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arXiv 2203.01372astro-ph.HEastro-ph.SR
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吸积中子星双星瞬变的持续紫外流出

A persistent ultraviolet outflow from an accreting neutron star binary transient

N. Castro Segura, C. Knigge, K. S. Long, D. Altamirano, M. Armas Padilla, C. Bailyn, D. A. H. Buckley, D. J. K. Buisson, J. Casares, P. Charles, J. A. Combi, V.… 展开作者

N. Castro Segura, C. Knigge, K. S. Long, D. Altamirano, M. Armas Padilla, C. Bailyn, D. A. H. Buckley, D. J. K. Buisson, J. Casares, P. Charles, J. A. Combi, V. A. Cúneo, N. D. Degenaar, S. del Palacio, M. Díaz Trigo, R. Fender, P. Gandhi, M. Georganti, C. Gutiérrez, J. V. Hernandez Santisteban, F. Jiménez-Ibarra, J. Matthews, M. Méndez, M. Middleton, T. Muñoz-Darias, M. Özbey Arabacı, M. Pahari, L. Rhodes, T. D. Russell, S. Scaringi, J. van den Eijnden, G. Vasilopoulos, F. M. Vincentelli, P. Wiseman

摘要:

所有吸积盘的天体都会产生强大的外流。在包含中子星(NS)或黑洞的双星中,吸积经常发生在剧烈的爆发期间。在这些爆发的主要盘风签名是蓝移的X射线吸收线,这是优先看到盘为主的“软状态”。相比之下,光学风形成的线最近被发现在“硬态”,当一个热日冕主导的光度。这些特征之间的关系尚不清楚,尽管在紫外线(UV)区域有许多强烈的共振跃迁,但还没有爆发系统揭示出X射线和光学波段之间的风形成的线。在这里,我们表明,瞬态NS二进制斯威夫特J1858.6-0814表现出风形成,蓝移吸收与C IV,N V和He II在时间分辨紫外光谱在发光硬态。这是第一次有证据表明,在这种状态下,有一个温暖的、中等电离的外流成分。同时观察到的光学线也显示瞬态蓝移吸收。将紫外数据分解为常数和变量分量,蓝移吸收与前者相关。这意味着外流与数据中的发光耀斑无关。联合存在的紫外线和光学风的功能揭示了一个多相和/或分层流出的外盘。辐射流体动力学模拟已经预测了所有吸积状态的这种持续质量损失,并有助于解释短于预期的爆发持续时间。

英文摘要:

All disc-accreting astrophysical objects produce powerful outflows. In binaries containing neutron stars (NS) or black holes, accretion often takes place during violent outbursts. The main disc wind signatures during these eruptions are blue-shifted X-ray absorption lines, which are preferentially seen in disc-dominated "soft states". By contrast,optical wind-formed lines have recently been detected in "hard states", when a hot corona dominates the luminosity. The relationship between these signatures is unknown, and no erupting system has revealed wind-formed lines between the X-ray and optical bands yet, despite the many strong resonance transitions in this ultraviolet (UV) region. Here, we show that the transient NS binary Swift J1858.6-0814 exhibits wind-formed, blue-shifted absorption associated with C IV, N V and He II in time-resolved UV spectroscopy during a luminous hard state. This represents the first evidence for a warm, moderately ionized outflow component in this state. Simultaneously observed optical lines also display transient blue-shifted absorption. Decomposing the UV data into constant and variable components, the blue-shifted absorption is associated with the former. This implies that the outflow is not connect to the luminous flares in the data. The joint presence of UV and optical wind features reveals a multi-phase and/or stratified outflow from the outer disc. This type of persistent mass loss across all accretion states has been predicted by radiation-hydrodynamic simulations and helps to explain the shorter-than-expected outbursts duration.

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