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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Long-term multiwavelength monitoring and reverberation mapping of NGC 2617 during a changing-look event
Monthly Notices of the Royal Astronomical Society, Volume 525, No. 2, Year 2023
Notification
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Description
We present the results of photometric and spectroscopic monitoring campaigns of the changing look AGN NGC 2617 carried out from 2016 until 2022 and covering the wavelength range from the X-ray to the near-IR. The facilities included the telescopes of the SAI MSU, MASTER Global Robotic Net, the 2.3-m WIRO telescope, Swift, and others. We found significant variability at all wavelengths and, specifically, in the intensities and profiles of the broad Balmer lines. We measured time delays of ∼6 d (∼8 d) in the responses of the Hβ (Hα) line to continuum variations. We found the X-ray variations to correlate well with the UV and optical (with a small time delay of a few days for longer wavelengths). The K-band lagged the B band by 14 ± 4 d during the last three seasons, which is significantly shorter than the delays reported previously by the 2016 and 2017-2019 campaigns. Near-IR variability arises from two different emission regions: the outer part of the accretion disc and a more distant dust component. The HK-band variability is governed primarily by dust. The Balmer decrement of the broad-line components is inversely correlated with the UV flux. The change of the object's type from Sy1 to Sy1.8 was recorded over a period of ∼8 yr. We interpret these changes as a combination of two factors: changes in the accretion rate and dust recovery along the line of sight. © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Authors & Co-Authors
Oknyansky, Victor L.
Russian Federation, Moscow
Lomonosov Moscow State University
Israel, Haifa
University of Haifa
Brotherton, Michael S.
United States, Laramie
University of Wyoming
Tsygankov, Sergey S.
Finland, Turku
Turun Yliopisto
Dodin, Alexander V.
Russian Federation, Moscow
Lomonosov Moscow State University
Tatarnikov, Andrey M.
Russian Federation, Moscow
Lomonosov Moscow State University
Du, Pu
China, Beijing
Chinese Academy of Sciences
Bao, Dongwei
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Burlak, Marina A.
Russian Federation, Moscow
Lomonosov Moscow State University
Ikonnikova, Natalia P.
Russian Federation, Moscow
Lomonosov Moscow State University
Lipunov, Vladimir M.
Russian Federation, Moscow
Lomonosov Moscow State University
Gorbovskoy, Evgeny S.
Russian Federation, Moscow
Lomonosov Moscow State University
Metlov, Vladimir G.
Russian Federation, Moscow
Lomonosov Moscow State University
Belinski, A. A.
Russian Federation, Moscow
Lomonosov Moscow State University
Shatsky, Nikolai I.
Russian Federation, Moscow
Lomonosov Moscow State University
Maslennikova, Nataliia A.
Russian Federation, Moscow
Lomonosov Moscow State University
Wang, Jianmin
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Zhai, Shuo
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Fang, Fengna
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Kasper, David H.
United States, Chicago
The University of Chicago
Huseynov, Nazim A.
Azerbaijan, Shamakhy
Shamakhy Astrophysical Observatory, Azerbaijan
McLane, Jacob N.
United States, Laramie
University of Wyoming
Maithil, Jaya
United States, Laramie
University of Wyoming
Zastrocky, Theodora E.
United States, Laramie
University of Wyoming
Olson, Kianna A.
United States, Laramie
University of Wyoming
Chelouche, Doron
Israel, Haifa
University of Haifa
Oknyansky, R. S.
Israel, Tel Aviv-yafo
Tel Aviv University
Buckley, David A.H.
South Africa, Cape Town
South African Astronomical Observatory
Tyurina, Natalia V.
Russian Federation, Moscow
Lomonosov Moscow State University
Kuznetsov, Artem S.
Russian Federation, Moscow
Lomonosov Moscow State University
Rebolo, R.
Unknown Affiliation
Zhao, Bixuan
China, Beijing
Chinese Academy of Sciences
Statistics
Authors: 31
Affiliations: 11
Identifiers
Doi:
10.1093/mnras/stad2442
ISSN:
00358711
Research Areas
Environmental