Continuum reverberation mapping of MCG 08-11-011

Abstract

We report the results from a photometric reverberation mapping campaign carried out with the C18 telescope at the Wise Observatory from 2019 to 2020, targeting the active galactic nucleus (AGN) MCG 08-11-011. The monitoring was conducted on a daily basis with specially designed narrow-band filters, spanning from optical to near-infrared wavelengths ($\sim 4000$ to $8000$Å) and avoiding prominent broad emission lines. We aim to measure inter-band continuum time lags, determine the size-wavelength relation, and estimate the host-subtracted AGN luminosity for this system. We used the point-spread function photometry to extract the continuum light curves and measure the inter-band time lags using several methods, including the interpolated cross-correlation function, the z-transformed discrete correlation function, a von Neumann estimator, JAVELIN (in spectroscopic and photometric mode), MICA, and a multivariate correlation function. We find wavelength-dependent lags, $\tau (\lambda )$, up to $\sim$7 days between the multiband light curves of MCG 08-11-011. The observed lags are larger than predictions based on standard thin-disk theory by a factor of $\sim 3-7$. We discern a significantly steeper ($\tau \propto {\lambda }^{4.74}$) size-wavelength relation than the $\tau \propto {\lambda }^{4/3}$ expected for a geometrically thin and optically thick accretion disk, which may result from the contribution of diffuse continuum emission to the flux. These results are similar to those found by previous continuum reverberation mapping campaigns.

arXiv admin note: text overlap with arXiv:2111.07385

References in corpus (16)

• Modeling the Time Variability of SDSS Stripe 82 Quasars as a Damped Random Walk
• Is Quasar Optical Variability a Damped Random Walk?
• Space Telescope and Optical Reverberation Mapping Project. II. Swift and HST Reverberation Mapping of the Accretion Disk of NGC 5548
• Sizes and Temperature Profiles of Quasar Accretion Disks from Chromatic Microlensing
• On the multi-wavelength variability of Mrk 110: Two components acting at different timescales
• A New Method for Measuring Extragalactic Distances
• The Centurion 18 telescope of the Wise Observatory
• Probing the Broad Line Region and the Accretion Disk in the Lensed Quasars HE0435-1223, WFI2033-4723, and HE2149-2745 using Gravitational Microlensing
• A Non-parametric Approach to Constrain the Transfer Function in Reverberation Mapping
• Quasar Microlensing Variability Studies Favor Shallow Accretion Disk Temperature Profiles
• Size of the accretion disk in the gravitationally lensed quasar SDSS J1004+4112 from the statistics of microlensing magnifications
• Methods of Reverberation Mapping. I. Time-lag Determination by Measures of Randomness
• The luminosity-dependent contribution from the broad line region to the wavelength-dependent lags in Mrk 110
• Near infrared and optical continuum emission region size measurements in the gravitationally lensed quasars Q0957+561 and SBS0909+532
• Revealing the structure of the lensed quasar Q 0957+561: I. Accretion disk size
• Microlensing Analysis for the gravitational lens systems SDSS0924+0219, Q1355-2257, and SDSS1029+2623

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• HALO I: Photometric continuum reverberation mapping of Fairall 9
• Intensive X-ray/UVOIR continuum reverberation mapping of the Seyfert AGN MCG+08-11-11