Dust-grain scattering of X-rays observed during the lunar occultation of a transient X-ray source near the Galactic center
Dust-grain scattering of X-rays observed during the lunar occultation of a transient X-ray source near the Galactic center
复制标题
在银心附近瞬变 X 射线源掩月期间观察到的 X 射线尘粒散射
DOI：
10.1086/168637
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
N. Kawai
中科院分区：
文献类型：
--
作者：
K. Mitsuda;T. Takeshima;T. Kii;N. Kawai
在银河系中心区域的月掩星观测中，在1-10 keV的能量带内探测到了围绕点X射线源的扩展X射线辐射。这些扩展的X射线很可能是由于星际尘埃颗粒的X射线散射。瞬态X射线源GS 1741.2-2859/1741.6-2849周围扩展辐射的空间大小和强度已经被广泛研究。空间尺寸与约0.06微米的典型晶粒尺寸一致。强度被用来获得散射光深度的能量依赖性的源，这表明铁的存在的晶粒。颗粒中所含的铁柱密度与中性气体中氢柱密度的比值与铁的宇宙丰度大致一致。参考文献30篇。
Extended X-ray emission surrounding point X-ray sources has been detected in the energy band 1-10 keV during lunar occultation observations of the Galactic center region. These extended X-rays are most likely due to X-ray scattering by interstellar dust grains. The spatial size and the intensity of the extended emission around the transient X-ray source GS 1741.2-2859/1741.6-2849 have been studied extensively. The spatial size is consistent with the typical grain size of about 0.06 micron. The intensity is used to obtain the energy dependence of the scattering optical depth to the source, which suggests the existence of iron in the grains. The ratio of the iron column density contained in the grains to the hydrogen column density of the neutral gas is roughly consistent with the cosmic abundance of iron. 30 refs.