用10年的Fermi-LAT数据修订了Circinus星系
Circinus Galaxy Revisted with 10 Years of Fermi-LAT Data
摘要：
圆规座星系是一个邻近的星暴/活动星系核复合系统。在这项工作中，我们重新分析了从Circinus的GeV的排放与10年的{ \it费米}-LAT通过8数据。在1-500 GeV的能量范围内，能谱可用幂律模型拟合，其光子指数为$Γ$ = $2.20\pm0.14$，其光子通量为$(5.90\pm1.04) \times 10^{-10}$ photons cm $^{-2}$ s $^{-1}$ .我们得到的0.1-500 GeV的辐射通量比以往文献报道的辐射通量低几倍，这与恒星形成星系和本星系群的经验关系式基本一致，并可能由宇宙射线与星际介质的相互作用重现。$γ$射线光度与总红外光度之比接近质子量热极限，表明Circinus可能是一个质子量热计。然而，在时间分析中发现了$γ$射线发射的变化的边缘证据，这可能指示活动星系核喷流的活动。需要更多的{ \it Fermi}-LAT数据和未来对CTA的观测，以充分揭示其$γ$射线发射的起源。
英文摘要：
Circinus galaxy is a nearby composite starburst/AGN system. In this work we re-analyze the GeV emission from Circinus with 10 years of {\it Fermi}-LAT Pass 8 data. In the energy range of 1-500 GeV, the spectrum can be well fitted by a power-law model with a photon index of $Γ$ = $2.20\pm0.14$, and its photon flux is $(5.90\pm1.04) \times 10^{-10}$ photons cm$^{-2}$ s$^{-1}$. Our 0.1-500 GeV flux is several times lower than that reported in the previous literature, which is roughly in compliance with the empirical relation for star-forming and local group galaxies and might be reproduced by the interaction between cosmic rays and the interstellar medium. The ratio between the $γ$-ray luminosity and the total infrared luminosity is near the proton calorimetric limit, indicating that Circinus may be a proton calorimeter. However, marginal evidence for variability of the $γ$-ray emission is found in the timing analysis, which may indicate the activity of AGN jet. More {\it Fermi}-LAT data and future observation of CTA are required to fully reveal the origin of its $γ$-ray emission.
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