Origin of the complex iron line structure and spectral variation in Mrk 766

Abstract

Complex Fe-K emission/absorption line features are commonly observed in the 6--11 keV band from Active Galactic Nuclei (AGN). These features are formed in various physical components surrounding the black holes. The Narrow-Line Seyfert 1 (NLS1) galaxy Mrk 766, in particular, exhibits characteristic blue-shifted Fe-K absorption lines caused by the ultra-fast outflow (UFO), and a broad Fe-K emission line, as well as variable absorbers partially covering the X-ray emitting region. We re-analyze the Mrk 766 archival data of XMM-Newton, NuSTAR, and Swift to investigate the origin of the Fe-K line feature and the 0.3--79 keV energy spectral variation. We have found that the spectral variation in $\lesssim$10 keV is primarily explained by the variable partial covering of the central X-ray source by multi-layer absorbing clouds. The Fe-K line feature consists of the blue-shifted absorption lines due to the UFO, a narrow emission line from the distant material, a broad emission line from the inner-disk reflection, and a slightly broadened weak emission line at around 6.4--6.7 keV whose equivalent width is $\sim$0.05 keV. The last one is presumably due to the resonance scattering in the UFO out of the line-of-sight, as predicted by a Monte Carlo simulation based on the hydrodynamical UFO modeling. We suggest that the seemingly complex Fe-K line features and the X-ray energy spectra of Mrk 766 are explained by a moderately extended central X-ray source around a Schwarzschild black hole, an optically thick accretion disk with a truncated inner-radius, the UFO, multi-layer partial covering clouds, and a torus.

arXiv comment11 pages, 7 figures, Published in MNRAS

References in corpus (44)

• On the Absorption of X-rays in the Interstellar Medium
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• A Structure for Quasars
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• An XMM-Newton survey of broad iron lines in Seyfert galaxies
• A high velocity ionised outflow and XUV photosphere in the narrow emission line quasar PG1211+143
• The AGN Black Hole Mass Database
• The role of the reflection fraction in constraining black hole spin
• Photoionization Modeling and the K Lines of Iron
• Unification of X-ray winds in Seyfert galaxies: from ultra-fast outflows to warm absorbers
• A fast and long-lived outflow from the supermassive black hole in NGC 5548
• Evidence for ultra-fast outflows in radio-quiet AGNs: II - detailed photo-ionization modeling of Fe K-shell absorption lines
• A Compton-thick Wind in the High Luminosity Quasar, PDS 456
• X-ray absorption by Broad Line Region Clouds in Mrk 766
• Variable partial covering and a relativistic iron line in NGC 1365
• "Comets" orbiting a black hole
• Clumpy Outflow from Supercritical Accretion Flows
• The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source
• The variable X-ray spectrum of Markarian 766 - I. Principal components analysis
• Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows
• X-Ray Spectral Model from Clumpy Torus and Its Application to Circinus Galaxy
• The origin of ultra-fast outflows in AGN: Monte-Carlo simulations of the wind in PDS 456
• The Variable X-ray Spectrum of Markarian 766 - II. Time-Resolved Spectroscopy
• Fe K emission and absorption features in XMM-Newton spectra of Mkn 766 - evidence for reprocessing in flare ejecta
• The Mass and Spin of The Extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and Its Implications for The Trigger for Relativistic Jets
• The Effect of Returning Radiation on Relativistic Reflection
• Three-dimensional structure of clumpy outflow from supercritical accretion flow onto black holes
• UV line driven disc wind as the origin of ultrafast outflows in AGN
• Thermally driven wind as the origin of warm absorbers in AGN
• Variable iron-line emission near the black hole of Markarian 766
• A Variable Partial Covering Model for the Seyfert 1 Galaxy MCG-6-30-15
• Interpretation of the X-ray Spectral Variation of 1H0707-495 with a Variable Double Partial Covering Model
• Probing general relativistic effects during AGN X-ray eclipses
• X-ray reverberation lags of the Fe-K line due to AGN disc winds
• Application of Clumpy Torus Model to Broadband X-ray Spectra of Two Seyfert 1 Galaxies: IC 4329A and NGC 7469
• NuSTAR observations of Mrk 766: distinguishing reflection from absorption
• Origin of the Broad Iron Line Feature and the Soft X-ray Variation in Seyfert Galaxies
• Revising the merger scenario of the galaxy cluster Abell 1644: a new gas poor structure discovered by weak gravitational lensing
• Complex Narrow Line Seyfert 1s: High spin or high inclination?
• Origin of the Characteristic X-ray Spectral Variations of IRAS 13224$-$3809
• MPI_XSTAR: MPI-based Parallelization of the XSTAR Photoionization Program
• Simple interpretation of the seemingly complicated X-ray spectral variation of NGC 5548

Cited by in corpus (1)

• Structured ionized winds shooting out from a quasar at relativistic speeds