用Insight-HXMT随访观测来限制FRB180916.J0158+65的瞬态高能活性

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用Insight-HXMT随访观测来限制FRB180916.J0158+65的瞬态高能活性

Constraining the transient high-energy activity of FRB180916.J0158+65 with Insight-HXMT followup observations

论文作者

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

磁铁与快速无线电爆发（FRB）源之间的联系终于建立了。在这种情况下，一个空旷的问题之一是/哪些额外的银河系源是否能展示X/Gamma-ray爆发，以及它是否与无线电活动相关。我们旨在通过在一系列的时间尺度和能量上寻找与与外乳乳仪外磁盘有强大的耀斑相兼容的爆发，从而限制可能在广泛能源范围内已知的最近众所周知的最近已知的X/Gamma-ray爆发活性。在2月4日至7日，在2月4日至7日的活动阶段，我们跟踪了仅149 MPC距离的最接近的近来外层次FRB源，即定期中继器FRB180916.J0158+65，带有Insight-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard-Hard的X射线调制望远镜（HXMT）。利用宽带，大有效区域和几个独立检测器的组合，我们使用敏感算法在一组时间尺度上从1 ms到1.024 s进行了爆发，这些算法先前已被表征和优化。此外，通过模拟，我们研究了一组合成耀斑的释放能量持续相空间中技术的灵敏度，并假设具有不同的能量光谱。我们将1-100 keV能带中耀斑的可能发生在<10^46 erg的持续时间<10^46 ERG上<0.1 s。我们可以排除与在少数银河磁铁情况下观察到的巨型耀斑的发生。在我们的观察过程中没有报告的无线电活动不允许我们就可能同时高能排放的任何陈述做出任何陈述。

A link between magnetars and fast radio burst (FRB) sources has finally been established. In this context, one of the open issues is whether/which sources of extra galactic FRBs exhibit X/gamma-ray outbursts and whether it is correlated with radio activity. We aim to constrain possible X/gamma-ray burst activity from one of the nearest extragalactic FRB sources currently known over a broad energy range, by looking for bursts over a range of timescales and energies that are compatible with being powerful flares from extragalactic magnetars. We followed up the as-yet nearest extragalactic FRB source at a mere 149 Mpc distance, the periodic repeater FRB180916.J0158+65, during the active phase on February 4-7, 2020, with the Insight-Hard X-ray Modulation Telescope (HXMT). Taking advantage of the combination of broad band, large effective area, and several independent detectors available, we searched for bursts over a set of timescales from 1 ms to 1.024 s with a sensitive algorithm, that had previously been characterised and optimised. Moreover, through simulations we studied the sensitivity of our technique in the released energy-duration phase space for a set of synthetic flares and assuming different energy spectra. We constrain the possible occurrence of flares in the 1-100 keV energy band to E<10^46 erg for durations <0.1 s over several tens of ks exposure. We can rule out the occurrence of giant flares similar to the ones that were observed in the few cases of Galactic magnetars. The absence of reported radio activity during our observations does not allow us to make any statements on the possible simultaneous high-energy emission.

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