RX J0720 .4-3125的XMM-牛顿RGS光谱：0.57 keV处的吸收特征
XMM-Newton RGS spectrum of RX J0720.4-3125: An absorption feature at 0.57 keV
摘要：
在孤立的中子星RX J 0720.4 -3125的共加RGS谱中发现了0.57keV处的窄吸收特征，其等效宽度为1.35 ± 0.3eV，半高宽约为6.0eV。该特征被识别为高度电离氧OVII的吸收线，最有可能源自RX J0720.4-3125的环境介质。利用光电离代码CLOUDY进行的广泛研究表明，RX J 0720.4 -3125光谱中观测到的光通量过剩至少部分可能源自相对致密（例如nH~10^8 cm^-3）的板层，该板层位于中子星附近（例如~ 10^10 cm）。
英文摘要：
We found a narrow absorption feature at 0.57keV in the co-added RGS spectrum of the isolated neutron star RX J0720.4-3125 with an equivalent width of 1.35+/-0.3eV and FWHM ~6.0eV. The feature was identified with an absorption line of highly ionized oxygen OVII, most probably originating in the ambient medium of RX J0720.4-3125. An extensive investigation with the photo-ionization code CLOUDY indicates the possibility that the optical flux excess observed in the spectrum of RX J0720.4-3125 at least partially originates in a relatively dense (e.g. nH~10^8 cm^-3) slab, located in the vicinity of the neutron star (e.g. ~10^10cm).
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