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arXiv 0908.4311astro-ph.HE
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超新星遗迹HB 21:II中分子冲击的红外研究。南方地区冲击H $_2$气体的热掺混

Infrared Studies of Molecular Shocks in the Supernova Remnant HB 21: II. Thermal Admixture of Shocked H$_2$ Gas in the South

Jong-Ho Shinn, Bon-Chul Koo, Michael G. Burton, Ho-Gyu Lee, Dae-Sik Moon

摘要:

我们目前的近红外和中红外观测的冲击波云的相互作用区域在南部的超新星遗迹HB 21,与AKARI卫星上的红外相机(IRC)和宽红外相机(WIRC)在帕洛玛5米望远镜。IRC 4 μ m(N4)、7 μ m(S7)和11 μ m(S11)波段图像和WIRC H2 v=1->0 S(1)2.12 μ m图像显示了类似的扩散特征,围绕冲击CO云。通过与几种激波模型的H_2谱线发射的比较,分析了这种发射。IRC颜色可以用H2气体的热混合物模型很好地解释,其无穷小的H2柱密度与温度$T$,$dN\sim T^{-b}dT$具有幂律关系,其中n(H2)$\sim3.9\times10^4$ cm^{-2},$b\sim4.2$和N(H2;T> 100 K)$\sim2.8\times10^{21}$ cm^{-2}。我们解释了这些参数与几个不同的图片的冲击云相互作用-多平面C-冲击,弓冲击,和冲击块-并讨论他们的弱点和优势。观测到的H2 v=1->0 S(1)强度比幂律混合物模型预测的强度大4倍,与HB 21北部的趋势相同(论文I)。我们还探讨了热掺模型的局限性,相对于所导出的模型参数。

英文摘要:

We present near- and mid-infrared observations on the shock-cloud interaction region in the southern part of the supernova remnant HB 21, performed with the InfraRed Camera (IRC) aboard AKARI satellite and the Wide InfraRed Camera (WIRC) at the Palomar 5 m telescope. The IRC 4 um (N4), 7 um (S7), and 11 um (S11) band images and the WIRC H2 v=1->0 S(1) 2.12 um image show similar diffuse features, around a shocked CO cloud. We analyzed the emission through comparison with the H2 line emission of several shock models. The IRC colors are well explained by the thermal admixture model of H2 gas--whose infinitesimal H2 column density has a power-law relation with the temperature $T$, $dN\sim T^{-b}dT$--with n(H2) $\sim3.9\times10^4$ cm^{-2}, $b\sim4.2$, and N(H2;T>100K) $\sim2.8\times10^{21}$ cm^{-2}. We interpreted these parameters with several different pictures of the shock-cloud interactions--multiple planar C-shocks, bow shocks, and shocked clumps--and discuss their weaknesses and strengths. The observed H2 v=1->0 S(1) intensity is four times greater than the prediction from the power-law admixture model, the same tendency as found in the northern part of HB 21 (Paper I). We also explored the limitation of the thermal admixture model with respect to the derived model parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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