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arXiv 2407.08421astro-ph.HE
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MAXI J1820+070 2018年爆发期间的X射线能谱与时序演化

X-ray spectral and timing evolution during the 2018 outburst of MAXI J1820+070

YaXing Li, Zhen Yan, ChenXu Gao, Wenfei Yu

AI总结:

利用$Insight$-HXMT和$NICER$观测研究MAXI J1820+070 2018年爆发的能谱与时序演化,发现HID独特环线源于反射成分演化,并揭示了QPO与Compton化过程的耦合及与喷流抛射的时间重合。

摘要:

我们利用$Insight$-HXMT和$NICER$的高频次观测,详细研究了黑洞X射线双星(BHXRB)MAXI J1820+070在2018年爆发期间的能谱与时序演化。其硬度-强度图(HID)呈现出一条包含所有谱态的“q”形轨迹,并在硬态中沿一个独特的环线演化。HID中观测到的轨迹可以通过负责Compton和反射辐射的成分演化来预测。X射线光度$L_\mathrm{X}$与光子指数$Γ$之间的关系证实了这一点,该关系展现出类似HID的模式。反射成分的独特演化导致了硬态HID(以及$L_\mathrm{X}$--$Γ$平面)中的独特环线。此外,我们发现C型准周期振荡(QPO)频率($ν_{\mathrm{C,QPO}}$)与Compton辐射的光学深度($τ$)呈负相关,而$ν_{\mathrm{C,QPO}}$与$Γ$呈正相关。这些相关性强烈表明QPO特性与产生Compton化的底层物理过程之间存在耦合。我们还发现,最后一次C型QPO探测与瞬变喷流抛射在1小时的时间尺度内重合。

英文摘要:

We made use high-cadence observations from the $Insight$-HXMT and $NICER$ to scrutinize the spectral and timing evolution during the 2018 outburst of the black hole X-ray binary (BHXRB) MAXI J1820+070. It's hardness-intensity diagram (HID) displays a ``q''-like track including all the spectral states, along a unique loop in the hard state. The tracks observed in the HID is anticipated in the evolution of the components responsible for Compton and reflection emission. This is substantiated by the relationship between the X-ray luminosity $L_\mathrm{X}$ and photon index $Γ$ which exhibits a pattern reminiscent of HID. The distinctive evolution of the reflection component leads to the unique loop in the HID (also in the $L_\mathrm{X}$--$Γ$ plane) of hard state. Additionally, we found a negative correlation between frequency of the type-C quasi-periodic oscillation (QPO) ($ν_{\mathrm{C,QPO}}$) and the optical depth of the Compton emission ($τ$), and a positive correlation between $ν_{\mathrm{C,QPO}}$ and $Γ$. These correlations strongly suggest a coupling between the QPO properties and the underlying process responsible for Comptonization. We also found that the last detection of type-C QPO coincide with the transient jet ejection within a timescale of one hour.

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