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arXiv 1809.02481astro-ph.GAastro-ph.HE
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大麦云星云中超新星遗迹N63A的ALMA CO观测:发现嵌在冲击电离和光电离星云中的致密分子云

ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-Ionized and Photoionized Nebulae

H. Sano, H. Matsumura, T. Nagaya, Y. Yamane, R. Z. E. Alsaberi, M. D. Filipovic, K. Tachihara, K. Fujii, K. Tokuda, K. Tsuge, S. Yoshiike, T. Onishi, A. Kawamur… 展开作者

H. Sano, H. Matsumura, T. Nagaya, Y. Yamane, R. Z. E. Alsaberi, M. D. Filipovic, K. Tachihara, K. Fujii, K. Tokuda, K. Tsuge, S. Yoshiike, T. Onishi, A. Kawamura, T. Minamidani, N. Mizuno, H. Yamamoto, S. Inutsuka, T. Inoue, N. Maxted, G. Rowell, M. Sasaki, Y. Fukui

摘要:

利用ALMA和ASTE对大麦哲伦星云N63 A超新星遗迹进行了新的$^{12}$ CO($J$ = 1-0,3-2)观测。我们发现三个巨大的分子云朝着东北,东部,和附近的SNR的中心。使用ALMA数据,我们空间分辨cluerous分子云嵌入光学星云中的冲击电离和光电离叶发现以前的H $α$和[S II]观测。分子云的总质量对于冲击电离区是$\sim$ $800$ $M_{\odot}$,对于光电离区是$\sim$ $1700$ $M_{\odot}$。空间分辨X射线光谱显示,朝向分子云的吸收柱密度为$\sim$ $1.5$ - $6.0\times10^{21}$ cm $^{-2}$,其为每个区域的平均星际质子柱密度的$\sim$ $1.5$ - $15$倍。这意味着X射线不仅在分子云后面产生,而且在它们前面产生。我们的结论是,密集的分子云已被完全吞没的冲击波,但仍然幸存下来的侵蚀,由于其高密度和短的相互作用时间。除了热等离子体成分外,吸收幂律或高温等离子体模型很好地解释了朝向气体团簇的X射线光谱,这意味着激波-云相互作用通过激波电离和磁场放大有效地工作于这两种情况。如果强子γ射线在GeV波段占主导地位,宇宙射线质子的总能量计算为$\sim$ $0.3$ - $1.4\times10^{49}$ erg,估计的ISM质子密度为$\sim$ $190\pm90$ cm $^{-3}$,包含冲击电离气体和中性原子氢。

英文摘要:

We carried out new $^{12}$CO($J$ = 1-0, 3-2) observations of a N63A supernova remnant (SNR) from the LMC using ALMA and ASTE. We find three giant molecular clouds toward the northeast, east, and near the center of the SNR. Using the ALMA data, we spatially resolved clumpy molecular clouds embedded within the optical nebulae in both the shock-ionized and photoionized lobes discovered by previous H$α$ and [S II] observations. The total mass of the molecular clouds is $\sim$$800$ $M_{\odot}$ for the shock-ionized region and $\sim$$1700$ $M_{\odot}$ for the photoionized region. Spatially resolved X-ray spectroscopy reveals that the absorbing column densities toward the molecular clouds are $\sim$$1.5$-$6.0\times10^{21}$ cm$^{-2}$, which are $\sim$$1.5$-$15$ times less than the averaged interstellar proton column densities for each region. This means that the X-rays are produced not only behind the molecular clouds, but also in front of them. We conclude that the dense molecular clouds have been completely engulfed by the shock waves, but have still survived erosion owing to their high-density and short interacting time. The X-ray spectrum toward the gas clumps is well explained by an absorbed power-law or high-temperature plasma models in addition to the thermal plasma components, implying that the shock-cloud interaction is efficiently working for both the cases through the shock ionization and magnetic field amplification. If the hadronic gamma-ray is dominant in the GeV band, the total energy of cosmic-ray protons is calculated to be $\sim$$0.3$-$1.4\times10^{49}$ erg with the estimated ISM proton density of $\sim$$190\pm90$ cm$^{-3}$, containing both the shock-ionized gas and neutral atomic hydrogen.

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