Aims: We present a study of the superbubble (SB) 30 Dor C and the newly identified MCSNR J0536-6913 in the LMC. Methods: All available XMM-Newton data (exposure times of 420 ks EPIC-pn, 556 ks EPIC-MOS1, 614 ks EPIC-MOS2) were used to characterise the thermal X-ray emission in the region. An analysis of the non-thermal X-rays is also presented and discussed in the context of emission mechanisms previously suggested in the literature. These data are supplemented by X-ray data from Chandra, optical data from the MCELS, and radio data from ATCA and MOST. Results: The brightest thermal emission was found to be associated with a new supernova remnant, MCSNR J0536-6913. X-ray spectral analysis of MCSNR J0536-6913 suggested an ejecta-dominated remnant with lines of O, Ne, Mg, and Si, and a total 0.3-10 keV luminosity of ~8E+34 erg/s. Based on derived ejecta abundance ratios, we determined the mass of the stellar progenitor to be either ~18 M_sun or as high as >40 M_sun, though the spectral fits were subject to assumptions (e.g., uniform temperature and well-mixed ejecta). The thermal emission from the SB exhibited enrichment by alpha-process elements, evidence for a recent core-collapse SNR interaction with the SB shell. We detected non-thermal X-ray emission throughout 30 Dor C, with the brightest regions being highly correlated with the H-alpha and radio shells. We created a non-thermal spectral energy distribution for the north-eastern shell of 30 Dor C which was best-fit with an exponentially cut-off synchrotron model. Conclusions: Thermal X-ray emission from 30 Dor C is very complex, consisting of a large scale SB emission at the eastern shell wall with the brightest emission due to MCSNR J0536-6913. The fact that the non-thermal spectral energy distribution of the SB shell was observed to roll-off is further evidence that the non-thermal X-rays from 30 Dor C are synchrotron in origin.
Multiwavelength study of the newly confirmed supernova remnant MCSNR J0527-7104 in the Large Magellanic Cloud
大麦云星云（LMC）拥有丰富多样的超新星遗迹（SNRs）。需要光学、X射线和射电观测来识别这些信噪比，并确定造成观测到的大量物理特性的各种过程。在本文中，我们试图确认候选SNR [HP 99] 1234，确定在X射线与ROSAT，作为一个真正的SNR补充这些X射线数据与光学和无线电观测。除了ROSAT X射线数据外，还利用麦哲伦云发射线巡天的光学数据和莫隆格洛天文台合成望远镜的新射电数据对这一候选信噪比进行了形态学分析。在光学中检测到增强的[SII]的近似椭圆形壳，典型的SNR（[SII]/Halpha > 0.4）。这种增强与36厘米处的微弱射电发射相一致。根据现有的数据，我们估计残骸的大小为~5.1' x 4.0'（~75 pc x 59 pc）。然而，由于在其末端缺乏光学和无线电发射以及X射线数据的分辨率差，沿着主轴的测量有点不确定。假设该信噪比处于谢多夫相，并采用在附近HII区测得的1.2 × 10 ^-25 g cm^-3的环境质量密度，则对于10^51 erg的典型初始爆炸能量，计算出的年龄估计值约为25 kyr。然而，由于所采用参数的不确定性，应谨慎对待这一年龄估计。对当地恒星星族的分析表明，Ia型事件是这一SNR的前兆，然而，由于祖先是一颗失控的大质量恒星的可能性，不能排除核心坍缩机制。随着X射线，无线电和光学线发射与增强[SII]的检测，该对象被确认为SNR，我们…
Discovery of a dense molecular cloud towards a young massive embedded star in 30 Doradus
大麦云星云中的剑鱼座30区是本星系群中最突出的恒星形成区之一，也是研究低金属环境下恒星形成的主要目标。为了获得尚未消耗或分散的冷气体的更完整的图片，我们搜索了分子云的线发射，这可能与该地区检测到的分子氢发射有关。我们用15米SEST望远镜获得了高灵敏度的12 CO J=2-1图，并辅以13 CO J=2-1和CS J=2-1的定点观测。我们报告了在R136西北方向约20”（约5 pc，距离50 kpc）处发现了一个密集的分子云，这是一个紧凑的大质量中央星团，为LMC中的剑鱼座30提供动力，这可能会引发周围分子云中的恒星形成。我们推导出的分子质量$\lesssim 10^4$ \msol，3 pc的线性半径，作为上限，和$\gtrsim 10^{3}$ cm $^{-3}$的云的平均密度。CS J=2-1发射谱线的检测指示较大的密度，$\sim 10^{6}$ cm $^{-3}$。致密的分子云与分子2.12 μ m H2发射有关。我们认为，所观察到的分子气体可能是致密分子物质的残留物，这些物质在年轻的大质量恒星形成的强紫外线场和风的作用下幸存下来。
