A Rapid and Large-Amplitude X-ray Dimming Event in a z ~ 2.6 Radio-Quiet Quasar

Abstract

We report a dramatic fast X-ray dimming event in a z=2.627 radio-quiet type 1 quasar, which has an estimated supermassive black hole (SMBH) mass of $6.3\times 10^9{M}_{\odot }$. In the high X-ray state, it showed a typical level of X-ray emission relative to its UV/optical emission. Then its 0.5-2 keV (rest-frame 1.8-7.3 keV) flux dropped by a factor of $\approx 7.6$ within two rest-frame days. The dimming is associated with spectral hardening, as the 2-7 keV (rest-frame 7.3-25.4 keV) flux dropped by only $17\%$ and the effective power-law photon index of the X-ray spectrum changed from $\approx 2.3$ to $\approx 0.9$. The quasar has an infrared (IR)-to-UV spectral energy distribution and a rest-frame UV spectrum similar to those of typical quasars, and it does not show any significant long-term variability in the IR and UV/optical bands. Such an extremely fast and large-amplitude X-ray variability event has not been reported before in luminous quasars with such massive SMBHs. The X-ray dimming is best explained by a fast-moving absorber crossing the line of sight and fully covering the X-ray emitting corona. Adopting a conservatively small size of $5G{M}_{\mathrm{BH}}/c^2$ for the X-ray corona, the transverse velocity of the absorber is estimated to be $\approx 0.9c$. The quasar is likely accreting with a high or even super-Eddington accretion rate, and the high-velocity X-ray absorber is probably related to a powerful accretion-disk wind. Such an energetic wind may eventually evolve into a massive galactic-scale outflow, providing efficient feedback to the host galaxy.

arXiv comment16 pages, 6 figures, accepted for publication in ApJ

References in corpus (66)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• A Catalog of Quasar Properties from SDSS DR7
• First Results from the Catalina Real-time Transient Survey
• Initial Performance of the NEOWISE Reactivation Mission
• An ultra-luminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30
• Powerful Outflows and Feedback from Active Galactic Nuclei
• Evidence for ultra-fast outflows in radio-quiet AGNs: I - detection and statistical incidence of Fe K-shell absorption lines
• A Wavelet-Based Algorithm for the Spatial Analysis of Poisson Data
• Quasar Feedback: More Bang for Your Buck
• The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
• The Discovery of the First "Changing Look" Quasar: New Insights into the Physics & Phenomenology of AGN
• The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in XMM-COSMOS
• Bayesian Estimation of Hardness Ratios: Modeling and Computations
• Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
• Chandra Detects Relativistic Broad Absorption Lines from APM 08279+5255
• The Hard X-ray Spectrum as a Probe for Black-Hole Growth in Radio-Quiet Active Galactic Nuclei
• Improved redshifts for SDSS quasar spectra
• The Suzaku view of highly-ionised outflows in AGN: I - Statistical detection and global absorber properties
• Super-Eddington Accretion Disks around Supermassive black Holes
• Soft X-ray and Ultraviolet Emission Relations in Optically Selected AGN Samples
• The tight relation between X-ray and ultraviolet luminosity of quasars
• The Sizes of the X-ray and Optical Emission Regions of RXJ1131-1231
• X-ray Quasi-Periodic Eruptions from two previously quiescent galaxies
• XMM-NEWTON Reveals the Quasar Outflow in PG 1115+080
• Feedback from Mass Outflows in Nearby Active Galactic Nuclei I. UV and X-ray Absorbers
• Normalizing a Relativistic Model of X-ray Reflection: The Definition of the Reflection Fraction and its Implementation in relxill
• Mean Spectral Energy Distributions and Bolometric Corrections for Luminous Quasars
• Cosmic Evolution of Mass Accretion Rate and Metalicity in Active Galactic Nuclei
• X-ray Insights into the Nature of PHL 1811 Analogs and Weak Emission-Line Quasars: Unification with a Geometrically Thick Accretion Disk?
• A global view of the inner accretion and ejection flow around super massive black holes: radiation driven accretion disk winds in a physical context
• On the size and location of the X-ray emitting coronae around black holes
• 1H0707-495 in 2011: An X-ray source within a gravitational radius of the event horizon
• Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey Quasars
• Long XMM observation of the Narrow-Line Seyfert 1 galaxy IRAS13224-3809: rapid variability, high spin and a soft lag
• The Demographics of Broad-Line Quasars in the Mass-Luminosity Plane. I. Testing FWHM-Based Virial Black Hole Masses
• Further Evidence that Quasar X-Ray Emitting Regions Are Compact: X-Ray and Optical Microlensing in the Lensed Quasar Q J0158-4325
• ROSAT HRI Monitoring of Extreme X-ray Variability in the Narrow-Line Quasar PHL 1092
• A disk wind interpretation of the strong Fe Kα features in 1H 0707-495
• Long-Term X-ray Variability of Typical Active Galactic Nuclei in the Distant Universe
• Short term X-ray spectral variability of the quasar PDS 456 observed in a low flux state
• On the Observational Difference Between the Accretion Disk-Corona Connections among Super- and Sub-Eddington Accreting Active Galactic Nuclei
• The X-Ray Variability of a Large, Serendipitous Sample of Spectroscopic Quasars
• Discovery of Probable Relativistic Fe Emission and Absorption in the Cloverleaf Quasar H 1413+117
• Connecting the X-ray properties of weak-line and typical quasars: testing for a geometrically thick accretion disk
• Insights on the X-ray weak quasar phenomenon from XMM-Newton monitoring of PHL 1092
• Clumpy AGN outflows due to thermal instability
• Radiation Hydrodynamic Instability in Plane-Parallel, Super-Eddington Atmosphere: A Mechanism for Clump Formation
• The frequency of extreme X-ray variability of radio-quiet quasars
• Extreme ultra-soft X-ray variability in an eROSITA observation of the Narrow-Line Seyfert 1 Galaxy 1H 0707-495
• Exploratory X-ray Monitoring of Luminous Radio-Quiet Quasars at High Redshift: Initial Results
• Using principal component analysis to understand the variability of PDS 456
• An Extreme X-ray Variability Event of a Weak-Line Quasar
• Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
• The Wide-Angle Outflow of the Lensed z = 1.51 AGN HS 0810+2554
• SDSS J075101.42+291419.1: A Super-Eddington Accreting Quasar with Extreme X-ray Variability
• Synthetic absorption lines for a clumpy medium: a spectral signature for cloud acceleration in AGN?
• Yet another UFO in the X-ray spectrum of a high-z lensed QSO
• The Frequency of Intrinsic X-ray Weakness Among Broad Absorption Line Quasars
• The X-ray Variability of AGN and its Implications for Observations of Galaxy Clusters

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