Vela SNR髋臼杯内部存在物理和化学不均匀性。喷出物碎片的迹象
Physical and chemical inhomogeneities inside the Vela SNR shell. Indications of ejecta shrapnels
摘要：
我们提出了三个XMM-牛顿EPIC观测船帆座SNR的北部边缘的综合分析的结果。这三个点覆盖了主激波阵面后约10 pc ^2（250 pc）的区域，我们的目标是在如此大的尺度上以高分辨率研究X射线发射等离子体的物理和化学性质的空间分布。我们产生计数率图像和等效宽度的Ne IX和Mg XI发射混合物的地图。我们还执行一组物理均匀区域的空间分辨光谱分析。我们揭示了物理和化学的不均匀性，在X射线发射等离子体。特别是，我们发现大的变化的O，Ne，Mg和Fe的丰度。在一些明亮的节点中，我们还发现了意外增强的Ne和Mg丰度，其值显着大于太阳。我们的研究结果支持了一些X射线发射结与以前未检测到的恒星碎片残留物（即）的可能关联。e.在船帆壳内的投影中观察到的碎片。
英文摘要：
We present the results of the combined analysis of three XMM-Newton EPIC observations of the northern rim of the Vela SNR. The three pointings cover an area of ~10 pc^2 (at 250 pc) behind the main shock front and we aim at studying with high resolution the spatial distribution of the physical and chemical properties of the X-ray emitting plasma on this large scale. We produce count-rate images and equivalent width maps of the Ne IX and Mg XI emission blends. We also perform a spatially resolved spectral analysis of a set of physically homogeneous regions. We reveal physical and chemical inhomogeneities in the X-ray emitting plasma. In particular, we find large variations of the O, Ne, Mg, and Fe abundances. In some bright knots we also find unexpectedly enhanced Ne and Mg abundances, with values significantly larger than solar. Our results support a possible association of a few X-ray emitting knots with previously undetected residuals of stellar fragments (i. e. shrapnels) observed, in projection, inside the Vela shell.
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