NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348-630
NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348-630
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NICER 揭示了候选黑洞 MAXI J1348-630 中 B 型准周期振荡的瞬态性质
DOI：
10.1093/mnras/stab1553
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发表时间：
2021
影响因子：
4.8
通讯作者：
Basak A.
中科院分区：
文献类型：
--
作者：
Zhang L.;Altamirano D.;Uttley P.;Garcia F.;Mendez M.;Homan J.;Steiner J. F.;Alabarta K.;Buisson D. J. K.;Remillard R. A.;Gendreau K. C.;Arzoumanian Z.;Markwardt C.;Strohmayer T. E.;Neilsen J.;Basak A.
我们对MAXI J1348−630的四次中子星内部成分探测器（NICER）观测中观测到的b型准周期振荡（QPO）的快速出现/消失进行了系统的光谱时序分析。通过比较有b型QPO和没有b型QPO的周期光谱，我们发现主要的差异出现在~ 2 keV以上的能带上，表明QPO的发射主要是硬复化化成分。在过渡期间，观察到圆盘和复合发射的相对贡献发生了变化。从非QPO到b型QPO，圆盘通量减少，复合通量增加。然而，总通量在nicerband中变化不大。我们的研究结果表明，b型QPO与盘和复合发射之间吸积力的重新分配有关。当b型QPO出现时，更多的吸积能量耗散到复合体区，而不是盘内。我们的光谱拟合提示，增加的复合辐射可能来自与喷流底部有关的额外成分。
We present a systematic spectral-timing analysis of a fast appearance/disappearance of a type-B quasi-periodic oscillation (QPO), observed in fourNeutron Star Interior Composition Explorer(NICER) observations of MAXI J1348−630. By comparing the spectra of the period with and without the type-B QPO, we found that the main difference appears at energy bands above ∼2 keV, suggesting that the QPO emission is dominated by the hard Comptonized component. During the transition, a change in the relative contribution of the disc and Comptonized emission was observed. The disc flux decreased while the Comptonized flux increased from non-QPO to type-B QPO. However, the total flux did not change too much in theNICERband. Our results reveal that the type-B QPO is associated with a redistribution of accretion power between the disc and Comptonized emission. When the type-B QPO appears, more accretion power is dissipated into the Comptonized region than in the disc. Our spectral fits give a hint that the increased Comptonized emission may come from an additional component that is related to the base of the jet.