Chasing obscuration in type-I AGN: discovery of an eclipsing clumpy wind at the outer broad-line region of NGC 3783

Abstract

In 2016 we carried out a Swift monitoring program to track the X-ray hardness variability of eight type-I AGN over a year. The purpose of this monitoring was to find intense obscuration events in AGN, and thereby study them by triggering joint XMM-Newton, NuSTAR, and HST observations. We successfully accomplished this for NGC 3783 in December 2016. We found heavy X-ray absorption produced by an obscuring outflow in this AGN. As a result of this obscuration, interesting absorption features appear in the UV and X-ray spectra, which are not present in the previous epochs. Namely, the obscuration produces broad and blue-shifted UV absorption lines of Ly$\alpha$, C IV, and N V, together with a new high-ionisation component producing Fe XXV and Fe XXVI absorption lines. In soft X-rays, only narrow emission lines stand out above the diminished continuum as they are not absorbed by the obscurer. Our analysis shows that the obscurer partially covers the central source with a column density of few $10^{23}$ cm${}^{-2}$, outflowing with a velocity of few thousand km s${}^{-1}$. The obscuration in NGC 3783 is variable and lasts for about a month. Unlike the commonly-seen warm-absorber winds at pc-scale distances from the black hole, the eclipsing wind in NGC 3783 is located at about 10 light days. Our results suggest the obscuration is produced by an inhomogeneous and clumpy medium, consistent with clouds in the base of a radiatively-driven disk wind at the outer broad-line region of the AGN.

arXiv commentAccepted for publication in Astronomy & Astrophysics (A&A), 6 pages, 6 figures

References in corpus (40)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• Observational Evidence of AGN Feedback
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Determining Central Black Hole Masses in Distant Active Galaxies and Quasars. II. Improved Optical and UV Scaling Relationships
• The Low-Luminosity End of the Radius-Luminosity Relationship for Active Galactic Nuclei
• Dynamics of Line-Driven Disk Winds in Active Galactic Nuclei II: Effects of Disk Radiation
• Optimal binning of X-ray spectra and response matrix design
• The nature and origin of Seyfert warm absorbers
• Photoionization Modeling and the K Lines of Iron
• Locally Optimally Emitting Clouds and the Origin of Quasar Emission Lines
• The Ionized Gas and Nuclear Environment in NGC 3783. I. Time-Averaged 900 ks Chandra Grating Spectroscopy
• Intrinsic Absorption Lines in Seyfert 1 Galaxies. I. Ultraviolet Spectra from the Hubble Space Telescope
• Black hole feedback in the luminous quasar PDS 456
• Occultation measurement of the size of the X-ray emitting region in the Active Galactic Nucleus of NGC 1365
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• First X-ray-Based Statistical Tests for Clumpy-Torus Models: Eclipse Events from 230 Years of Monitoring of Seyfert AGN
• A Compton-thick Wind in the High Luminosity Quasar, PDS 456
• Anatomy of the AGN in NGC 5548: I. A global model for the broadband spectral energy distribution
• X-ray absorption by Broad Line Region Clouds in Mrk 766
• A Long Look at NGC 3783 with the XMM-Newton Reflection Grating Spectrometers
• Modeling of iron K lines: radiative and Auger decay data for Fe II-Fe IX
• Systematic comparison of photoionised plasma codes with application to spectroscopic studies of AGN in X-rays
• Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?
• Multi-wavelength study of the Seyfert 1 galaxy NGC 3783 with XMM-Newton
• The Ionized Gas and Nuclear Environment in NGC 3783 V. Variability and Modeling of the Intrinsic Ultraviolet Absorption
• Multiwavelength campaign on Mrk 509 VIII. Location of the X-ray absorber
• The rise of an ionized wind in the Narrow Line Seyfert 1 Galaxy Mrk 335 observed by XMM-Newton and HST
• Revealing the ultra-fast outflow in IRAS 13224-3809 through spectral variability
• Short term X-ray spectral variability of the quasar PDS 456 observed in a low flux state
• Probing the dusty environment of the Seyfert 1 nucleus in NGC 3783 with MIDI/VLTI interferometry
• The Multi-Layer Variable Absorbers in NGC 1365 Revealed by XMM-Newton and NuSTAR
• Anatomy of the AGN in NGC 5548: VII. Swift study of obscuration and broadband continuum variability
• A Suzaku, NuSTAR, and XMM-Newton view on variable absorption and relativistic reflection in NGC 4151
• Discovery of a fast, broad, transient outflow in NGC 985
• The BeppoSAX broad-band spectrum and variability of the Seyfert 1 NGC 3783
• The effects of irradiation on the cloud evolution in active galactic nuclei
• Chandra High-Resolution X-ray Spectroscopy of the Fe K Line in the Seyfert 1 Galaxy NGC 3783
• The thermal instability of the warm absorber in NGC 3783
• Long-term X-ray stability and UV variability of the ionized absorption in NGC 3783

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