孤立中子星RBS 1223（1 RXS J130848 .6+212708）的相分辨光谱研究
Phase resolved spectroscopic study of the isolated neutron star RBS 1223 (1RXS J130848.6+212708)
摘要：
将2003-2007年XMM-Newton EPIC pn使用相同仪器设置进行的RBS 1223（1 RXS J130848.6+212708）的所有观测数据合并以形成自旋相位分辨光谱。在X射线谱拟合软件包XSPEC中实现了一系列具有强磁化（$B_{pole} 10^{13}-10^{14}$ G）表面、磁极周围温度和磁场分布以及其上部分电离氢薄大气的复杂中子星模型，用于同步拟合相位分辨谱。马尔可夫链蒙特卡罗（MCMC）方法也被用来验证多参数模型的拟合和估计结果。不同转动相位区间的光谱和高信噪比下不同能带的光变曲线表现出很高的复杂性。光谱可以用叠加在黑体光谱上的高斯吸收线来参数化，而具有双峰形状的光变曲线显示出对能带（13%-42%）的脉冲分数的强烈依赖性，这表明辐射至少从两个发射区域出现。一个模型与凝聚铁表面和部分电离的氢薄的气氛，它上面允许我们同时适合所观察到的一般光谱形状和广泛的吸收功能，在0.3千电子伏在不同的自旋阶段的RBS 1223。它允许约束X射线发射区域的某些物理性质，即温度（$T_{p1} ~ 105$ eV，$T_{p2} ~ 99$ eV）、磁极处的磁场强度（$B_{p1}= B_{p2} ~ 8.6x10^{13}$ G）及其分布参数（$a_{1} 0.61, a_{2} 0.29$，表明不存在强环形磁场分量）。此外，它对RBS 1223的新兴X射线发射和引力红移（$z=0.16^{+0.03}_{-0.01}$）的几何形状提出了一些限制。
英文摘要：
The data from all observations of RBS 1223 (1RXS J130848.6+212708) conducted by XMM-Newton EPIC pn with the same instrumental setup in 2003-2007 were combined to form spin-phase resolved spectra. A number of complex models of neutron stars with strongly magnetized ($B_{pole} 10^{13}-10^{14}$ G) surface, with temperature and magnetic field distributions around magnetic poles, and partially ionized hydrogen thin atmosphere above it have been implemented into the X-ray spectral fitting package XSPEC for simultaneous fitting of phase-resolved spectra. A Markov-Chain-Monte-Carlo (MCMC) approach is also applied to verify results of fitting and estimating in multi parameter models. The spectra in different rotational phase intervals and light curves in different energy bands with high S/N ratio show a high complexity. The spectra can be parameterized with a Gaussian absorption line superimposed on a blackbody spectrum, while the light curves with double-humped shape show strong dependence of pulsed fraction upon the energy band (13%-42%), which indicates that radiation emerges from at least two emitting areas. A model with condensed iron surface and partially ionized hydrogen thin atmosphere above it allows us to fit simultaneously the observed general spectral shape and the broad absorption feature observed at 0.3 keV in different spin phases of RBS 1223. It allowed to constrain some physical properties of X-ray emitting areas, i.e. the temperatures ($T_{p1} ~ 105$ eV, $T_{p2} ~ 99$ eV), magnetic field strengths ($B_{p1}= B_{p2} ~ 8.6x10^{13}$G) at the poles, and their distributions parameters ($a_{1} 0.61, a_{2} 0.29$, indicating an absence of strong toroidal magnetic field component). In addition, it puts some constraints on the geometry of the emerging X-ray emission and gravitational redshift ($z=0.16^{+0.03}_{-0.01}$) of RBS 1223.
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