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arXiv 1012.5703astro-ph.GAastro-ph.HE
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SNR 0104-72.3:恒星形成区的Ia型超新星遗迹?

SNR 0104-72.3: A remnant of Type Ia Supernova in a Star-forming region?

Jae-Joon Lee, Sangwook Park, John Patrick Hughes, Patrick O. Slane, David N. Burrows

摘要:

本文报道了我们对小麦哲伦星云(SMC)中超新星遗迹(SNR)0104-72.3的110 kS钱德拉观测。X射线形貌显示,沿西北-东南方向有两个突出的裂片,东部有一个柔和的微弱弧形。先前的低分辨率X射线图像将东南叶的未解析发射归因于Be/X射线星。我们的高分辨率钱德拉数据清楚地表明,这种发射是扩散的,冲击加热的等离子体,可以忽略不计的X射线发射从Be星。东部的弧在位置上与光学和红外观测中看到的灯丝重合。它的X射线光谱与正常SMC丰度的等离子体非常吻合,表明它来自受冲击的环境气体。叶的X射线光谱显示过量的铁,这被解释为发射从反向冲击富铁喷出物。瓣和弧的整体频谱特性类似于Ia型SNR,并且我们提出SNR 0104-72.3是SMC中稳健候选Ia型SNR的第一种情况。另一方面,残骸似乎与东边的稠密云层相互作用,并与附近的恒星形成区有关。这些特征对于标准Ia型SNR是不寻常的。我们的研究结果提出了一个有趣的可能性,即SNR 0104-72.3的祖先可能是一个相对年轻的白矮星。

英文摘要:

We report our 110 ks Chandra observations of the supernova remnant (SNR) 0104-72.3 in the Small Magellanic Cloud (SMC). The X-ray morphology shows two prominent lobes along the northwest-southeast direction and a soft faint arc in the east. Previous low resolution X-ray images attributed the unresolved emission from the southeastern lobe to a Be/X-ray star. Our high resolution Chandra data clearly shows that this emission is diffuse, shock-heated plasma, with negligible X-ray emission from the Be star. The eastern arc is positionally coincident with a filament seen in optical and infrared observations. Its X-ray spectrum is well fit by plasma of normal SMC abundances, suggesting that it is from shocked ambient gas. The X-ray spectra of the lobes show overabundant Fe, which is interpreted as emission from the reverse-shocked Fe-rich ejecta. The overall spectral characteristics of the lobes and the arc are similar to those of Type Ia SNRs, and we propose that SNR 0104-72.3 is the first case for a robust candidate Type Ia SNR in the SMC. On the other hand, the remnant appears to be interacting with dense clouds toward the east and to be associated with a nearby star-forming region. These features are unusual for a standard Type Ia SNR. Our results suggest an intriguing possibility that the progenitor of SNR 0104-72.3 might have been a white dwarf of a relatively young population.

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