Still alive and kicking: A significant outburst in changing-look AGN Mrk 1018

Article

Brogan, R., Krumpe, M., Homan, D., Urrutia, T., Granzer, T., Husemann, B., Neumann, J., Gaspari, M., Vaughan, S. P., Croom, S.M., Combes, F., Pérez-Torres, M., Coil, A., McElroy, R., Winkel, N. and Singha, M.. 2023. "Still alive and kicking: A significant outburst in changing-look AGN Mrk 1018." Astronomy and Astrophysics: a European journal. 677. https://doi.org/10.1051/0004-6361/202346475
Article Title

Still alive and kicking: A significant outburst in changing-look AGN Mrk 1018

ERA Journal ID1050
Article CategoryArticle
AuthorsBrogan, R., Krumpe, M., Homan, D., Urrutia, T., Granzer, T., Husemann, B., Neumann, J., Gaspari, M., Vaughan, S. P., Croom, S.M., Combes, F., Pérez-Torres, M., Coil, A., McElroy, R., Winkel, N. and Singha, M.
Journal TitleAstronomy and Astrophysics: a European journal
Journal Citation677
Article NumberA116
Number of Pages19
Year2023
PublisherEDP Sciences
Place of PublicationFrance
ISSN0004-6361
1432-0746
Digital Object Identifier (DOI)https://doi.org/10.1051/0004-6361/202346475
Web Address (URL)https://www.aanda.org/articles/aa/full_html/2023/09/aa46475-23/aa46475-23.html
Abstract

Context. Changing-look active galactic nuclei (AGN) have been observed to change their optical spectral type. Mrk 1018 is particularly unique: first classified as a type 1.9 Seyfert galaxy, it transitioned to being a type 1 Seyfert galaxy a few years later before returning to its initial classification as a type 1.9 Seyfert galaxy after ∼30 years.

Aims. We present the results of a high-cadence optical monitoring programme that caught a major outburst in 2020. Due to sunblock, only the decline could be observed for ∼200 days. We studied X-ray, UV, optical, and infrared data before and after the outburst to investigate the responses of the AGN structures.

Methods. We derived a u′-band light curve of the AGN contribution alone. The flux increased by a factor of ∼13. We confirmed this in other optical bands and determined the shape and speed of the decline in each waveband. The shapes of Hβ and Hα were analysed before and after the event. Two XMM-Newton observations (X-ray and UV) from before and after the outburst were also exploited.

Results. The outburst is asymmetric, with a swifter rise than decline. The decline is best fit by a linear function, ruling out a tidal disruption event. The optical spectrum shows no change approximately eight months before and 17 months after. The UV flux is increased slightly after the outburst but the X-ray primary flux is unchanged. However, the 6.4 keV iron line has doubled in strength. Infrared data taken 13 days after the observed optical peak already show an increased emission level as well.

Conclusions. Calculating the distance of the broad-line region and inner edge of the torus from the supermassive black hole can explain the multi-wavelength response to the outburst, in particular: i) the unchanged Hβ and Hα lines, ii) the unchanged primary X-ray spectral components, iii) the rapid and extended infrared response, as well as iv) the enhanced emission of the reflected 6.4 keV line. The outburst was due to a dramatic and short-lasting change in the intrinsic accretion rate. We discuss different models as potential causes.

Keywordsaccretion; accretion disks; black hole physics; galaxies: active;
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020510102. Astronomical instrumentation
Byline AffiliationsLeibniz Institute for Astrophysics Potsdam, Germany
University of Potsdam, Germany
EUMETSAT, Germany
Max Planck Institute for Astronomy, Germany
Princeton University, United States
Macquarie University
Swinburne University of Technology
ARC Centre of Excellence for Astronomy in Three Dimensions (ASTRO-3D), Australia
University of Sydney
Sorbonne University, France
Institute of Astrophysics of Andalusia, Spain
University of Zaragoza, Spain
European University Cyprus, Cyprus
University of California San Diego, United States
University of Queensland
University of Manitoba, Canada
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