Monte Carlo simulations of the detailed iron absorption line profiles from thermal winds in X-ray binaries

Monte Carlo simulations of the detailed iron absorption line profiles from thermal winds in X-ray binaries
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X 射线双星中热风的详细铁吸收线剖面的蒙特卡罗模拟

DOI:
10.1093/mnras/sty336
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发表时间:
2018
影响因子:
4.8
通讯作者:
Takahashi Tadayuki
Takahashi Tadayuki
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tomaru Ryota;Done Chris;Odaka Hirokazu;Watanabe Shin;Takahashi Tadayuki

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在一些高倾角X射线双星系统中,可以看到来自高电离铁的蓝移吸收线,这表明赤道盘风的存在。这种发射机制还在争论中,但热驱动应该是无处不在的。来自中心源的X射线辐射加热圆盘表面,形成来自外部圆盘的风,其中局部逃逸速度低于声速。圆盘每个部分的质量损失率由中心源的亮度和光谱形状决定。我们使用这些与一个假设的风的密度和速度结构来预测柱密度和电离状态,然后联合收割机结合这与蒙特卡罗辐射传输来预测的吸收(和发射)线轮廓的详细形状。我们在明亮的中子星星双星GX 13+1中看到的持续风上测试了这一点,亮度L/LEdd = 0.5。我们近似地考虑了由于高光度而引起的辐射压的影响,并计算了线特征。我们比较这些最高分辨率的数据,钱德拉三阶光栅光谱,我们在这里显示的第一次。这是该系统中风的第一个物理模型,它成功地再现了数据中看到的许多特征,表明GX 13 +1中的风很可能是热辐射驱动的风。这种方法,结合更好的流线结构来自全辐射流体动力学模拟,将允许未来的热量计数据来探索详细的风结构。
Blueshifted absorption lines from highly ionized iron are seen in some high inclination X-ray binary systems, indicating the presence of an equatorial disc wind. This launch mechanism is under debate, but thermal driving should be ubiquitous. X-ray irradiation from the central source heats disc surface, forming a wind from the outer disc where the local escape velocity is lower than the sound speed. The mass-loss rate from each part of the disc is determined by the luminosity and spectral shape of the central source. We use these together with an assumed density and velocity structure of the wind to predict the column density and ionization state, then combine this with a Monte Carlo radiation transfer to predict the detailed shape of the absorption (and emission) line profiles. We test this on the persistent wind seen in the bright neutron star binary GX 13+1, with luminosityL/LEdd∼ 0.5. We approximately include the effect of radiation pressure because of high luminosity, and compute line features. We compare these to the highest resolution data, theChandrathird-order grating spectra, which we show here for the first time. This is the first physical model for the wind in this system, and it succeeds in reproducing many of the features seen in the data, showing that the wind in GX13+1 is most likely a thermal-radiation driven wind. This approach, combined with better streamline structures derived from full radiation hydrodynamic simulations, will allow future calorimeter data to explore the detail wind structure.
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