arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.06973astro-ph.HEastro-ph.GA
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超新星遗迹G43 .9+1.6周围的分子云:缔合和非缔合

Molecular Clouds Surrounding Supernova Remnant G43.9+1.6: Associated and Non-associated

Xin Zhou, Yang Su, Ji Yang, Yang Chen, Ye Xu, Xuepeng Chen, Shaobo Zhang

摘要:

许多超新星遗迹(SNRs)被认为是在分子环境中演化的,但SNRs和分子云(MC)之间的关系往往不清楚。我们利用CO谱线观测研究了SNR G43.9+1.6附近的分子环境。我们研究了不同速度下信噪比与MCs之间的相关性,发现了两个速度分量,即$\sim$ 5 km s $^{-1}$和$\sim$ 50 km s $^{-1}$,显示了与残骸的空间相关性。然而,没有动力学证据的干扰被发现的$\sim$ 5公里秒$^{-1}$速度分量。在$\sim$ 5 km s $^{-1}$速度分量处,无论是近距离还是远距离,所导出的物理参数也是不合理的。结果表明,信噪比与$\sim$ 5 km s $^{-1}$速度分量无关,它们的空间相关性只是一种机会相关。对于$\sim$ 50 km s $^{-1}$速度分量,扰动的动力学证据以及空间相关性表明,它与SNR有关。我们发现,从沿残核边缘分布的分子团簇中提取的CO光谱都具有展宽成分,可以用高斯函数进行拟合。通过进一步的分析,我们认为,SNR是在近运动学距离约3.1千秒差距。

英文摘要:

Many supernova remnants (SNRs) are considered to evolve in molecular environments, but the associations between SNRs and molecular clouds (MCs) are often unclear. Being aware of such ambiguous case, we report our study on the molecular environment towards the SNR G43.9+1.6 by CO line observations. We investigated the correlations between the SNR and MCs at different velocities, and found two velocity components, i.e. $\sim$5 km s$^{-1}$ and $\sim$50 km s$^{-1}$ velocity components, showing spatial correlations with the remnant. However, no dynamical evidence of disturbance was found for the $\sim$5 km s$^{-1}$ velocity component. At the distance of the $\sim$5 km s$^{-1}$ velocity component, either near or far distance, the derived physical parameters are unreasonable too. We conclude that the SNR is not associated with the $\sim$5 km s$^{-1}$ velocity component, and their spatial correlation is just a chance correlation. For the $\sim$50 km s$^{-1}$ velocity component, dynamical evidence of disturbances, as well as the spatial correlation, indicate that it is associated with the SNR. We found that all the CO spectra extracted from the molecular clumps distributed along the border of the remnant are with broadened components presented, which can be fitted by Gaussian functions. By further analysis, we suggest that the SNR is at a near kinematic distance of about 3.1 kpc.

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