X-ray and Optical Monitoring of State Transitions in MAXI J1820+070

Abstract

We report results from the X-ray and optical monitoring of the black hole candidate MAXI J1820+070 (=ASSASN-18ey) over the entire period of its outburst from March to October 2018.In this outburst, the source exhibited two sets of `fast rise and slow decay'-type long-term flux variations. We found that the 1--100 keV luminosities at two peaks were almost the same, although a significant spectral softening was only seen in the second flux rise. This confirms that the state transition from the low/hard state to the high/soft state is not determined by the mass accretion rate alone. The X-ray spectrum was reproduced with the disk blackbody emission and its Comptonization, and the long-term spectral variations seen in this outburst were consistent with a disk truncation model. The Comptonization component, with a photon index of 1.5-1.9 and electron temperature of ~>40 keV, was dominant during the low/hard state periods, and its contribution rapidly decreased (increased) during the spectral softening (hardening). During the high/soft state period, in which the X-ray spectrum became dominated by the disk blackbody component, the inner disk radius was almost constant, suggesting that the standard disk was present down to the inner most stable circular orbit. The long-term evolution of optical and X-ray luminosities and their correlation suggest that the jets substantially contributed to the optical emission in the low/hard state, while they are quenched and the outer disk emission dominated the optical flux in the intermediate state and the high/soft state.

arXiv comment12 pages, 7 figures, ApJ in press

References in corpus (33)

• On the Absorption of X-rays in the Interstellar Medium
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Modelling the behaviour of accretion flows in X-ray binaries
• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
• The Swift/BAT Hard X-ray Transient Monitor
• Do X-ray Binary Spectral State Transition Luminosities Vary?
• A Simple Comptonization Model
• Global optical/infrared - X-ray correlations in X-ray binaries: quantifying disc and jet contributions
• High- and low-frequency quasi-periodic oscillations in the X-ray light curves of the black hole transient H1743-322
• Black hole-like hysteresis and accretion states in neutron star low mass X-ray binaries
• Reprocessing of X-rays in the outer accretion disc of the black hole binary XTE J1817--330
• Suzaku Results on Cygnus X-1 in the Low/Hard State
• Hot accretion flow in black hole binaries: a link connecting X-rays to the infrared
• Jet-disc coupling through a common energy reservoir in the black hole XTE J1118+480
• Gaia DR2 Distances and Peculiar Velocities for Galactic Black Hole Transients
• The infrared/X-ray correlation of GX 339-4: Probing hard X-ray emission in accreting black holes
• The Cool Accretion Disk in ESO 243-49 HLX-1: Further Evidence of an Intermediate Mass Black Hole
• Formation of Magnetically Supported Disks During Hard-to-Soft Transition in Black Hole Accretion Flows
• ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
• A mechanism for hysteresis in black hole binary state transitions
• The soft component and the iron line as signatures of the disc inner radius in Galactic black hole binaries
• X-Ray and Near-Infrared Observations of GX 339-4 in the Low/Hard State with Suzaku and IRSF
• Discovery of narrow X-ray absorption features from the low-mass X-ray binary X 1254-690 with XMM-Newton
• Studying the X-ray hysteresis in GX 339-4: the disc and iron line over one decade
• X-ray, Optical, and Near-infrared Monitoring of the New X-ray Transient MAXI J1820+070 in the Low/hard State
• MAXI GSC observations of a spectral state transition in the black hole candidate XTE J1752-223
• Discovery and state transitions of the new Galactic black hole candidate MAXI J1535-571
• Evolving optical polarisation of the black hole X-ray binary MAXI J1820+070
• Long-term Monitoring of the Black Hole Binary GX 339-4 in the High/Soft State during the 2010 Outburst with MAXI/GSC
• A new X-ray nova MAXI J1910-057 (= Swift J1910.2-0546) and mass-accretion inflow
• State Transitions of GRS 1739$-$278 in the 2014 Outburst

Cited by in corpus (57)

• An extremely powerful long-lived superluminal ejection from the black hole MAXI J1820+070
• Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT
• A radio parallax to the black hole X-ray binary MAXI J1820+070
• The binary mass ratio in the black hole transient MAXI J1820+070
• Dynamical confirmation of a black hole in MAXI J1820+070
• Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-Timing Analysis
• Hard-state accretion disk winds from black holes: the revealing case of MAXI J1820+070
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region?
• Relativistic X-ray jets from the black hole X-ray binary MAXI J1820+070
• The Varying Kinematics of Multiple Ejecta from the Black Hole X-ray Binary MAXI J1820+070
• Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070
• Estimating the black hole spin for the X-ray binary MAXI J1820+070
• Discovery of the black hole X-ray binary transient MAXIJ1348-630
• A Black Hole X-ray Binary at $\sim$100 Hz: Multiwavelength Timing of MAXI J1820+070 with HiPERCAM and NICER
• X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
• A timing study of MAXI J1820+070 based on Swift/XRT and NICER monitoring in 2018/19
• 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
• Jet Parameters in the Black-Hole X-Ray Binary MAXI J1820+070
• Physical origin of the nonphysical spin evolution of MAXI J1820+070
• The evolution of the broadband temporal features observed in the black-hole transient MAXI J1820+070 with Insight-HXMT
• MAXI J1820+070 X-ray spectral-timing reveals the nature of the accretion flow in black hole binaries
• The Changing-look Optical Wind of the Flaring X-ray Transient Swift J1858.6-0814
• Studying the Reflection Spectra of the New Black Hole X-ray Binary Candidate MAXI J1631-479 Observed by NuSTAR: A Variable Broad Iron Line Profile
• A spectrally stratified hot accretion flow in the hard state of 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
• The Evolution of Rapid Optical/X-ray Timing Correlations in the Initial Hard State of MAXI J1820+070
• Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
• Accretion geometry of the black hole binary MAXI J1820+070 probed by frequency-resolved spectroscopy
• The origin of optical emission lines in the soft state of X-ray binary outbursts: the case of MAXI J1820+070
• A Phase-resolved View of the Low-frequency Quasiperiodic Oscillations from the Black Hole Binary MAXI J1820+070
• Black holes: Timing and spectral properties and evolution
• Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
• The Donor of the Black-Hole X-Ray Binary MAXI J1820+070
• Low Frequency Quasi-periodic Oscillation in MAXI J1820+070: Revealing distinct Compton and Reflection Contributions
• Simultaneous detection of an intrinsic absorber and a compact jet emission in the X-ray binary IGR J17091-3624 during a hard accretion state
• The nature of an imaginary quasi-periodic oscillation in the soft-to-hard transition of MAXI J1820+070
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• Optical and near-infrared spectroscopy of the black hole transient 4U 1543-47 during its 2021 ultra-luminous state
• Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
• Optical and Ultraviolet Monitoring of the Black Hole X-ray Binary MAXI J1820+070/ASASSN-18ey for 18 Months
• Swift J1728.9-3613 is a black hole X-ray binary: spectral and timing study using NICER
• A Dependable Distance Estimator to Black Hole Low-Mass X-ray Binaries
• The origin of long soft lags and the nature of the hard-intermediate state in black hole binaries
• The inner flow geometry in MAXI J1820+070 during hard and hard-intermediate states
• Multiwavelength Observations of the Black Hole X-ray Binary MAXI J1820$+$070 in the Rebrightening Phase
• Intermittent QPO properties of MAXI J1820+070 revealed by Insight-HXMT
• About the accuracy of the relxill/relxill_nk models in view of the next generation of X-ray missions
• Evolution of Accretion Disk Structure of the Black Hole X-ray Binary MAXI J1820$+$070 during the Rebrightening Phase
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Tracking optical variability and outflows across the accretion states of the black hole transient MAXI J1820+070
• MAXI : Monitor of All-sky X-ray Image
• Optical and X-ray timing analysis of the 2018-2020 outburst and rebrightening of the black-hole transient MAXI J1820+070
• X-ray time lag evaluation of MAXI J1820+070 with a differential cross-correlation analysis
• Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey