The evolution of the broadband temporal features observed in the black-hole transient MAXI J1820+070 with Insight-HXMT

Abstract

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.

arXiv commentAccepted for publication in ApJ

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• Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
• Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• The NICER "Reverberation Machine": A Systematic Study of Time Lags in Black Hole X-Ray Binaries
• The Varying Kinematics of Multiple Ejecta from the Black Hole X-ray Binary MAXI J1820+070
• A variable corona during the transition from type-C to type-B quasi-periodic oscillations in the black hole X-ray binary MAXI J1820+070
• Physical origin of the nonphysical spin evolution of MAXI J1820+070
• Variability and phase lags of the type-C quasi-periodic oscillation of MAXI J1348-630 with NICER
• Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
• A variable ionized disk wind in the black-hole candidate EXO 1846-031
• MAXI J1820+070 X-ray spectral-timing reveals the nature of the accretion flow in black hole binaries
• Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• A detailed view of low-frequency quasi-periodic oscillation in the broadband 0.2-200 keV with Insight-HXMT and NICER
• Chasing the break: Tracing the full evolution of a black hole X-ray binary jet with multi-wavelength spectral modeling
• Insight-HXMT Study of the Inner Accretion Disk in the Black Hole Candidate EXO 1846--031
• The accretion flow geometry of MAXI J1820+070 through broadband noise research with Insight-HXMT
• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• A broadband spectral-timing study of QPOs in the bright black hole X-ray binary Swift J1727.8-1613
• A possible overall scenario for the outburst evolution of MAXI J1820+070 revealed by Insight-HXMT
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• The inner flow geometry in MAXI J1820+070 during hard and hard-intermediate states
• Evidence for a dynamic corona in the short-term time lags of black hole X-ray binary MAXI J1820+070
• Reverberation lags viewed in hard X-rays from an accreting stellar-mass black hole
• Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey
• Large optical modulations during 2018 outburst of MAXI J1820+070 reveal evolution of warped accretion disc through X-ray state change