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Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142

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Date
10/06/2020
Author
Cackett, Edward M.
Gelbord, Jonathan
Li, Yan-Rong
Horne, Keith
Wang, Jian-Min
Barth, Aaron J.
Bai, Jin-Ming
Bian, Wei-Hao
Carroll, Russell W.
Du, Pu
Edelson, Rick
Goad, Michael R.
Ho, Luis C.
Hu, Chen
Khatu, Viraja C.
Luo, Bin
Miller, Jake
Yuan, Ye-Fei
Keywords
Accretion, accretion disks
Galaxies: active
Galaxies: individual (Mrk 142)
Galaxies: nuclei
Galaxies: Seyfert
QB Astronomy
QC Physics
DAS
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Abstract
We performed an intensive accretion disk reverberation mapping campaign on the high accretion rate active galactic nucleus Mrk 142 in early 2019. Mrk 142 was monitored with the Neil Gehrels Swift Observatory for four months in X-rays and six different UV/optical filters. Ground-based photometric monitoring was obtained from the Las Cumbres Observatory, the Liverpool Telescope, and the Dan Zowada Memorial Observatory in ugriz filters, as well as from the Yunnan Astronomical Observatory in V. Mrk 142 was highly variable throughout, displaying correlated variability across all wavelengths. We measure significant time lags between the different wavelength lightcurves. In the UV and optical, we find that the wavelength-dependent lags, τ(λ), generally follow the relation τ(λ) ∝ λ 4/3, as expected for the T ∝ R −3/4 profile of a steady-state, optically thick, geometrically thin accretion disk, though they can also be fit by τ(λ) ∝ λ 2, as expected for a slim disk. The exceptions are the u and U bands, where an excess lag is observed, as has been observed in other active galactic nuclei and attributed to continuum emission arising in the broad-line region. Furthermore, we perform a flux–flux analysis to separate the constant and variable components of the spectral energy distribution, finding that the flux dependence of the variable component is consistent with the f ν  ∝ ν 1/3 spectrum expected for a geometrically thin accretion disk. Moreover, the X-ray to UV lag is significantly offset from an extrapolation of the UV/optical trend, with the X-rays showing a poorer correlation with the UV than the UV does with the optical. The magnitude of the UV/optical lags is consistent with a highly super-Eddington accretion rate.
Citation
Cackett , E M , Gelbord , J , Li , Y-R , Horne , K , Wang , J-M , Barth , A J , Bai , J-M , Bian , W-H , Carroll , R W , Du , P , Edelson , R , Goad , M R , Ho , L C , Hu , C , Khatu , V C , Luo , B , Miller , J & Yuan , Y-F 2020 , ' Supermassive black holes with high accretion rates in active galactic nuclei. XI. Accretion disk reverberation mapping of Mrk 142 ' , Astrophysical Journal , vol. 896 , no. 1 , 1 . https://doi.org/10.3847/1538-4357/ab91b5
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/ab91b5
ISSN
0004-637X
Type
Journal article
Rights
Copyright © 2020 American Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-4357/ab91b5.
Description
Funding: KH acknowledges support from UK STFC grant ST/R00824/1.
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  • University of St Andrews Research
URL
https://arxiv.org/abs/2005.03685
URI
http://hdl.handle.net/10023/19913

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