arXiv 0901.32282009-01-21astro-ph.GA

混合形态超新星遗迹中的金属丰度：IC443和G166 .0+4.3的情况

On the metal abundances inside mixed-morphology supernova remnants: the case of IC443 and G166.0+4.3

F. Bocchino, M. Miceli, E. Troja

备注：: A&A in press. For journal style pdf file, http://www.astropa.unipa.it/Library/OAPA_preprints/fb10742.pdf
DOI：: 10.1051/0004-6361/200810742

摘要：

混合形态超新星遗迹（MMSNRs）研究的最新进展显示，这些遗迹的一小部分内存在富含金属的X射线发射等离子体，这些物体的传统模型没有适当解决的功能。MMSNRs的数据和模型的比较需要化学和化学参数的径向分布，但这些仅在少数情况下可用。我们分析了两个MMSNRs，即IC 443和G166.0+4.3，以前已知的太阳能金属丰度的XMM-牛顿数据，我们进行空间分辨的X射线发射光谱分析。我们在IC 443北部的硬X射线亮峰中检测到Ne、Mg和Si的丰度增强，在G166.0+4.3的外部区域检测到S的丰度增强。金属丰度在两个遗迹中分布不均匀。蒸发云模式和辐射信噪比模式不能一致地再现所有的观测结果。我们认为，进一步的深X射线观测MMSNRs可能会揭示更多的金属丰富的对象。需要更详细的模型，其中包括ISM喷出物混合，以解释这一日益增长的MMSNRs亚类的性质。

英文摘要：

Recent developments on the study of mixed morphology supernova remnants (MMSNRs) have revealed the presence of metal rich X-ray emitting plasma inside a fraction of these remnant, a feature not properly addressed by traditional models for these objects. Radial profiles of thermodynamical and chemical parameters are needed for a fruitful comparison of data and model of MMSNRs, but these are available only in a few cases. We analyze XMM-Newton data of two MMSNRs, namely IC443 and G166.0+4.3, previously known to have solar metal abundances, and we perform spatially resolved spectral analysis of the X-ray emission. We detected enhanced abundances of Ne, Mg and Si in the hard X-ray bright peak in the north of IC443, and of S in the outer regions of G166.0+4.3. The metal abundances are not distributed uniformly in both remnants. The evaporating clouds model and the radiative SNR model fail to reproduce consistently all the observational results. We suggest that further deep X-ray observations of MMSNRs may reveal more metal rich objects. More detailed models which include ISM-ejecta mixing are needed to explain the nature of this growing subclass of MMSNRs.

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