The Cygnus Loop: a detailed comparison of X-ray and optical emission
The Cygnus Loop: a detailed comparison of X-ray and optical emission
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DOI：
10.1086/163843
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发表时间：
1986-01
期刊：
影响因子：
--
通讯作者：
J. J. Hester-J.;D. Cox
中科院分区：
文献类型：
--
作者：
J. J. Hester-J.;D. Cox
在分辨率为17弧秒的比较，提出了禁止O III和禁止S II和热X射线发射场的天鹅座圈SNR的东南边缘的光发射之间。光学和X射线发射之间的关系，在该领域的描述，概括为一个整体的循环时，可能的。几种可能的解释存在明亮的X射线发射附近的光发射的数据的基础上进行评估。这些机制包括蒸发、震前云间介质密度的逐渐变化和梯度，以及已经被绝热冲击波加热到X射线温度的材料的额外压缩。额外的压缩可能是由于爆炸波本身的快速减速，或者是由于密集云层周围的反射或弓形冲击波的重新传播。SNR演变和星际介质的模型的意见的影响进行了讨论。
A comparison at a resolution of 17 arcsec is presented between optical emission from forbidden O III and forbidden S II and the thermal X-ray emission for a field on the southeast edge of the Cygnus Loop SNR. The relationship between optical and X-ray emission in the field is described, generalizing to the Loop as a whole when possible. Several possible explanations for the presence of bright X-ray emission in the vicinity of optical emission are presented and evaluated based on the data. These mechanisms involve evaporation, gradual variations and gradients in the density of the preshock intercloud medium, and additional compression of material which has already been heated to X-ray temperatures by the adiabatic blast wave. The additional compression could result from rapid deceleration of the blast wave itself or from reshocking by reflected or bow shocks around dense clouds. Implications of the observations for models of SNR evolution and the interstellar medium are discussed.