含MAXI的GX 301-2的轨道相位分辨光谱
Orbital phase resolved spectroscopy of GX 301-2 with MAXI
摘要：
GX 301-2是一个明亮的HMXB，轨道周期为41.5天，具有稳定的周期性轨道强度调制和强烈的近星点前X射线耀斑。已经提出了几种模型来解释不同轨道相位的吸积，通过恒星风，赤道盘和来自伴星的吸积流来调用吸积。我们目前的结果，详尽的轨道相位分辨光谱测量GX 301-2使用的数据从气体狭缝相机机载MAXI。通过对MAXI数据的光谱分析，发现铁发射线的吸收柱密度和等效宽度与轨道有很强的依赖关系。在近星点通过后，在轨道相位范围0.10-0.30内，铁谱线的相当大的宽度和柱密度的很小的值表明，在这些轨道相位范围内，中子星后面存在高密度吸收物质。低能量过剩也被发现在光谱中的轨道相位周围的前近星点X射线耀斑。利用这些参数的轨道依赖关系，对GX 301-2中中子星吸积模式的各种模型进行了检验。
英文摘要：
GX 301-2, a bright HMXB with an orbital period of 41.5 days, exhibits stable periodic orbital intensity modulations with a strong pre-periastron X-ray flare. Several models have been proposed to explain the accretion at different orbital phases, invoking accretion via stellar wind, equatorial disk, and accretion stream from the companion star. We present results from exhaustive orbital phase resolved spectroscopic measurements of GX 301-2 using data from the Gas Slit Camera onboard MAXI. Using spectroscopic analysis of the MAXI data with unprecendented orbital coverage for many orbits continuously, we have found a strong orbital dependence of the absorption column density and equivalent width of the iron emission line. A very large equivalent width of the iron line along with a small value of the column density in the orbital phase range 0.10-0.30 after the periastron passage indicates presence of high density absorbing matter behind the neutron star in these orbital phase range. A low energy excess is also found in the spectrum at orbital phases around the pre-periastron X-ray flare. The orbital dependence of these parameters are then used to examine the various models about mode of accretion onto the neutron star in GX 301-2.
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