The curtain remains open: NGC 2617 continues in a high stateстатья

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[1] The curtain remains open: Ngc 2617 continues in a high state / V. L. Oknyansky, C. M. Gaskell, N. A. Huseynov et al. // Monthly Notices of the Royal Astronomical Society. — 2017. — Vol. 467, no. 2. — P. 1496–1504. Optical and near-infrared photometry, optical spectroscopy, and soft X-ray and UV monitoring of the changing look active galactic nucleus NGC 2617 show that it continues to have the appearance of a type-1 Seyfert galaxy. An optical light curve for 2010–2016 indicates that the change of type probably occurred between October 2010 and February 2012 and was not related to the brightening in 2013. In 2016 NGC 2617 brightened again to a level of activity close to that of April 2013. We find variations in all passbands and in both the intensities and profiles of the broad Balmer lines. A new displaced emission peak has appeared in Hβ. X-ray variations are well correlated with UV–optical variability and possibly lead by ∼ 2–3 days. The K band lags the J band by about 21.5 ± 2.5 days and lags the combined B+J filters by ∼ 25 days. J lags B by about 3 days. This could be because J-band variability arises from the outer part of the accretion disc while K-band variability comes from thermal re-emission by dust. We propose that spectral type changes are a result of increasing central luminosity causing sublimation of the innermost dust in the hollow bi-conical outflow. We briefly discuss various other possible reasons which might explain the dramatic changes NGC 2617. [ DOI ]

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