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arXiv 1502.00642astro-ph.HE
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混合形态超新星遗迹3C400.2的Chandra X射线研究

A Chandra X-ray study of the mixed-morphology supernova remnant 3C400.2

Sjors Broersen, Jacco Vink

摘要:

我们提出了一个分析档案钱德拉观测的混合形态残留3C400.2。我们分析了残骸不同部分的光谱,以观察等离子体特性是否提供了混合形态类起源的线索。这些残骸经常表现出过度电离,这是热等离子体快速冷却的标志,以及元素的超太阳丰度,这是喷出物排放的标志。我们的分析表明,3C400.2的热辐射可以很好地用一个两分量非平衡电离模型来解释,其中一个分量是欠电离的,具有高温($kT \approx 3.9$ keV)和超太阳丰度,而另一个分量具有低得多的温度($kT \approx 0.14$ keV)和太阳丰度,并显示出过电离的迹象。温度结构,丰度值和密度之间的不同模型组件的对比表明,热的组件来自喷出物等离子体,而较冷的组件有星际物质的起源。这似乎是第一次在超新星遗迹的外部区域发现过电离等离子体,而内部区域的喷出物成分是欠电离的。此外,与喷出物相关的非电离平衡等离子体成分仅限于残留物的中心,较亮的部分,而较冷的成分主要存在于外部区域。因此,我们的数据可以最自然地解释一个进化的情况下,外部的残留物正在迅速冷却,由于已经扫了高密度的ISM,而内部的部分是非常热的,冷却效率低,由于等离子体的密度。这也被称为遗迹X射线场景。

英文摘要:

We present an analysis of archival Chandra observations of the mixed-morphology remnant 3C400.2. We analysed spectra of different parts of the remnant to observe if the plasma properties provide hints on the origin of the mixed-morphology class. These remnants often show overionization, which is a sign of rapid cooling of the thermal plasma, and super-solar abundances of elements which is a sign of ejecta emission. Our analysis shows that the thermal emission of 3C400.2 can be well explained by a two component non-equilibrium ionization model, of which one component is underionized, has a high temperature ($kT \approx 3.9$ keV) and super-solar abundances, while the other component has a much lower temperature ($kT \approx 0.14$ keV), solar abundances and shows signs of overionization. The temperature structure, abundance values and density contrast between the different model components suggest that the hot component comes from ejecta plasma, while the cooler component has an interstellar matter origin. This seems to be the first instance of an overionized plasma found in the outer regions of a supernova remnant, whereas the ejecta component of the inner region is underionized. In addition, the non-ionization equilibrium plasma component associated with the ejecta is confined to the central, brighter parts of the remnant, whereas the cooler component is present mostly in the outer regions. Therefore our data can most naturally be explained by an evolutionary scenario in which the outer parts of the remnant are cooling rapidly due to having swept up high density ISM, while the inner parts are very hot and cooling inefficiently due to low density of the plasma. This is also known as the relic X-ray scenario.

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