论文标题
V404 CYGNI的同时X射线和光谱谱图支持X射线二元增生盘风的多相性质
Simultaneous X-ray and optical spectroscopy of V404 Cygni supports the multi-phase nature of X-ray binary accretion disc winds
论文作者
论文摘要
在X射线或光学波长的大量低质量X射线二进制物中发现了积聚盘风的观察性特征。 Black Hole Transient V404 Cygni的2015年爆发为研究同一系统中的两种流出提供了独特的机会。除硬X射线光曲线（积分）外，我们还使用了同时使用的X射线（Chandra天文台）和光学（Gran Telescopio Canarias，GTC）光谱。我们表明，在低硬X射线通量和发光耀斑期间的许多X射线转变中，在光学范围内检测到的风的动力学特性非常相似。此外，在中间硬X射线通量上严格同时获得的数据在光学和X射线发射线之间显示出一致的发射线特性，这很可能是在相同的积聚盘风中产生的。我们讨论了几种场景来解释风的特性，有利于在整个系统爆发期间存在动态多相流出的存在。这项研究以及在不同波长下具有相当相似特征速度的风探测器的数量越来越多，表明风型X射线二元流出本质上可能主要是多相。
Observational signatures of accretion disc winds have been found in a significant number of low-mass X-ray binaries at either X-ray or optical wavelengths. The 2015 outburst of the black hole transient V404 Cygni provided a unique opportunity for studying both types of outflows in the same system. We used contemporaneous X-ray (Chandra Observatory) and optical (Gran Telescopio Canarias, GTC) spectroscopy, in addition to hard X-ray light curves (INTEGRAL). We show that the kinetic properties of the wind, as derived from P-Cyg profiles detected in the optical range at low hard X-ray fluxes and in a number of X-ray transitions during luminous flares, are remarkably similar. Furthermore, strictly simultaneous data taken at intermediate hard X-ray fluxes show consistent emission line properties between the optical and the X-ray emission lines, which most likely arise in the same accretion disc wind. We discuss several scenarios to explain the properties of the wind, favouring the presence of a dynamic, multi-phase outflow during the entire outburst of the system. This study, together with the growing number of wind detections with fairly similar characteristic velocities at different wavelengths, suggest that wind-type X-ray binary outflows might be predominantly multi-phase in nature.
