论文标题
Alma CO观察到伽马射线超新星残留RX J1713.7-3946：在0.01 PC量表下发现冲击的分子云和细丝
ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7-3946: Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc scales
论文作者
论文摘要
RX J1713.7-3946是一种独特的核心偏转SNR，除了与星际气体云的相互作用外，还发出了由宇宙射线引起的明亮的TEV伽马射线和同步X射线。我们在此处报告ALMA $^{12} $ CO（$ j $ = 1-0）对SNR西北外壳的观察结果。我们新发现了三个分子络合物，包括数十个震惊的分子云和细丝，典型的半径为$ \ sim $ \ sim $ 0.03-0.05 pc，密度为$ \ sim $ \ sim $ 10^4 $ cm $^{ - 3} $。这些Cloudlets和细丝不仅沿着同步器X射线丝，而且位于带有月或年度时间变化的X射线热点附近。我们认为，X射线热点是通过磁场扩增到Mg的磁场相互作用而产生的。 $ \ sim $$ 10^5 $的ISM密度对比度，分子云的共存和$ \ sim $ 0.1 cm $^{ - 3} $的低密度扩散培养基与这样的磁场放大以及风泡场景是一致的。考虑到表面和内部云内的磁场扩增，小尺度的云结构还会影响辐射伽马射线光谱。
RX J1713.7-3946 is a unique core-collapse SNR that emits bright TeV gamma-rays and synchrotron X-rays caused by cosmic rays, in addition to interactions with interstellar gas clouds. We report here on results of ALMA $^{12}$CO($J$ = 1-0) observations toward the northwestern shell of the SNR. We newly found three molecular complexes consisting of dozens of shocked molecular cloudlets and filaments with typical radii of $\sim$0.03-0.05 pc and densities of $\sim$$10^4$ cm$^{-3}$. These cloudlets and filaments are located not only along synchrotron X-ray filaments, but also in the vicinity of X-ray hotspots with month or year-scale time variations. We argue that X-ray hotspots were generated by shock-cloudlet interactions through magnetic-field amplification up to mG. The ISM density contrast of $\sim$$10^5$, coexistence of molecular cloudlets and low-density diffuse medium of $\sim$0.1 cm$^{-3}$, is consistent with such a magnetic field amplification as well as a wind-bubble scenario. The small-scale cloud structures also affect hadronic gamma-ray spectra considering the magnetic field amplification on surface and inside clouds.
