4U 1705-44的硬态和软态的自洽方法
A self-consistent approach to the hard and soft states of 4U 1705-44
摘要：
我们分析了两个XMM牛顿观测明亮的环礁源4U 1705-44，这可以被认为是一个原型的类持久NS LMXB显示硬和软状态。第一次观测是在源处于硬低通量状态时进行的，第二次观测是在软高通量状态时进行的。两个光谱都显示出宽的铁发射线。我们使用一个两个组件的模型，连同反射模型特别适合的情况下，一个中子星，其中的入射光谱具有黑体形状的光谱。在软状态下，反射模型，卷积与相对论涂抹组件，一贯描述了广泛的功能，目前在光谱中，我们发现一个明确的关系，入射通量的温度和较硬的X射线成分，我们解释为边界层发射的温度。在这种状态下，我们发现了会聚的证据，证明边界层的外半径是中子星半径的2倍。在低通量状态下，我们观察到的连续形状的光谱相对于软态的变化。尽管如此，广泛的本地发射功能可以与磁盘反射物质，但在较低的电离状态，并可能产生在一个吸积盘截断在更大的距离。我们的分析提供了强有力的证据表明，在软状态的LMXB的反射分量来自硬X射线的热辐射，我们确定与边界层发射，也存在于连续模型。在硬态下，宽铁线，如果也产生反射，和连续磁盘发射可以自洽占，如果磁盘被截断在一个更大的距离比软态。
英文摘要：
We analyzed two XMM-Newton observations of the bright atoll source 4U 1705-44, which can be considered a prototype of the class of the persistent NS LMXBs showing both hard and soft states. The first observation was performed when the source was in a hard low flux state, the second during a soft, high-flux state. Both the spectra show broad iron emission lines. We fit the spectra using a two-component model, together with a reflection model specifically suited to the case of a neutron star, where the incident spectrum has a blackbody shape. In the soft state, the reflection model, convolved with a relativistic smearing component, consistently describes the broad features present in the spectrum, and we find a clear relation between the temperature of the incident flux and the temperature of the harder X-ray component that we interpret as the boundary layer emission. In this state we find converging evidence that the boundary layer outer radius is ~ 2 times the neutron star radius. In the low flux state, we observe a change in the continuum shape of the spectrum with respect to the soft state. Still, the broad local emission features can be associated with a disk reflecting matter, but in a lower ionization state, and possibly produced in an accretion disk truncated at greater distance. Our analysis provides strong evidence that the reflection component in soft states of LMXBs comes from to hard X-ray thermal irradiation, which we identify with the boundary layer emission, also present in the continuum model. In the hard state, the broad iron line if also produced by reflection, and the continuum disk emission can be self-consistently accounted if the disk is truncated at a greater distance than the soft state.
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