The evolution of the broadband temporal features observed in the black-hole transient MAXI J1820+070 with Insight-HXMT
Creators: name: Wang, Yanan
name: Ji, Long
name: Zhang, S. N.
name: Méndez, Mariano
name: Qu, J. L.
name: Maggi, Pierre
name: Ge, M. Y.
name: Qiao, Erlin
name: Tao, L.
name: Zhang, S.
name: Altamirano, Diego
name: Zhang, L.
name: Ma, X.
name: Lu, F. J.
name: Li, T. P.
name: Huang, Y.
name: Zheng, S. J.
name: Chen, Y. P.
name: Chang, Z.
name: Tuo, Y. L.
name: Gungor, C.
name: Song, L. M.
name: Xu, Y. P.
name: Cao, X. L.
name: Chen, Y.
name: Liu, C. Z.
name: Bu, Q. C.
name: Cai, C.
name: Chen, G.
name: Chen, L.
name: Chen, T. X.
name: Chen, Y. B.
name: Cui, W.
name: Cui, W. W.
name: Deng, J. K.
name: Dong, Y. W.
name: Du, Y. Y.
name: Fu, M. X.
name: Gao, G. H.
name: Gao, H.
name: Gao, M.
name: Gu, Y. D.
name: Guan, J.
name: Guo, C. C.
name: Han, D. W.
name: Huo, J.
name: Jia, S. M.
name: Jiang, L. H.
name: Jiang, W. C.
name: Jin, J.
name: Jin, Y. J.
name: Kong, L. D.
name: Li, B.
name: Li, C. K.
name: Li, G.
name: Li, M. S.
name: Li, W.
name: Li, X.
name: Li, X. B.
name: Li, X. F.
name: Li, Y. G.
name: Li, Z. W.
name: Liang, X. H.
name: Liao, J. Y.
name: Liu, G. Q.
name: Liu, H. W.
name: Liu, X. J.
name: Liu, Y. N.
name: Lu, B.
name: Lu, X. F.
name: Luo, Q.
name: Luo, T.
name: Meng, B.
name: Nang, Y.
name: Nie, J. Y.
name: Ou, G.
name: Sai, N.
name: Shang, R. C.
name: Song, X. Y.
name: Sun, L.
name: Tan, Y.
name: Wang, G. F.
name: Wang, J.
name: Wang, W. S.
name: Wang, Y. D.
name: Wang, Y. S.
name: Wen, X. Y.
name: Wu, B. B.
name: Wu, B. Y.
name: Wu, M.
name: Xiao, G. C.
name: Xiao, S.
name: Xiong, S. L.
name: Yang, J. W.
name: Yang, S.
name: Yang, Y. J.
name: Yi, Q. B.
name: Yin, Q. Q.
name: You, Y.
name: Zhang, A. M.
name: Zhang, C. M.
name: Zhang, F.
name: Zhang, H. M.
name: Zhang, J.
name: Zhang, T.
name: Zhang, W. C.
name: Zhang, W.
name: Zhang, W. Z.
name: Zhang, Y.
name: Zhang, Y. F.
name: Zhang, Y. J.
name: Zhang, Y.
name: Zhang, Z.
name: Zhang, Z. L.
name: Zhao, H. S.
name: Zhao, X. F.
name: Zhou, D. K.
name: Zhou, J. F.
name: Zhuang, R. L.
name: Zhu, Y. X.
name: Zhu, Y.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We study the evolution of the temporal properties of MAXI 1820+070 during the 2018 outburst in its hard state from MJD 58190 to 58289 with Insight-HXMT in a broad energy band 1-150 keV. We find different behaviors of the hardness ratio, the fractional rms and time lag before and after MJD 58257, suggesting a transition occurred at around this point. The observed time lags between the soft photons in the 1-5 keV band and the hard photons in higher energy bands, up to 150 keV, are frequency-dependent: the time lags in the low-frequency range, 2-10 mHz, are both soft and hard lags with a timescale of dozens of seconds but without a clear trend along the outburst; the time lags in the high-frequency range, 1-10 Hz, are only hard lags with a timescale of tens of milliseconds; first increase until around MJD 58257 and decrease after this date. The high-frequency time lags are significantly correlated to the photon index derived from the fit to the quasi-simultaneous NICER spectrum in the 1-10 keV band. This result is qualitatively consistent with a model in which the high-frequency time lags are produced by Comptonization in a jet.
description: Accepted for publication in ApJ