论文标题
从超新星残留srgej0023+3625 = g116.6-26.1的Lofar检测微弱无线电发射
LOFAR detection of faint radio emission from the supernova remnant SRGeJ0023+3625=G116.6-26.1: probing the Milky Way synchrotron halo
论文作者
论文摘要
最近在\ textit {srg}/orosita all-sky All-Sky X射线调查中发现了超新星候选SRGE 〜J0023+3625 = G116.6-26.1。这个大型（$ \ sim 4 $ deg的直径）SNR候选人在其他乐队中缺乏重要的对手。在这里，我们报告了Lofar两米Sky Sumper（Lotts-DR2）中G116.6-26.1的无线电发射的检测。无线电图像显示了类似壳的结构与SNR的X射线边界一致。该SNR的无线电发射的测量表面亮度非常低。将观察到的表面亮度外推到1〜GHz的位置，将G116.6-26.1远低于$σ-D $图中的其他物体。我们认为，检测到的无线电通量可能与Van der Laan绝热压缩模型中预期的最低水平一致，但前提是Lofar频段中光晕气的体积发射率为$ \ sim 10^{ - 42} \，{\ rm Wm wm^{ - 3} hz^{ - 3} hz^{ - 1} hz^{ - 1}如果为true，则可以将此SNR视为银河系中进化的SNR的典型示例。在X射线和无线电带中，此类SNR可以用作构成银河系光环的热和非热成分的探针。
A supernova remnant (SNR) candidate SRGe~J0023+3625 = G116.6-26.1 was recently discovered in the \textit{SRG}/eROSITA all-sky X-ray survey. This large ($\sim 4$ deg in diameter) SNR candidate lacks prominent counterparts in other bands. Here we report detection of radio emission from G116.6-26.1 in the LOFAR Two-metre Sky Survey (LoTTS-DR2). Radio images show a shell-like structure coincident with the X-ray boundary of the SNR. The measured surface brightness of radio emission from this SNR is very low. Extrapolation of the observed surface brightness to 1~GHz places G116.6-26.1 well below other objects in the $Σ-D$ diagram. We argue that the detected radio flux might be consistent with the minimal level expected in the van der Laan adiabatic compression model, provided that the volume emissivity of the halo gas in the LOFAR band is $\sim 10^{-42}\,{\rm Wm^{-3}Hz^{-1} sr^{-1}}$. If true, this SNR can be considered as a prototypical example of an evolved SNR in the Milky Way halo. In the X-ray and radio bands, such SNRs can be used as probes of thermal and non-thermal components constituting the Milky Way halo.
