论文标题
CIZA J2242.8+5301 Northern Radio遗物的光谱极光观测：没有高频陡峭的证据
Spectro-polarimetric observations of the CIZA J2242.8+5301 northern radio relic: no evidence of high-frequency steepening
论文作者
论文摘要
在非常高的频率（> 10 GHz）下对无线电遗物的观察可以帮助理解颗粒在银河集群郊区的年龄和（重新）加速以及如何在这些环境中放大磁场。在这项工作中，我们介绍了新的单次18.6 GHz SARDINIA射电望远镜和14.25 GHz Effelsberg观察到众所周知的CIZA J2242.8+5301的北部无线电遗物。我们检测到遗物，该遗物的长度为$ \ sim $ 1.8 mpc，磁通密度等于$ \ rm s_ {14.25 \，ghz} =（9.5 \ pm3.9）\，mjy $ and $ \ rm s_ {18.6 \ ghz} =（ghz} =（7.67 \ pm0.67 \ pm0.90），和18.67 \ pm0.90 \ at。 GHz分别。从145 MHz到18.6 GHz的Relic频谱的最佳拟合模型是具有光谱指数$α= 1.12 \ PM0.03 $的幂律频谱：在这项工作中提供的新数据中未发现陡峭的证据。极化特性首次以18.6 GHz得出，揭示了平均的极化分数为$ \ sim40 \％$，并且磁场与遗物的“丝”或“床单”一致。
Observations of radio relics at very high frequency (>10 GHz) can help to understand how particles age and are (re-)accelerated in galaxy cluster outskirts and how magnetic fields are amplified in these environments. In this work, we present new single-dish 18.6 GHz Sardinia Radio Telescope and 14.25 GHz Effelsberg observations of the well known northern radio relic of CIZA J2242.8+5301. We detected the relic which shows a length of $\sim$1.8 Mpc and a flux density equal to $\rm S_{14.25\,GHz}=(9.5\pm3.9)\,mJy$ and $\rm S_{18.6\,GHz}=(7.67\pm0.90)\,mJy$ at 14.25 GHz and 18.6 GHz respectively. The resulting best-fit model of the relic spectrum from 145 MHz to 18.6 GHz is a power-law spectrum with spectral index $α=1.12\pm0.03$: no evidence of steepening has been found in the new data presented in this work. For the first time, polarisation properties have been derived at 18.6 GHz, revealing an averaged polarisation fraction of $\sim40\%$ and a magnetic field aligned with the 'filaments' or 'sheets' of the relic.
