ADDITIONAL SUPPORT FOR RELATIVE WAVELENGTH INDEPENDENCE OF IR LAGS IN NGC 4151 OVER THE PAST DECADE

Oknyansky, V.L.; Shenavrin, V.I.; Metlova, N.V.; Gaskell, C.M.

Авторы: Oknyansky V.L., Shenavrin V.I., Metlova N.V., Gaskell C.M.
Журнал: Odessa Astronomical Publications
Том: 31
Год издания: 2018
Первая страница: 94
Последняя страница: 99
DOI: 10.18524/1810-4215.2018.31.144622
Аннотация: We present results of a study of the correlation between the infrared (JHKL) and optical (B) fluxes of the nucleus of the Seyfert galaxy NGC 4151 for the years 2010-2015 using our own data (partially published) in combination with published data. We find similar lags for each of the $HKL$ passbands relative to the optical of 37 +- 3 days. The lags are the same to within the accuracy of measurement. We do not confirm a significant decrease in the lag for HKL in 2013-2014 previously reported by Schnulle et al.(2015), but we find that the lag of the short-lag component of J increased. We discuss our results within the framework of the standard model, where the variable infrared radiation is mainly due to the thermal re-emission of short-wave radiation by dust clouds close to a variable central source. There is also some contribution to the IR emission from the accretion disk, and this contribution increases with decreasing wavelength. The variability in J and K is not entirely simultaneous, which may be due to the differing contributions of the radiation from the accretion disk in these bands. The absence of strong wavelength-dependent changes in infrared lag across the $HKL$ passbands can be explained by having the dust clouds during 2010-2015 be located beyond the sublimation radius. The relative wavelength independence of the infrared lags is also consistent with the hollow bi-conical outflow model of Oknyansky et al. (2015).
Добавил в систему: Окнянский Виктор Львович

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ADDITIONAL SUPPORT FOR RELATIVE WAVELENGTH INDEPENDENCE OF IR LAGS IN NGC 4151 OVER THE PAST DECADEстатья Исследовательская статья

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