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arXiv 2206.02461astro-ph.HE
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MAXI J1820 +070在爆发衰变和随后的小爆发期间的多波长观测

Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst

M. Özbey Arabacı, E. Kalemci, T. Dinçer, C. Bailyn, D. Altamirano, T. Ak

摘要:

我们提出了在2018年爆发的衰减期间对银河系黑洞X射线瞬变MAXI J1820 $+$ 070的准同时多波长观测结果及其随后在2019年3月的整个小型爆发。我们用唯象模型和康普顿化模型拟合了X射线谱,并与系统的多波长行为进行了比较,讨论了X射线谱的演化。在主爆发衰变期间软到硬转变后7天,该系统在UV/光学/NIR波段显示出重新变亮,而它在X射线和无线电中衰落。相比之下,小爆发发生在最初爆发衰变的硬态转变后165天,并在所有波长中被检测到。对于这两个事件,测量的时间尺度与在其他黑洞系统中观察到的时间尺度一致。同期的硬X射线/软$γ$ -射线观测表明,非热电子能量分布在开始的紫外/光学/近红外再亮,而热分布可以拟合的数据在硬迷你爆发活动。直到再亮的宽带光谱能量分布是一致的照射外吸积盘模型。然而,这两个SED产生的峰值的再亮和接近峰值的小型爆发提供了良好的配合,只有一个额外的幂律分量的UV/光学/NIR频率范围内,这往往是解释与喷源。

英文摘要:

We present results from quasi-simultaneous multiwavelength observations of the Galactic black hole X-ray transient MAXI J1820$+$070 during the decay of the 2018 outburst and its entire subsequent mini-outburst in March 2019. We fit the X-ray spectra with phenomenological and Comptonizaton models and discuss the X-ray spectral evolution comparing with the multiwavelength behaviour of the system. The system showed a rebrightening in UV/Optical/NIR bands 7-days after the soft-to-hard transition during the main outburst decay while it was fading in X-rays and radio. In contrast, the mini-outburst occurred 165-days after the hard state transition of the initial outburst decay and was detected in all wavelengths. For both events, the measured timescales are consistent with those observed in other black hole systems. Contemporaneous hard X-ray/soft $γ$-ray observations indicate a non-thermal electron energy distribution at the beginning of the UV/Optical/NIR rebrightening, whereas a thermal distribution can fit the data during the hard mini-outburst activity. The broadband spectral energy distributions until the rebrightening are consistent with the irradiated outer accretion disc model. However, both the SEDs produced for the peak of rebrightening and close to the peak of mini-outburst provided good fits only with an additional power-law component in the UV/Optical/NIR frequency ranges which is often interpreted with a jet origin.

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