利用uGMRT、VLA和LOFAR破译A115中非典型射电遗迹的光谱特性
Deciphering the spectral properties of the atypical radio relic in A115 using uGMRT, VLA, and LOFAR
AI总结：
本研究利用uGMRT、VLA和LOFAR的多频率射电观测，分析Abell 115星系团北部的非典型射电遗迹，证实其由离轴并合激波再加速老粒子形成，支持了离轴并合激波起源理论。
摘要：
星系团外围的百万秒差距尺度射电遗迹是引人关注的结构。经典的遗迹理论认为其是星系团外围的弧形拉长结构，但部分遗迹呈现出更复杂的结构，偏离了传统类型。Abell 115是一个星系团，其北部外围存在一个非典型射电遗迹。尽管过去几十年对该星系团开展了多波长研究，该射电遗迹的起源仍不明确。本文中，我们对该星系团开展了多频率射电研究，以推断射电遗迹形成背后的可能机制。我们使用了uGMRT的新400 MHz观测数据，以及VLA 1.5 GHz的存档观测数据和LOFAR 144 MHz的存档观测数据。我们的分析支持了此前关于遗迹起源的理论：即由离轴并合引发的激波经过遗迹区域，激波重新加速了遗迹位置处射电星系的老粒子群，从而点亮了这个跨度达2 Mpc的射电遗迹。
英文摘要：
The mega-parsec scale radio relics at the galaxy cluster periphery are intriguing structures. While textbook examples of relics posit arc-like elongated structures at the clusters' peripheries, several relics display more complex structures deviating from the conventional type. Abell 115 is a galaxy cluster, hosting an atypical radio relic at its northern periphery. Despite the multi-wavelength study of the cluster over the last decades, the origin of the radio relic is still unclear. In this paper, we present a multi-frequency radio study of the cluster to infer the possible mechanism behind the formation of the radio relic. We used new 400 MHz observations with the uGMRT, along with archival VLA 1.5 GHz observations and archival LOFAR 144 MHz observations. Our analysis supports the previous theory on the relic's origin from the passage of a shock front due to an off-axis merger, where the old population of particles from the radio galaxies at the relic location has been re-energised to illuminate the 2 Mpc radio relic.
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