OUP accepted manuscript
OUP accepted manuscript
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DOI：
10.1093/mnras/stac773
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发表时间：
2022
影响因子：
4.8
通讯作者：
中科院分区：
文献类型：
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作者：
利用finsight - hxmt、NICER和nustar3组覆盖1-120 keV波段的观测数据，研究了2018年黑洞瞬态爆发H 1743−322。通过我们的宽带x射线光谱模型，我们证实了源在长达一个月的爆发中一直处于低/硬状态，尽管它在峰值通量时变得稍微柔软。我们检测到Type-C准周期振荡（QPOs），并跟踪其性质的演变。在爆发的上升阶段，QPO频率从~ 0.1 Hz上升到~ 0.4 Hz，在下降阶段再次下降。连续x射线通量、幂律光子指数、QPO频率和QPO均方根振幅呈正相关。QPO振幅在软x射线波段略高（典型值为12 - 16%，而在硬x射线波段为8 - 10%）。我们的光谱时序结果揭示了低/硬状态下的初始上升阶段，这一阶段很少被监测到如此高的节奏、时间分辨率和宽带覆盖。结合光谱和时间特性，我们发现“失败”（仅为硬状态）和“成功”爆发遵循相同的初始演化轨迹，尽管前一类爆发从未达到过渡到较软（热主导）吸积状态的阈值。
We studied the 2018 outburst of the black hole transient H 1743 − 322 with a series ofInsight-HXMT, NICER, andNuSTARobservations, covering the 1–120 keV band. With our broad-band X-ray spectral modelling, we confirm that the source remained in the low/hard state throughout the month-long outburst, although it became marginally softer at peak flux. We detected Type-C quasi-periodic oscillations (QPOs) and followed the evolution of their properties. The QPO frequency increased from ∼0.1 to ∼0.4 Hz during the rising phase of the outburst and decreased again in the decline. Continuum X-ray flux, power-law photon index, QPO frequency, and QPO root-mean-square amplitude were positively correlated. The QPO amplitude was slightly higher in the soft X-ray band (typical values of 12–16 per cent, compared with 8–10 per cent in the hard band). Our spectral-timing results shed light on the initial rising phase in the low/hard state, which has rarely been monitored with such high cadence, time resolution, and broad-band coverage. Combining spectral and timing properties, we find that ‘failed’ (hard state only) and ‘successful’ outbursts follow the same initial evolutionary track, although the former class of outburst never reaches the threshold for a transition to softer (thermally dominated) accretion regimes.