A Rapid Change in X-Ray Variability and a Jet Ejection in the Black Hole Transient MAXI J1820+070
A Rapid Change in X-Ray Variability and a Jet Ejection in the Black Hole Transient MAXI J1820+070
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DOI：
10.3847/2041-8213/ab7932
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发表时间：
2020-03
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通讯作者：
J. Homan;J. Bright;S. Motta;D. Altamirano;Z. Arzoumanian;A. Basak;T. Belloni;E. Cackett;R. Fender;K. Gendreau;E. Kara;D. Pasham;R. Remillard;J. Steiner;A. Stevens;P. Uttley
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作者：
J. Homan;J. Bright;S. Motta;D. Altamirano;Z. Arzoumanian;A. Basak;T. Belloni;E. Cackett;R. Fender;K. Gendreau;E. Kara;D. Pasham;R. Remillard;J. Steiner;A. Stevens;P. Uttley
我们目前的中子星星内部成分探测器X射线和弧分钟微开尔文成像仪大阵列无线电观测的一个快速的硬到软的状态过渡的黑洞X射线瞬态MAXI J1820+070。在从硬态到软态的过渡期间，在X射线功率密度谱中看到两种特定类型的准周期振荡（QPO）之间的切换，从C型到B型，沿着在7-12 keV频带中的宽带X射线可变性的强度下降和短暂的耀斑。在这个转换之后不久（2.2 -2.5小时），观测到一个强烈的射电耀斑，对应于超光速喷出物的发射。虽然在其他黑洞X射线瞬变中已经发现了QPO跃迁和射电耀斑之间存在联系的迹象，但我们的观测结果构成了迄今为止最强有力的观测证据，证明了B型QPO的出现与离散喷流喷射的发射之间存在联系。
We present Neutron Star Interior Composition Explorer X-ray and Arcminute Microkelvin Imager Large Array radio observations of a rapid hard-to-soft state transition in the black hole X-ray transient MAXI J1820+070. During the transition from the hard state to the soft state a switch between two particular types of quasiperiodic oscillations (QPOs) was seen in the X-ray power density spectra, from type-C to type-B, along with a drop in the strength of the broadband X-ray variability and a brief flare in the 7–12 keV band. Soon after this switch (∼2–2.5 hr) a strong radio flare was observed that corresponded to the launch of superluminal ejecta. Although hints of a connection between QPO transitions and radio flares have been seen in other black hole X-ray transients, our observations constitute the strongest observational evidence to date for a link between the appearance of type-B QPOs and the launch of discrete jet ejections.