论文标题
静态X射线瞬变中的HA槽深度与倾斜度之间的相关性：GRO J0422+32中低质量黑洞的证据
A correlation between Ha trough depth and inclination in quiescent X-ray transients: evidence for a low-mass black hole in GRO J0422+32
论文作者
论文摘要
我们提出了一种新方法，该方法基于在积聚盘中产生的双峰HA发射曲线，该方法基于槽（t）的深度（t）的深度（XRT）。我们发现，在I（deg）= 93.5 x t +23.7之后，倾斜角（i）与相平均光谱中的t线性相关，并具有足够的轨道覆盖率（> 〜50％）和光谱分辨率。相关性是由线不透明度和局部拓宽的组合引起的，其中领先的（过度拓宽）组件尺度与外盘的去射速度相结合。有趣的是，这样的缩放范围可以通过简单地解决双峰剖面的固有宽度来估计基本比率M1/PORB。我们将T-I相关性应用于GRO J0422+32和SWIFT J1357-0933的二进制倾斜度，这是两个BH XRT，其中强闪烁的活性阻碍了通过椭圆形拟合到光度光度光曲线的值。值得注意的是，GRO J0422+32（i = 55.6+-4.1）的倾斜度意味着BH质量为2.7+0.7-0.5 msun，因此将其放置在将BHS与中子星分开的间隙中。该结果证明了低质量BHS在自然界中存在，并强烈表明所谓的“质量差距”主要由低数量统计数据和可能的观察性偏见产生。另一方面，我们发现Swift J1357-0933包含10.9+1.7-1.6 MSUN BH几乎可以看到（i = 87.4+2.6-5.6 ver）。但是，这种极端的倾向应谨慎对待，因为它依赖于尚未测试的I> 75 ver以外的T-I相关性。
We present a new method to derive binary inclinations in quiescent black hole (BH) X-ray transients (XRTs), based on the depth of the trough (T) from double-peaked Ha emission profiles arising in accretion discs. We find that the inclination angle (i) is linearly correlated with T in phase-averaged spectra with sufficient orbital coverage (>~50 per cent) and spectral resolution, following i (deg)=93.5 x T +23.7. The correlation is caused by a combination of line opacity and local broadening, where a leading (excess broadening) component scales with the de-projected velocity of the outer disc. Interestingly, such scaling allows to estimate the fundamental ratio M1/Porb by simply resolving the intrinsic width of the double-peak profile. We apply the T-i correlation to derive binary inclinations for GRO J0422+32 and Swift J1357-0933, two BH XRTs where strong flickering activity has hindered determining their values through ellipsoidal fits to photometric light curves. Remarkably, the inclination derived for GRO J0422+32 (i=55.6+-4.1) implies a BH mass of 2.7+0.7-0.5 Msun thus placing it within the gap that separates BHs from neutron stars. This result proves that low-mass BHs exist in nature and strongly suggests that the so-called "mass gap" is mainly produced by low number statistics and possibly observational biases. On the other hand, we find that Swift J1357-0933 contains a 10.9+1.7-1.6 Msun BH seen nearly edge on (i=87.4+2.6-5.6 deg). Such extreme inclination, however, should be treated with caution since it relies on extrapolating the T-i correlation beyond i>~75 deg, where it has not yet been tested.
