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Variability and the size-luminosity relation of the intermediate mass AGN in NGC 4395 | | Hojin Cho
; Jong-Hak Woo
; Edmund Hodges-Kluck
; Donghoon Son
; Jaejin Shin
; Elena Gallo
; Hyun-Jin Bae
; Thomas G. Brink
; Wanjin Cho
; Alexei V. Filippenko
; John C. Horst
; Dragana Ilić
; Michael. D. Joner
; Daeun Kang
; Wonseok Kang
; Shai Kaspi
; Taewoo Kim
; Andjelka B. Kovačević
; Sahana Kumar
; Huynh Anh N. Le
; A. E. Nadzhip
; Francisco Pozo Nuñez
; V.G. Metlov
; V. L. Oknyansky
; Songyoun Park
; Luka Č. Popović
; Suvendu Rakshit
; Malte Schramm
; N. I. Shatsky
; Michelle Spencer
; Eon-Chang Sung
; Hyun-il Sung
; A. M. Tatarnikov
; Oliver Vince
; | | Date: |
19 Feb 2020 | | Abstract: | 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 $sim$5
minute cadence during a period of 10 days and obtained light curves in the UV,
V, J, H, and K/Ks bands as well as the H$alpha$ narrow-band. The RMS
variability is $sim$0.13 mag on emph{Swift}-UVM2 and V filter light curves,
decreasing down to $sim$0.01 mag on K filter. After correcting for continuum
contribution to the H$alpha$ narrow-band, we measured the time lag of the
H$alpha$ 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 H$alpha$ 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 5100AA $lambda L_lambda = left(5.75pm0.40
ight) imes
10^{39},mathrm{erg,s^{-1}}$, 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
($geq$2.5$sigma$) from the previous best-fit relation of Bentz et al. (2013). | | Source: | arXiv, 2002.8028 | | Services: | Forum | Review | PDF | Favorites | |
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