On the Origin of the Dramatic Spectral Variability of WPVS 007

Abstract

We report the discovery of large-amplitude mid-infrared variabilities (MIR; $\sim 0.3$ mag) in the Wide-field Infrared Survey Explorer W1 and W2 bands of the low-luminosity narrow-line Seyfert 1 galaxy WPVS 007, which exhibits prominent and varying broad-absorption lines (BALs) with blueshifted velocity up to $\sim 14000\mathrm{km}{\mathrm{s}}^{-1}$. The observed significant MIR variability, the UV to optical color variabilities in the Swift bands that deviate from the predictions of pure dust attenuation models, and the fact that Swift light curves can be well fitted by the stochastic AGN variability model suggest that its observed flux variabilities in UV-optical-MIR bands should be intrinsic, rather than owing to variable dust extinction. Furthermore, the variations of BAL features (i.e., trough strength and maximum velocity) and continuum luminosity are concordant. Therefore, we propose that the BAL variability observed in WPVS 007 is likely induced by the intrinsic ionizing continuum variation, alternative to the rotating-torus model proposed in a previous work. The BAL gas in WPVS 007 might be in the low-ionization state as traced by its weak N V BAL feature; as the ionizing continuum strengthens, the Ci IV and Si IV column densities also increase, resulting in stronger BALs and the emergence of high-velocity components of the outflow. The outflow launch radius might be as small as $\sim 8\times 10^{-4}$ pc under the assumption of being radiatively driven, but a large-scale origin (e.g., torus) cannot be fully excluded because of the unknown effects from additional factors, e.g., the magnetic field.

arXiv comment12 pages, 5 figures, accepted for publication in MNRAS

References in corpus (65)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Correcting for the Effects of Interstellar Extinction
• Observational Evidence of AGN Feedback
• A Quantitative Comparison of SMC, LMC, and Milky Way UV to NIR Extinction Curves
• Dynamics of line-driven disk winds in Active Galactic Nuclei
• Revisiting the Unified Model of Active Galactic Nuclei
• Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Powerful Outflows and Feedback from Active Galactic Nuclei
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• Kiloparsec-scale outflows are prevalent among luminous AGN: outflows and feedback in the context of the overall AGN population
• A high velocity ionised outflow and XUV photosphere in the narrow emission line quasar PG1211+143
• A Global Three Dimensional Radiation Magneto-hydrodynamic Simulation of Super-Eddington Accretion Disks
• Is Quasar Optical Variability a Damped Random Walk?
• A Massive X-Ray Outflow from the Quasar PDS 456
• Updating quasar bolometric luminosity corrections
• The Suzaku view of highly-ionised outflows in AGN: I - Statistical detection and global absorber properties
• Flexible and Scalable Methods for Quantifying Stochastic Variability in the Era of Massive Time-Domain Astronomical Data Sets
• Global Radiation-Magnetohydrodynamic Simulations of Black Hole Accretion Flow and Outflow: Unified Model of Three States
• The Quasar Outflow Contribution to AGN Feedback: VLT Measurements of SDSS J0318-0600
• Quasar Accretion Disks Are Strongly Inhomogeneous
• A Mid-IR Selected Changing-Look Quasar and Physical Scenarios for Abrupt AGN Fading
• Discovery of ultra-fast outflows in a sample of Broad Line Radio Galaxies observed with Suzaku
• Broad Absorption Line Variability on Multi-Year Timescales in a Large Quasar Sample
• Mid-infrared variability of changing-look AGN
• The response of relativistic outflowing gas to the inner accretion disk of a black hole
• Broad Absorption Line Disappearance on Multi-Year Timescales in a Large Quasar Sample
• A High-Velocity Narrow Absorption Line Outflow in the Quasar J212329.46-005052.9
• A new physical interpretation of optical and infrared variability in quasars
• Are Optically-Selected Quasars Universally X-Ray Luminous? X-Ray/UV Relations in Sloan Digital Sky Survey Quasars
• Broad P V Absorption in the BALQSO, PG 1254+047: Column Densities, Ionizations and Metal Abundances in BAL Winds
• Tombaugh 2: The First Open Cluster with a Significant Abundance Spread or Embedded in a Cold Stellar Stream?
• Variability in quasar broad absorption line outflows II. Multi-epoch monitoring of SiIV and CIV BAL variability
• Emergence of a Broad-Absorption-Line Outflow in the Narrow-line Seyfert 1 Galaxy WPVS 007
• Evidence for a radiatively driven disc-wind in PDS 456?
• Evidence for Large Temperature Fluctuations in Quasar Accretion Disks From Spectral Variability
• Ultrafast outflows disappear in high radiation fields
• The Sloan Digital Sky Survey Reverberation Mapping Project: Rapid CIV Broad Absorption Line Variability
• The Population of Tiny Near-Earth Objects Observed by NEOWISE
• Evidence for Photoionization Driven Broad Absorption Line Variability
• Short term X-ray spectral variability of the quasar PDS 456 observed in a low flux state
• The Sloan Digital Sky Survey Reverberation Mapping Project: Ensemble Spectroscopic Variability of Quasar Broad Emission Lines
• EUCLIA - Exploring the UV/optical continuum lag in active galactic nuclei. I. a model without light echoing
• Variation of ionizing continuum: the main driver of Broad Absorption Line Variability
• CIV Broad Absorption Line Acceleration in Sloan Digital Sky Survey Quasars
• The properties of broad absorption line outflows based on a large sample of quasars
• Multi-Epoch Observations of Extremely High-Velocity Emergent Broad Absorption
• A new powerful and highly variable disk wind in an AGN-star forming galaxy, the case of MCG-03-58-007
• Simulating the timescale dependent color variation in quasars with a revised inhomogeneous disk model
• AGN-starburst evolutionary connection : a physical interpretation based on radiative feedback
• The Ultra-Fast Outflow of the Quasar PG 1211+143 as Viewed by Time-Averaged Chandra Grating Spectroscopy
• Revealing the location and structure of the accretion disk-wind in PDS456
• First detection of hard X-ray photons in the soft X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007: The X-ray photon distribution observed by Swift
• The optical variability of SDSS quasars from multi-epoch spectroscopy. II. color variation
• Chandra observations of five X-ray transient galactic nuclei
• Variable Reddening and Broad Absorption Lines in the Narrow-line Seyfert 1 Galaxy WPVS 007: an Origin in the Torus
• Evolution of quasar stochastic variability along its main sequence
• AGN radiative feedback in dusty quasar populations
• Strong UV and X-ray variability of the Narrow Line Seyfert 1 Galaxy WPVS 007 -- on the nature of the X-ray low state
• C IV BAL disappearance in a large SDSS QSO sample
• An Update on the X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007: Swift observations of UV variability and persistence of X-ray faintness
• Evidence for a clumpy disc-wind in the star forming Seyfert\,2 galaxy MCG--03--58--007
• Quasar outflow energetics from broad absorption line variability

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