frequencies and its interplay with the surrounding thermal plasma, but the puzzle of its origin is still unsolved.AimsWe use a new LOw-Frequency ARray (LOFAR) observation from the LOFAR Two-meter Sky Survey at 144 MHz to investigate the origin of the Kite.MethodsWe present a detailed analysis of the new radio data, which we combined with archival radio and X-ray observations. We produced a new, resolved spectral index map of the source with a resolution of 7″ and we studied the spatial correlation of radio and X-ray emission to investigate the interplay between thermal and nonthermal plasma.ResultsThe new LOFAR data changed our view of the Kite because we discovered two steep-spectrum (α<  −1.5) plumes of emission connected to the arcs. The spectral analysis shows, for the first time, a spatial trend of the spectrum along the arcs with evidence of curved synchrotron spectra and a spatial correlation with the X-ray surface brightness. On the basis of our results, we propose that the Kite was originally an X-shaped radio galaxy whose fossil radio plasma, after the end of the activity of the central active galactic nucleus, has been compressed as a consequence of motions of the thermal plasma encompassing the galaxy. The interplay between the compression and advection of the fossil plasma, with the restarting of the nuclear activity of the central galaxy, could have enhanced the radio emission of the fossil plasma producing the arcs of the Kite. We also present the first, low-frequency observation of a jellyfish galaxy in the same field, in which we detect extended, low-frequency emission without a counterpart at higher frequencies.
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