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首页> 外文期刊>The Astrophysical journal >DIFFUSE X-RAY EMISSION FROM THE HYDROGEN-DEFICIENT PLANETARY NEBULA ABELL 30
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DIFFUSE X-RAY EMISSION FROM THE HYDROGEN-DEFICIENT PLANETARY NEBULA ABELL 30

机译：氢缺乏行星状星云30的X射线漫射

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摘要

We have detected diffuse X-ray emission within the planetary nebula shell of Abell 30, using a 21.8 ks ROSAT Position Sensitive Proportional Counter observation. The spectrum is very soft, with almost all source counts at energies below 0.4 keV. The extended emission is real because most of the detected counts are within the 0.2-0.4 keV band, which is not seriously plagued by the electronic ghost-image problem. The best-fit Raymond & Smith plasma emission models give plasma temperatures of (2-4.5) X 10~5 K. The X-ray emission could arise from the hot shocked stellar wind or the central H-poor nebula shocking the ambient H-rich material. Low plasma temperatures are expected in shocked stellar wind, if there is a strong heat conduction at the interface between the hot shocked wind and the surrounding cool nebular shell, or if the fast stellar wind is mass-loaded by the ejecta clumps. Low plasma temperatures are also expected behind the moderate shock of the H-poor shell advancing into the H-rich envelope. High-resolution X-ray images of A30 are needed to determine more accuratelv the relationshio between the X-rav emission and the nebular shells.
机译：我们使用21.8 ks ROSAT位置敏感比例计数器观测到了Abell 30行星状星云壳内的散射X射线发射。频谱非常柔和，几乎所有源数都在能量低于0.4 keV时。扩展的发射是真实的，因为大多数检测到的计数都在0.2-0.4 keV范围内，这不会受到电子重影问题的严重困扰。最佳拟合的Raymond＆Smith等离子发射模型给出的等离子温度为（2-4.5）X 10〜5K。X射线发射可能是由热冲击的恒星风或中央H差星云对周围H-丰富的材料。如果在热的冲击风和周围的冷星云壳之间的界面处有很强的热传导，或者快速的恒星风被喷射团块负荷，那么在恒星风中等离子体的温度预计会很低。在贫H壳进入富H包膜的中等冲击之后，预计等离子体温度也较低。需要A30的高分辨率X射线图像来确定X-rav发射与星状壳之间的关系更准确。

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