AGN STORM 2. VII. A Frequency-resolved Map of the Accretion Disk in Mrk 817: Simultaneous X-ray Reverberation and UVOIR Disk Reprocessing Time Lags

Abstract

X-ray reverberation mapping is a powerful technique for probing the innermost accretion disk, whereas continuum reverberation mapping in the UV, optical, and infrared (UVOIR) reveals reprocessing by the rest of the accretion disk and broad-line region (BLR). We present the time lags of Mrk 817 as a function of temporal frequency measured from 14 months of high-cadence monitoring from Swift and ground-based telescopes, in addition to an XMM-Newton observation, as part of the AGN STORM 2 campaign. The XMM-Newton lags reveal the first detection of a soft lag in this source, consistent with reverberation from the innermost accretion flow. These results mark the first simultaneous measurement of X-ray reverberation and UVOIR disk reprocessing lags$\unicode{x2013}$effectively allowing us to map the entire accretion disk surrounding the black hole. Similar to previous continuum reverberation mapping campaigns, the UVOIR time lags arising at low temporal frequencies are longer than those expected from standard disk reprocessing by a factor of 2-3. The lags agree with the anticipated disk reverberation lags when isolating short-timescale variability, namely timescales shorter than the H$\beta$ lag. Modeling the lags requires additional reprocessing constrained at a radius consistent with the BLR size scale inferred from contemporaneous H$\beta$-lag measurements. When we divide the campaign light curves, the UVOIR lags show substantial variations, with longer lags measured when obscuration from an ionized outflow is greatest. We suggest that, when the obscurer is strongest, reprocessing by the BLR elongates the lags most significantly. As the wind weakens, the lags are dominated by shorter accretion disk lags.

arXiv comment28 pages, 11 figures, 3 tables. Accepted for publication in the Astrophysical Journal

References in corpus (83)

• Observational Evidence of AGN Feedback
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• Las Cumbres Observatory Global Telescope Network
• An online repository of Swift/XRT light curves of GRBs
• Are the Variations in Quasar Optical Flux Driven by Thermal Fluctuations?
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
• The Radius-Luminosity Relationship for Active Galactic Nuclei: The Effect of Host-Galaxy Starlight on Luminosity Measurements II. The Full Sample of Reverberation-Mapped AGNs
• X-ray reverberation around accreting black holes
• Non-linear X-ray variability in X-ray binaries and active galaxies
• Investigating a Fluctuating-accretion Model for the Spectral-timing Properties of Accreting Black Hole Systems
• On the X-ray time lags in the black hole candidates
• X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
• Space Telescope and Optical Reverberation Mapping Project. III. Optical Continuum Emission and Broad-Band Time Delays in NGC 5548
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Testing thermal reprocessing in AGN accretion discs
• Flexible and Scalable Methods for Quantifying Stochastic Variability in the Era of Massive Time-Domain Astronomical Data Sets
• Discovery of a relation between black hole mass and soft X-ray time lags in active galactic nuclei
• Spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale
• A global look at X-ray time lags in Seyfert Galaxies
• Broad iron L-line and X-ray reverberation in 1H0707-495
• Reverberation mapping of Active Galactic Nuclei: from X-ray corona to dusty torus
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IX 10 New Observations of Reverberation Mapping and Shortened H$\beta$ Lags
• The First Swift Intensive AGN Accretion Disk Reverberation Mapping Survey
• Space Telescope and Optical Reverberation Mapping Project. I. Ultraviolet Observations of the Seyfert 1 Galaxy NGC 5548 with the Cosmic Origins Spectrograph on Hubble Space Telescope
• Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability
• A characteristic optical variability timescale in astrophysical accretion disks
• Accretion disk reverberation with Hubble Space Telescope observations of NGC 4593: evidence for diffuse continuum lags
• The Variable Diffuse Continuum Emission of Broad Line Clouds
• The origin of the UV/optical lags in NGC 5548
• Discovery of high-frequency iron K lags in Ark 564 and Mrk 335
• X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor
• Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-Line Analysis for NGC 5548
• A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies
• Self-shadowing Effects of Slim Accretion Disks in Active Galactic Nuclei: Diverse Appearance of the Broad-line Region
• Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum inter-band delays
• Correlation and time delays of the X-ray and optical emission of the Seyfert Galaxy NGC3783
• Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring
• Space Telescope and Optical Reverberation Mapping Project VI: reverberating Disk Models for NGC 5548
• Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142
• Quantifying the Diffuse Continuum Contribution of BLR Clouds to AGN Continuum Inter-band Delays
• Modeling the UV/optical continuum time-lags in AGN
• Understanding Reverberation Lags in 1H0707-495
• The spatially resolved broad line region of IRAS 09149-6206
• Space Telescope and Optical Reverberation Mapping Project. IV. Anomalous behavior of the broad ultraviolet emission lines in NGC 5548
• UV/optical disk thermal reverberation in AGN: an in-depth study with an analytic prescription for the time-lag spectra
• Spectral variability and reverberation time delays in the Suzaku X-ray spectrum of NGC 4051
• Corona-Heated Accretion-disk Reprocessing (CHAR): A Physical Model to Decipher the Melody of AGN UV/optical Twinkling
• Discovery of a ~5 day characteristic timescale in the Kepler power spectrum of Zw 229-15
• On the multi-wavelength variability of Mrk 110: Two components acting at different timescales
• X-ray Variability of the Seyfert 1 Markarian 335: Power Spectrum and Time Lags
• Bolometric luminosity black-hole growth time and slim accretion discs in active galactic nuclei
• A wind-based unification model for NGC 5548: spectral holidays, non-disk emission, and implications for changing-look quasars
• Testing broad line region models with Reverberation Mapping
• Disentangling Time Series Spectra with Gaussian Processes: Applications to Radial Velocity Analysis
• Evidence for variability timescale dependent UV/X-ray delay in Seyfert 1 AGN NGC 7469
• Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-Line Holiday in NGC 5548
• Quasi-periodic Gaussian Processes for stellar activity: from physical to kernel parameters
• Calculating Time Lags From Unevenly-Sampled Light Curves
• Frequency-resolved lags in UV/optical continuum reverberation mapping
• The Centurion 18 telescope of the Wise Observatory
• UV/Optical disk reverberation lags despite a faint X-ray corona in the AGN Mrk 335
• Gaussian Process Modelling of Asteroseismic Data
• Oscillatory patterns in the light curves of 5 long-term monitored type 1 AGN
• Rimmed and Rippled Accretion Disc Models to Explain AGN Continuum Lags
• The imprints of AGN feedback within a supermassive black hole's sphere of influence
• Low frequency X-ray timing with Gaussian processes and reverberation in the radio-loud AGN 3C 120
• Is there a UV/X-ray connection in IRAS 13224-3809?
• Explaining the moderate UV/X-ray correlation in AGN
• A physical model for the UV/optical power spectra of AGN
• Modelling the Multiwavelength Variability of Mrk 335 using Gaussian Processes
• Short-Timescale monitoring of the X-ray, UV and broad double-peak emission line of the nucleus of NGC 1097
• AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817
• X-ray Reverberation Mapping of Ark 564 using Gaussian Process Regression
• Ultraviolet and X-ray Variability of the Seyfert 1.5 Galaxy Markarian 817
• X-ray/UVOIR Frequency-resolved Time Lag Analysis of Mrk 335 Reveals Accretion Disk Reprocessing
• A Negative Long Lag from the Optical to the UV Continuum in Fairall 9
• AGN STORM 2: II. Ultraviolet Observations of Mrk817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope
• The Inner Accretion Flow in the Resurgent Seyfert-1.2 AGN Mrk 817
• A Generative Model for Quasar Spectra
• Wayne State Universitys Dan Zowada Memorial Observatory: Characterization and Pipeline of a 0.5 Meter Robotic Telescope

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