频率分辨光谱法探测黑洞双星 MAXI J1820+070 的吸积几何,Monthly Notices of the Royal Astronomical Society

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频率分辨光谱法探测黑洞双星 MAXI J1820+070 的吸积几何
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2021-08-02 , DOI: 10.1093/mnras/stab2191
Magnus Axelsson _{1,

2} , Alexandra Veledina _{3,

4,

5}

Affiliation

X 射线双星硬质和硬质中间态的内部吸积流的几何形状仍然存在争议。利用中子星内部成分探索者对黑洞 X 射线双星 MAXI J1820+070 在 2018 年爆发的上升阶段的观测，我们研究了时间特性的演变，特别是突出的铁 K α 线的特征变异频率. 使用频率分辨光谱，它对线轮廓建模中的不确定性具有鲁棒性，我们发现在明亮的硬状态下，反射发生在距离康普顿区域很远的地方。在从硬到软的转变过程中，可变性表明反射器靠近 X 射线源。平行地，铁线的峰值从 6.5 变为 ∼7 keV，与从靠近黑洞延伸的高度倾斜的圆盘的预期一致。我们还发现，随着源软化，均方根 (rms) 可变性对能量和傅里叶频率的依赖性发生了显着变化。由频率分辨光谱追踪的 rms 能量依赖性、线轮廓和铁线的时间特性的演变都支持截断圆盘/内流几何图形的图像。

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Accretion geometry of the black hole binary MAXI J1820+070 probed by frequency-resolved spectroscopy

The geometry of the inner accretion flow in the hard and hard-intermediate states of X-ray binaries remains controversial. Using Neutron star Interior Composition Explorer observations of the black hole X-ray binary MAXI J1820+070 during the rising phase of its 2018 outburst, we study the evolution of the timing properties, in particular the characteristic variability frequencies of the prominent iron K α line. Using frequency-resolved spectroscopy, which is robust against uncertainties in the line profile modelling, we find that reflection occurs at large distances from the Comptonizing region in the bright hard state. During the hard-to-soft transition, the variability properties suggest that the reflector moves closer to the X-ray source. In parallel, the peak of the iron line shifts from 6.5 to ∼7 keV, becoming consistent with that expected of from a highly inclined disc extending close to the black hole. We additionally find significant changes in the dependence of the root-mean-square (rms) variability on both energy and Fourier frequency as the source softens. The evolution of the rms-energy dependence, the line profile, and the timing properties of the iron line as traced by the frequency-resolved spectroscopy all support the picture of a truncated disc/inner flow geometry.

更新日期：2021-08-02

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