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arXiv 1012.2918astro-ph.SR
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与第谷超新星遗迹有关的分子云的亚毫米/毫米观测

Submillimeter/millimeter observations of the molecular clouds associated with the Tycho' Supernova Remnant

Jin-Long Xu, Jun-Jie Wang, Martin Miller

摘要:

我们用KOSMA 3米望远镜对第谷超新星遗迹进行了CO J=2-1和CO J=3-2的观测。从这些观察中,我们确定了三个分子云(MC)周围的SNR。西南部的小云团是首次发现的。在北、东方向,空间上相邻的两个MCs(云A和云B)呈现弓形形态,并具有较宽的发射线,为SNR-MCs相互作用提供了直接证据。在-69~-59 km \s处发现了MCs,与第谷的信噪比(SNR)吻合较好。与第谷的SNR相关的MC的质量约为2130太阳质量。位置-速度图显示两个云在速度上相邻,这意味着在该区域可能发生云-云碰撞。三个MC的CO积分线强度比I(COJ =3-2/COJ =2-1)的最大值(0.66)与以前对单个银河系MC的测量结果一致,表明SNR激波正好进入MC。两个MC具有线强度比梯度。比值的分布似乎表明,地震从西南向东北传播。

英文摘要:

We have carried out CO J=2-1 and CO J=3-2 observations toward Tycho's supernova remnant (SNR) using the KOSMA 3m-Telescope. From these observations we identified three molecular clouds (MCs) around the SNR. The small cloud in the southwest was discovered for the first time. In the north and east, two MCs (cloud A and cloud B) adjacent in space display a bow-shaped morphology, and have broad emission lines, which provide some direct evidences of the SNR-MCs interaction. The MCs is revealed at -69~-59 km \s, well coincident with the Tycho's SNR. The MCs associated with Tycho's SNR have a mass of ~2130 sun masses. Position-velocity diagrams show the two clouds adjacent in velocity which means possible cloud-cloud collision in this region. The maximum value (0.66) of integrated CO line intensity ratio I(CO J=3-2/CO J=2-1) for the three MCs agrees well with the previous measurement of individual Galactic MCs, implying that the SNR shock just drove into the MCs. The two MCs have a line intensity ratio gradient. The distribution of the ratio appears to indicate that the shock propagates from the southwest to the northeast.

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