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Variability and the size-luminosity relation of the intermediate mass AGN in NGC 4395статья
- Авторы: Cho Hojin Woo, Jong-Hak, Hodges-Kluck Edmund, Son Donghoon, Ilić Dragana, Joner, Kang Michael, Daeun D., Kang Wonseok, Kaspi Sh, Nadzhip A.E., Francisco Pozo Nuez, Metlov V.G., Oknyansky V.L., Popovic Luka C., Shatsky N.I., Tatarnikov A.M.
- Журнал: ArXiv e-prints
- Номер: arxiv.org/pdf/2002.08028.pdf
- Год издания: 2020
- Первая страница: 1
- Последняя страница: 18
- Аннотация: We present the variability study of the lowest-luminosity Seyfert 1 galaxy NGC 4395 based on the photometric monitoring campaigns in 2017 and 2018. Using 22 ground-based and space telescopes, we monitored NGC 4395 with a ∼5 minute cadence during a period of 10 days and obtained light curves in the UV, V, J, H, and K/Ks bands as well as the Hα narrow-band. The RMS variability is ∼0.13 mag on \emph{Swift}-UVM2 and V filter light curves, decreasing down to ∼0.01 mag on K filter. After correcting for continuum contribution to the Hα narrow-band, we measured the time lag of the Hα emission line with respect to the V-band continuum as 55+27−31 to 122+33−67 min. in 2017 and 49+15−14 to 83+13−14 min. in 2018, depending on the assumption on the continuum variability amplitude in the Hα narrow-band. We obtained no reliable measurements for the continuum-to-continuum lag between UV and V bands and among near-IR bands, due to the large flux uncertainty of UV observations and the limited time baseline. We determined the AGN monochromatic luminosity at 5100Å λLλ=(5.75±0.40)×1039ergs−1, after subtracting the contribution of the nuclear star cluster. While the optical luminosity of NGC 4395 is two orders of magnitude lower than that of other reverberation-mapped AGNs, NGC 4395 follows the size-luminosity relation, albeit with an offset of 0.48 dex (≥2.5σ) from the previous best-fit relation of Bentz et al. (2013).
- Добавил в систему: Окнянский Виктор Львович