Multi-Wavelength Monitoring and Reverberation Mapping of NGC 2617 at Deepest MinimumWith a Sharp Upward Turn During 2021–2024

Oknyansky, V.L.; Brotherton, M.S.; Tsygankov, S.S.; Dodin, A.V.; Tatarnikov, A.M.; Du P; Burlak, M.A.; Ikonnikova, N.P.; Metlov, V.G.; Belinski, A.A.; Shatsky, N.I.; Wang, J.M.; Bao, D.W.; Fang, F.; Zhai, S.; Fu, Y.X.; Bai, H.R.; Zastrocky, T.E.; Chelouche, D.; Figaredo, C.S.; Kaspi, S.; Gaskell, C.M.

Авторы: Oknyansky V.L., Brotherton M.S., Tsygankov S.S., Dodin A.V., Tatarnikov A.M., Du P, Burlak M.A., Ikonnikova N.P., Metlov V.G., Belinski A.A., Shatsky N.I., Wang J.M., Bao D.W., Fang F., Zhai S., Fu Y.X., Bai H.R., Zastrocky T.E., Chelouche D., Figaredo C.Sobrino, Kaspi S., Gaskell C.M.
Журнал: Monthly Notices of the Royal Astronomical Society
Том: 536
Год издания: 2025
Издательство: Oxford Journals, Oxford University Press
Местоположение издательства: Oxford, UK, England
Первая страница: 2089
Последняя страница: 2102
DOI: 10.1093/mnras/stae2707
Аннотация: We present the results of a new X-ray to near-IR photometric and spectroscopic monitoring of the changing look AGN NGC 2617 carried out from March 2022 to March 2024. We found significant variability at all wavelengths and in the intensities and profiles of the broad Balmer lines. Reverberation mapping was carried out for three observing seasons during 2021-2024. We obtained time delays of ∼4 d for the response of the Hβ line to optical continuum variations. The X-ray variations correlate well with the UV and optical, with a few days lag for longer wavelengths. The K band lagged the B band by ∼ 15 d during the last 3 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 Hβ/Hα ratio variations (for broad components only) correlate with the X-ray and UV fluxes. The spectral type changed from type 1.8 to type 1.9 during October 2023–January 2024 and then a more rapid change to type 1.5 occurred in February 2024. We interpret these changes as a combination of two factors: changes in the accretion rate as a dominant cause but also the sublimation or recovery of dust along the line of sight.
Добавил в систему: Окнянский Виктор Львович

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Multi-Wavelength Monitoring and Reverberation Mapping of NGC 2617 at Deepest MinimumWith a Sharp Upward Turn During 2021–2024статья

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