论文标题
G298.6 $ - $ 0.0的多波长研究：旧的GEV超新星残留物与分子云相互作用
Multiwavelength studies of G298.6$-$0.0: An old GeV supernova remnant interacting with molecular clouds
论文作者
论文摘要
与超新星残留物（SNR）相关的HADRONIC $γ$射线来源可以用作从SNR中逃脱宇宙射线的秒表，SNR逐渐从最高能量颗粒发展到随时间到最低的能量颗粒。在这项工作中，我们分析了13.7〜yr \ emph {fermi} -lat数据，以研究SNR G298.6 $ - $ 0.0区域中/周围的$γ$ -Ray功能。通过$γ$ - 射线的空间分析，我们检测到三个类似点的组件。其中，SRC-NE在东部SNR壳中，而SRC-NW毗邻该SNR的西部边缘。 SRC-NE和SRC-NW在1.8〜GEV左右/低于/以下的能量表现出光谱中断，这表明旧的SNR年龄为$> $ 10〜KYR。我们还调查了G298.6 $ - 0.0区域的X射线排放，以及Chandra-Acis数据。我们检测到一个扩展的KEV源，在无线电外壳内有一个中央填充的结构。 X射线光谱非常适合一个模型，该模型假定热等离子体的碰撞电离平衡，从而进一步支撑旧的SNR年龄。根据我们对Nanten共同和ATCA-Parkes Hi-Line数据的分析，我们确定了$ \ sim $ 10.1〜kpc的运动距离，从我们到G298.6 $ - $ 0.0。这个距离需要$ \ sim $ 15.5〜PC的SNR的大物理半径，这是老年$> $ 10〜Kyr的附加证据。此外，CO数据立方体使我们能够三维定位分子云（MCS），这些云可能与SNR G298.6 $ - $ 0.0相互作用，并且可以考虑在SRC-NE或SRC-NW上检测到的Hadroonic $γ$ - 砂。此外，多波长的观测特性一致暗示SNR-MC相互作用主要发生在东北方向上。
Hadronic $γ$-ray sources associated with supernova remnants (SNRs) can serve as stopwatches for the escape of cosmic rays from SNRs, which gradually develops from highest-energy particles to lowest-energy particles with time. In this work, we analyze the 13.7~yr \emph{Fermi}-LAT data to investigate the $γ$-ray feature in/around the SNR G298.6$-$0.0 region. With $γ$-ray spatial analyses, we detect three point-like components. Among them, Src-NE is at the eastern SNR shell, and Src-NW is adjacent to the western edge of this SNR. Src-NE and Src-NW demonstrate spectral breaks at energies around/below 1.8~GeV, suggesting an old SNR age of $>$10~kyr. We also look into the X-ray emission from the G298.6$-$0.0 region, with the Chandra-ACIS data. We detected an extended keV source having a centrally filled structure inside the radio shell. The X-ray spectra are well fit by a model which assumes a collisional ionisation equilibrium of the thermal plasma, further supporting an old SNR age. Based on our analyses of the NANTEN CO- and ATCA-Parkes HI-line data, we determined a kinematic distance of $\sim$10.1~kpc from us to G298.6$-$0.0. This distance entails a large physical radius of the SNR of $\sim$15.5~pc, which is an additional evidence for an old age of $>$10~kyr. Besides, the CO data cube enables us to three-dimensionally locate the molecular clouds (MCs) which are potentially interacting with SNR G298.6$-$0.0 and could account for the hadronic $γ$-rays detected at Src-NE or Src-NW. Furthermore, the multiwavelength observational properties unanimously imply that the SNR--MC interaction occurs mainly in the northeast direction.
