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arXiv 1503.08874astro-ph.HE
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黑洞候选者Swift J1357 .2-0933在静止期的VLT光谱学

VLT spectroscopy of the Black Hole Candidate Swift J1357.2-0933 in Quiescence

M. A. P. Torres, P. G. Jonker, J. C. A. Miller-Jones, D. Steeghs, S. Repetto, Jianfeng Wu

摘要:

我们提出了时间分辨光谱的对应物的高倾角黑洞低质量X射线双星Swift J1357.2-0933在安静。没有探测到质量供体恒星的吸收特征。相反,光谱显示出突出的宽双峰Halpha发射和较弱的HeI发射线。从H α峰到峰的分离,我们将施主星的径向速度半振幅限制为> 789 km/s。通过径向速度和等效宽度测量的进一步分析表明,H α线是免费的变化,由于S波分量或盘食。从我们的数据和以前的观测在爆发,我们得出结论,长期的径向速度变化归因于一个旋进盘是低振幅或不存在。这意味着该线的质心位置应该接近地代表系统径向速度。利用导出的系统速度为-150 km/s和源距离的最佳可用限制,我们推断黑洞正在其当前的银河系轨道上向平面移动,除非自行是实质性的。最后,双峰剖面的中心吸收深度增加了对雨燕J1357.2-0933作为高倾角系统的支持。另一方面,我们认为,从X射线拟合推断出的低氢柱密度表明,该系统是没有看到的边缘。

英文摘要:

We present time-resolved optical spectroscopy of the counterpart to the high-inclination black hole low-mass X-ray binary Swift J1357.2-0933 in quiescence. Absorption features from the mass donor star were not detected. Instead the spectra display prominent broad double-peaked Halpha emission and weaker HeI emission lines. From the Halpha peak-to-peak separation we constrain the radial velocity semi-amplitude of the donor star to > 789 km/s. Further analysis through radial velocity and equivalent width measurements indicates that the Halpha line is free of variability due to S-wave components or disc eclipses. From our data and previous observations during outburst, we conclude that long-term radial velocity changes ascribed to a precessing disc were of low amplitude or not present. This implies that the centroid position of the line should closely represent the systemic radial velocity. Using the derived systemic velocity of -150 km/s and the best available limits on the source distance, we infer that the black hole is moving towards the Plane in its current Galactic orbit unless the proper motion is substantial. Finally, the depth of the central absorption in the double peaked profiles adds support for Swift J1357.2-0933 as a high-inclination system. On the other hand, we argue that the low hydrogen column density inferred from X-ray fitting suggests that the system is not seen edge-on.

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