对大麦云星云超新星遗迹的多频率研究。DEM L205超新星遗迹状态的确认
Multi-frequency study of supernova remnants in the Large Magellanic Cloud. Confirmation of the supernova remnant status of DEM L205
摘要：
我们提出了新的X射线和无线电数据的LMC SNR候选DEM L205，获得XMM牛顿和ATCA，以及存档的光学和红外观测。我们使用各种波长的数据来研究这个物体及其复杂的邻域，特别是在过去和现在的恒星形成活动的背景下，围绕着源。通过对X射线谱的分析，我们得到了一些残骸的性质，如年龄和爆炸能量。超新星遗迹的特征在所有观测到的波长检测：软和扩展的X射线发射观察到，从一个热等离子体与温度kT之间的0.2千电子伏和0.3千电子伏。光学线发射的特征在于增强的[SII]/Halpha比和壳状形态，与X射线发射相关。在近红外波长（< 10微米）处没有或仅暂时检测到该源，但在中红外和远红外波长（24和70微米）处检测到类似电弧的发射，这可以明确地与残余物相关联。我们认为，由恒星辐射和冲击波加热的尘埃的热辐射是红外辐射的主要贡献者。最后，一个扩展的和微弱的非热无线电发射与其他波长的残留物相关，我们发现一个无线电频谱指数在-0.7和-0.9之间，在信噪比的范围内。残骸的大小约为79 x64 pc，我们估计其动力学年龄约为35000年。我们确定DEM L205为新的SNR。这个物体是大麦哲伦星云中已知的最大的遗迹之一。众多的大质量恒星和最近爆发的恒星形成周围的来源强烈表明，核心坍缩超新星是这个遗迹的祖先。（节略）
英文摘要：
We present new X-ray and radio data of the LMC SNR candidate DEM L205, obtained by XMM-Newton and ATCA, along with archival optical and infrared observations. We use data at various wavelengths to study this object and its complex neighbourhood, in particular in the context of the star formation activity, past and present, around the source. We analyse the X-ray spectrum to derive some remnant's properties, such as age and explosion energy. Supernova remnant features are detected at all observed wavelengths: soft and extended X-ray emission is observed, arising from a thermal plasma with a temperature kT between 0.2 keV and 0.3 keV. Optical line emission is characterised by an enhanced [SII]/Halpha ratio and a shell-like morphology, correlating with the X-ray emission. The source is not or only tentatively detected at near-infrared wavelengths (< 10 microns), but there is a detection of arc-like emission at mid and far-infrared wavelengths (24 and 70 micron) that can be unambiguously associated with the remnant. We suggest that thermal emission from dust heated by stellar radiation and shock waves is the main contributor to the infrared emission. Finally, an extended and faint non-thermal radio emission correlates with the remnant at other wavelengths and we find a radio spectral index between -0.7 and -0.9, within the range for SNRs. The size of the remnant is ~79x64 pc and we estimate a dynamical age of about 35000 years. We definitely confirm DEM L205 as a new SNR. This object ranks amongst the largest remnants known in the LMC. The numerous massive stars and the recent outburst in star formation around the source strongly suggest that a core-collapse supernova is the progenitor of this remnant. (abridged)
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