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arXiv 2103.04601astro-ph.HE
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沿一个X射线双星爆发的预期盘风性质演化

Expected disk wind properties evolution along an X-ray Binary outburst

P. -O. Petrucci, S. Bianchi, G. Ponti, J. Ferreira, G. Marcel, F. Cangemi, S. Chakravorty, M. Clavel, J. Malzac, J. Rodriguez, S. Barnier, R. Belmont, S. Corbel… 展开作者

P. -O. Petrucci, S. Bianchi, G. Ponti, J. Ferreira, G. Marcel, F. Cangemi, S. Chakravorty, M. Clavel, J. Malzac, J. Rodriguez, S. Barnier, R. Belmont, S. Corbel, M. Coriat, G. Henri

摘要:

蓝移的X射线吸收线(优先来自6-8 keV范围内的Fe XXV和Fe XXVI)表明黑洞(BH)X射线双星(XrB)中存在大质量的热盘风,这在软态期间最常见。最近有人提出,在硬态中未检测到这种热风特征可能是由于与Fe XXV和Fe XXVI一致的电离域中的风的热不稳定性。然而,研究风的热稳定性需要一个非常好的知识的电离能谱分布(SED)的频谱形状。本文利用GX 339-4在2010-2011年爆发期间的RXTE观测结果,讨论了整个爆发期间盘风性质的预期演变。虽然GX 339-4从未在X射线中显示出热风的特征,但所使用的数据集最适合说明我们的目的。我们计算相应的稳定性曲线的风使用SED得到的喷射盘模型。我们发现,盘风可以从稳定过渡到不稳定状态的Fe XXV和Fe XXVI离子在一天的时间尺度。虽然在硬态下没有风吸收特征可以通过这种不稳定性来解释,但它们在软态下的存在似乎需要在硬态和软态之间的光谱转换期间改变风的特性(例如密度)。我们认为,这些变化可能部分是由于通过中心X射线源的照射在吸积盘表面的加热功率释放的变化。本文讨论的盘风性质的演变可以通过对高倾角BH XrB光谱跃迁的日常监测得到证实。

英文摘要:

Blueshifted X-ray absorption lines (preferentially from Fe XXV and Fe XXVI present in the 6-8 keV range) indicating the presence of massive hot disk winds in Black Hole (BH) X-ray binaries (XrB) are most generally observed during the soft states. It has been recently suggested that the non-detection of such hot wind signatures in the hard states could be due to the thermal instability of the wind in the ionisation domain consistent with Fe XXV and Fe XXVI. Studying the wind thermal stability requires however a very good knowledge of the spectral shape of the ionizing Spectral Energy Distribution (SED). We discuss in this paper the expected evolution of the disk wind properties during an entire outburst by using the RXTE observations of GX 339-4 during its 2010-2011 outburst. While GX 339-4 never showed signatures of a hot wind in the X-rays, the dataset used is optimal to illustrate our purposes. We compute the corresponding stability curves of the wind using the SED obtained with the Jet-Emitting Disk model. We show that the disk wind can transit from stable to unstable states for Fe XXV and Fe XXVI ions on a day time scale. While the absence of wind absorption features in hard states could be explained by this instability, their presence in soft states seems to require changes of the wind properties (e.g. density) during the spectral transitions between hard and soft states. We propose that these changes could be partly due to the variation of heating power release at the accretion disk surface through irradiation by the central X-ray source. The evolution of the disk wind properties discussed in this paper could be confirmed through the daily monitoring of the spectral transition of a high-inclination BH XrB.

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