| Issue |
A&A
Volume 672, April 2023
|
|
|---|---|---|
| Article Number | A132 | |
| Number of page(s) | 10 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202244905 | |
| Published online | 12 April 2023 | |
Continuum reverberation mapping of MCG 08-11-011⋆
1
Departamento de Astronomía y Astrofísica, Universidad de Valencia, 46100 Burjassot, Valencia, Spain
e-mail: carina.fian@uv.es
2
School of Physics and Astronomy and Wise Observatory, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv, Israel
3
Department of Physics, Faculty of Natural Sciences, University of Haifa, Haifa 3498838, Israel
4
Haifa Research Center for Theoretical Physics and Astrophysics, University of Haifa, Haifa 3498838, Israel
5
NASA Postdoctoral Program Fellow, NASA Goddard Space Flight Center, Code 661, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
Received:
7
September
2022
Accepted:
1
February
2023
Aims. 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 (∼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.
Methods. 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.
Results. We find wavelength-dependent lags, τ(λ), up to ∼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 ∼3 − 7. We discern a significantly steeper (τ ∝ λ4.74) size-wavelength relation than the τ ∝ λ4/3 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.
Key words: accretion, accretion disks / galaxies: active / galaxies: Seyfert / galaxies: photometry / galaxies: individual: MCG 08-11-011 / galaxies: nuclei
Light curves are only available at the CDS via anonymous ftp to cdsarc.cds.unistra.fr (130.79.128.5) or via https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A132
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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