The evolution of the UV/optical lag spectrum of NGC 7469 seen by the Liverpool Telescope

Abstract

We present the results regarding the analysis of an intensive monitoring of the Active Galactic Nucleus (AGN) NGC 7469. We observed the source for 4 months with almost daily cadence in the ugriz bands, using the IO:O on the Liverpool Telescope. We measured the lags with respect to the u band and found a clear change of the lag spectrum between the first and the second half of the campaign. Given that the source varies on different timescales during these two segments, it is likely that different components are dominating the variability at different times. This result further confirms that reverberation models require a more complex geometry than a static illuminating point source and that particular attention has to be given in the interpretation of these delays.

arXiv commentPublished in Astronomische Nachrichten. 5 pages 2 figures

References in corpus (29)

• Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database
• First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
• Active Galactic Nuclei: what's in a name?
• X-ray reverberation around accreting black holes
• 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
• Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
• Reverberation mapping of Active Galactic Nuclei: from X-ray corona to dusty torus
• The First Swift Intensive AGN Accretion Disk Reverberation Mapping Survey
• Swift monitoring of NGC 5548: X-ray reprocessing and short term UV/optical variability
• 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
• The Origin of the X-ray and Ultraviolet Emission in NGC 7469
• X-ray/UV/optical variability of NGC 4593 with Swift: Reprocessing of X-rays by an extended reprocessor
• New constraints on the continuum-emission mechanism of AGN: Intensive monitoring of NGC 7469 in the X-ray and ultraviolet
• Quantifying the impact of variable BLR diffuse continuum contributions on measured continuum inter-band delays
• Intensive disc-reverberation mapping of Fairall 9: 1st year of Swift & LCO monitoring
• A dynamic black hole corona in an active galaxy through X-ray reverberation mapping
• Quantifying the Diffuse Continuum Contribution of BLR Clouds to AGN Continuum Inter-band Delays
• Modeling the UV/optical continuum time-lags in AGN
• UV/optical disk thermal reverberation in AGN: an in-depth study with an analytic prescription for the time-lag spectra
• On the multi-wavelength variability of Mrk 110: Two components acting at different timescales
• Temporal characteristics of the X-ray emission of NGC 7469
• Evidence for variability timescale dependent UV/X-ray delay in Seyfert 1 AGN NGC 7469
• Multi-wavelength campaign on NGC 7469 IV. The broad-band X-ray spectrum
• Multi-timescale reverberation mapping of Mrk 335
• Using AGN lightcurves to map accretion disc temperature fluctuations
• The luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110