在巨大的GRS爆发期间，洞察力HXMT观察可能从射流到风中占主导状态的快速过渡〜1915+105

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在巨大的GRS爆发期间，洞察力HXMT观察可能从射流到风中占主导状态的快速过渡〜1915+105

Insight-HXMT observations of a possible fast transition from jet to wind dominated state during a huge flare of GRS~1915+105

论文作者

Kong, L. D., Zhang, S., Chen, Y. P., Zhang, S. N., Ji, L., Wang, P. J., Tao, L., Ge, M. Y., Liu, C. Z., Song, L. M., Lu, F. J., Qu, J. L., Li, T. P., Xu, Y. P., Cao, X. L., Chen, Y., Bu, Q. C., Cai, C., Chang, Z., Chen, G., Chen, L., Chen, T. X., Cui, W. W., Du, Y. Y., Gao, G. H., Gao, H., Gao, M., Gu, Y. D., Guan, J., Guo, C. C., Han, D. W., Huang, Y., Huo, J., Jia, S. M., Jiang, W. C., Jin, J., Li, B., Li, C. K., Li, G., Li, W., Li, X., Li, X. B., Li, X. F., Li, Z. W., Liang, X. H., Liao, J. Y., Liu, B. S., Liu, H. W., Liu, H. X., Liu, X. J., Lu, X. F., Luo, Q., Luo, T., Ma, R. C., Ma, X., Meng, B., Nang, Y., Nie, J. Y., Ou, G., Ren, X. Q., Sai, N., Song, X. Y., Sun, L., Tan, Y., Tuo, Y. L., Wang, C., Wang, L. J., Wang, W. S., Wang, Y. S., Wen, X. Y., Wu, B. B., Wu, B. Y., Wu, M., Xiao, G. C., Xiao, S., Xiong, S. L., Yang, R. J., Yang, S., Yang, Y. J., Yang, Y. J., Yi, Q. B., Yin, Q. Q., You, Y., Zhang, F., Zhang, H. M., Zhang, J., Zhang, P., Zhang, W. C., Zhang, W., Zhang, Y. F., Zhang, Y. H., Zhao, H. S., Zhao, X. F., Zheng, S. J., Zheng, Y. G., Zhou, D. K.

论文摘要

我们介绍了在\ emph {Insight} -HMXT数据集中记录的最亮耀斑的分析，在不寻常的低亮度状态下，从微Quasar Grs 〜1915+105的广泛能量范围（2 $ -200 keV）。 \ emph {Insight} -hxmt在2019年6月2日UTC 16:37:06至20:11:36中检测到了这种耀斑，其2-200 kev luminosity为3.4 $ - $ - $ 7.27 $ \ times10 $ \ times10^{38} $ erg erg s $ s $^s $^{ - 1} $。在宽带光谱分析的基础上，我们发现耀斑光谱在明亮和微弱的时期显示出不同的行为。耀斑的光谱可以安装在幂律组件主导的模型中。其他组件出现在明亮的时代，上面有硬尾，在带有吸收线$ \ sim $ 6.78 kev的微弱时期中。后者的反射部分与内磁盘半径$ \ sim一致，$ \ sim $ 5倍，比前者大5倍。这些结果是在“不寻常”的低亮度状态期间的巨型耀斑上〜1915+105可能表明，源经历了从射流主导的状态到风为主导状态的可能快速过渡。我们推测，不断发展的积聚磁盘和大规模磁场可能在这种奇特的巨大耀斑中起重要作用。

We present the analysis of the brightest flare that was recorded in the \emph{Insight}-HMXT data set, in a broad energy range (2$-$200 keV) from the microquasar GRS~1915+105 during an unusual low-luminosity state. This flare was detected by \emph{Insight}-HXMT among a series of flares during 2 June 2019 UTC 16:37:06 to 20:11:36, with a 2-200 keV luminosity of 3.4$-$7.27$\times10^{38}$ erg s$^{-1}$. Basing on the broad-band spectral analysis, we find that the flare spectrum shows different behaviors during bright and faint epochs. The spectrum of the flare can be fitted with a model dominated by a power-law component. Additional components show up in the bright epoch with a hard tail and in the faint epoch with an absorption line $\sim$ 6.78 keV. The reflection component of the latter is consistent with an inner disk radius $\sim$ 5 times larger than that of the former. These results on the giant flare during the "unusual" low-luminosity state of GRS~1915+105 may suggest that the source experiences a possible fast transition from a jet-dominated state to a wind-dominated state. We speculate that the evolving accretion disk and the large-scale magnetic field may play important roles in this peculiar huge flare.

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