X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070

Abstract

MAXI J1820+070, a black hole candidate first detected in early March 2018, was observed by XMM-Newton during the outburst rise. In this letter we report on the spectral and timing analysis of the XMM-Newton X-ray and UV data, as well as contemporaneous X-ray data from the Swift satellite. The X-ray spectrum is well described by a hard thermal Comptonization continuum. The XMM-Newton X-ray light curve shows a pronounced dipping interval, and spectral analysis indicates that it is caused by a moderately ionized partial covering absorber. The XMM-Newton/OM U-filter data does not reveal any signs of the 17 hr orbital modulation that was seen later on during the outburst decay. The UV/X-ray cross correlation function shows a complex shape, with a peak at positive lags of about 4 seconds and a pre-cognition dip at negative lags, which is absent during the X-ray dipping episode. Such shape could arise if the UV emission comes partially from synchrotron self-Compton emission near the black hole, as well as from reprocessing of the X-rays in the colder accretion disc further out.

5 pages, 4 figures, MNRAS Letters, in press

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Cited by in corpus (31)

• 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
• 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
• A rapid change in X-ray variability and a jet ejection in the black hole transient MAXI J1820+070
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• Measuring fundamental jet properties with multi-wavelength fast timing of 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
• A Black Hole X-ray Binary at $\sim$100 Hz: Multiwavelength Timing of MAXI J1820+070 with HiPERCAM and NICER
• 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
• Physical origin of the nonphysical spin evolution of MAXI J1820+070
• The INTEGRAL view on Black Hole X-ray Binaries
• Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
• Dynamical confirmation of a stellar-mass black hole in the transient X-ray dipping binary MAXI J1305-704
• Estimating the size of X-ray lamppost coronae in active galactic nuclei
• A spectrally stratified hot accretion flow in the hard state of MAXI J1820+070
• The Evolution of Rapid Optical/X-ray Timing Correlations in the Initial Hard State of MAXI J1820+070
• Observations of the Disk/Jet Coupling of MAXI J1820+070 During its Descent to Quiescence
• Evidence for Disk Truncation at Low Accretion States of the Black Hole Binary MAXI J1820+070 Observed by NuSTAR and XMM-Newton
• The Donor of the Black-Hole X-Ray Binary MAXI J1820+070
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• A rapid optical and X-ray timing study of the neutron star X-ray binary Swift J1858.6-0814
• The inner flow geometry in MAXI J1820+070 during hard and hard-intermediate states
• Intermittent QPO properties of MAXI J1820+070 revealed by Insight-HXMT
• Investigating the consistency of the shape and flux of X-ray reflection spectra in the hard state with an accretion disk reaching close to the black hole
• Tracking the evolution of the accretion flow in MAXI J1820+070 during its hard state with the JED-SAD model
• X-ray time lag evaluation of MAXI J1820+070 with a differential cross-correlation analysis
• Large optical modulations during 2018 outburst of MAXI J1820+070 reveal evolution of warped accretion disc through X-ray state change
• Evolution of X-ray and optical rapid variability during the low/hard state in the 2018 outburst of MAXI J1820+070 = ASASSN-18ey