伴有OH 1720 MHz脉泽发射的混合形态超新星遗迹的X射线特征研究

A study of X-ray characteristics of mixed -morphology supernova remnants accompanied by OH maser emission at 1720MHz

在银河系中,超新星遗迹的射电巡视揭示了19个伴有OH1720MHz脉泽发射的超新星遗迹.在从超新星遗迹膨胀到分子云的激波波面的后面产生了这一类不寻常的脉泽源.这个模型的重要点是从超新星遗迹来的X射线促使产生OH分子.研究伴有OH 1720 MHz脉泽发射的混合形态超新星遗迹的X射线特征是很重要的.研究了这19 个伴有OH 1720 MHz脉泽发射的混合形态超新星遗迹的X射线特征.得到了这些源的X 射线物理参数之间的一些相关关系和反相关关系. X射线电离率ζ与θ、D、r、r2 等物理量均不相关,而与Lx之间存在着正相关关系.另外超新星遗迹的X射线光度与相伴的OH 1720 MHz脉泽的最弱的束流量密度之间存在着紧密的正相关关系.这些都说明从超新星遗迹来的X射线发射足够在激波波阵面后面分解水分子并产生OH 1720 MHz 脉泽.

Radio surveys of supernova remnants (SNRs) in the Galaxy have discovered 19 SNRs accompanied by OH maser emission at 1720MHz. These unusual maser sources are suggested to be produced behind a shock front from the expansion of a supernova remnant running into a molecular cloud. An important ingredient of this model is that X-ray emission from the remnant enhances the production of OH molecules. To study X-ray characteristics of mixed-morphology supernova remnants accompanied by OH maser emission at 1720MHz is very important. The X-ray characteristics have been studied. Some corrlations and anti-correlations among the X-ray physical parameters have been obtained. The ioniza-tion rate of X-ray is not correlated with θ, D, r, r2, respectively, but it is correlated with X-ray luminosity Lx. Meantime Lx is correlated with the beam flux density of the weakest feature of OH maser emission at 1720MHz accompanied by SNRs very well. These mean that the X-ray emission from the SNRs is sufficient to dissociate water molecules behind a shock front and produce the OH 1720 MHz masers.