武仙座X-1/HZ低态和短高态大气反射的光谱特征
Spectral Signature of Atmospheric Reflection in Hercules X-1/HZ Hercules During Low and Short-High States
摘要：
本文分析了双X射线脉冲星Her X-1/HZ Her在短高态和前一低态的一个双轨道期间的RXTE/PCA X射线谱，该谱由两个连续谱分量（吸收和未吸收）很好地描述。由此产生的光谱参数与轨道相位调制。在低态期间，通量的一个重要组成部分及其光谱与伴星HZ Her表面的X射线反射一致。该组成部分的X射线光谱比Her X-1系统的其余通量明显更硬。低态的第二个成分与来自吸积盘日冕的发射相一致。在短高期间，第三个强分量存在较软的光谱，这与中子星和吸积盘有关。由于中子星和吸积盘的直接辐射，反射辐射不太清楚，但短高态期间的参数和通量调制表明它的存在。在低态下，硬X射线通量（$h ν$ $>$ $10 keV$）在轨道相位$ϕ_{orb}\simeq$ 0.55处达到峰值，这是从伴星大气反射的简单模型中预期的。这种偏移表明伴星的X射线照射是不对称的，这可能是由于吸积盘和/或气流对HZ Her内表面的遮蔽。
英文摘要：
We analyse RXTE/PCA X-ray spectra of the binary X-ray pulsar Her X-1/HZ Her during short high state and one binary orbit in the preceding low state, just before short high turn-on. The spectrum is well described by two continuum components (absorbed and unabsorbed). The resulting spectral parameters are modulated with orbital phase. During low state a significant component of the flux, and its spectrum, is consistent with X-ray reflection off the face of the companion star HZ Her. This component has a significantly harder X-ray spectrum than the rest of the flux from the Her X-1 system. A second component in low state is consistent with emission from the accretion disk corona. During short high a third strong component is present with a softer spectrum, which is associated with the neutron star and accretion disk. Due to this direct emission from the neutron star and accretion disk, the reflected emission is less clear, however parameters and fluxes modulations during short high state indicate its presence. In low state, the hard X-ray flux ($h ν$ $>$ $10 keV$) peaks at orbital phase $ϕ_{orb}\simeq$ 0.55, which is expected from a simple model of atmospheric reflection from the companion star. The offset indicates an asymmetry in the X-ray illumination of the companion, which could be due to shadowing of the the inner face of HZ Her by the accretion disk and/or stream.
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