A spectrally stratified hot accretion flow in the hard state of MAXI J1820+070

Abstract

We study the structure of the accretion flow in the hard state of the black-hole X-ray binary MAXI~J1820+070 with \nicer data. The power spectra show broadband variability which can be fit with four Lorentzian components peaking at different time scales. Extracting power spectra as a function of energy enables the energy spectra of these different power spectral components to be reconstructed. We found significant spectral differences among Lorentzians, with the one corresponding to the shortest variability time scales displaying the hardest spectrum. Both the variability spectra and the time-averaged spectrum are well-modelled by a disc blackbody and thermal Comptonization, but the presence of (at least) two Comptonization zones with different temperatures and optical depths is required. The disc blackbody component is highly variable, but only in the variability components peaking at the longest time scales ($\gsim1$ s). The seed photons for the spectrally harder zone come predominantly from the softer Comptonization zone. Our results require the accretion flow in this source to be structured, and cannot be described by a single Comptonization region upscattering disc blackbody photons, and reflection from the disc.

accepted to MNRAS

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Cited by in corpus (18)

• A full spectral-timing model to map the accretion flow in black hole binaries: the low/hard state of 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
• Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• A timing-based estimate of the spin of the black hole in MAXI J1820+070
• Chasing the break: Tracing the full evolution of a black hole X-ray binary jet with multi-wavelength spectral modeling
• Burst-Disk Interaction in 4U 1636-536 as observed by NICER
• Accretion geometry of the black hole binary MAXI J1820+070 probed by frequency-resolved spectroscopy
• 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
• Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
• An Insight-HXMT view of the mHz quasi-regular modulation phenomenon in the black hole X-ray binary 4U 1630-47
• 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
• Intermittent QPO properties of MAXI J1820+070 revealed by Insight-HXMT
• Broad-band noises in GX 339-4 during the 2021 outburst observed with Insight-HXMT and NICER
• Tracking the evolution of the accretion flow in MAXI J1820+070 during its hard state with the JED-SAD model
• Optical and X-ray timing analysis of the 2018-2020 outburst and rebrightening of the black-hole transient MAXI J1820+070