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Variability and the Size–Luminosity Relation of the Intermediate-mass AGN in NGC 4395

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dc.contributor.author Cho, Hojin
dc.contributor.author Woo, Jong-Hak
dc.contributor.author Hodges-Kluck, E
dc.contributor.author Son, Donghoon
dc.contributor.author Shin, Jaejin
dc.contributor.author Gallo, Elena
dc.contributor.author Bae, Hyun-Jin
dc.contributor.author Brink, T. G
dc.contributor.author Cho, Wanjin
dc.contributor.author Filippenko, A. V
dc.contributor.author Horst, J. C
dc.contributor.author Ilic, Dragana
dc.contributor.author Joner, M. D
dc.contributor.author Kang, Daeun
dc.contributor.author Kang, Wonseok
dc.contributor.author Kaspi, Shai
dc.contributor.author Kim, Taewoo
dc.contributor.author Kovacevic, A. B
dc.contributor.author Kumar, S
dc.contributor.author Le, Huynh Anh N
dc.contributor.author Nadzhip, A. E
dc.contributor.author Nunez, F. P
dc.contributor.author Metlov, V. G
dc.contributor.author Oknyansky, V. L
dc.contributor.author Park, Songyoun
dc.contributor.author Popovic, L. C
dc.contributor.author Rakshit, S
dc.contributor.author Schramm, M
dc.contributor.author Shatsky, N. I
dc.contributor.author Spencer, M
dc.contributor.author Sung, E.-H
dc.contributor.author Sung, H.-i
dc.contributor.author Tatarnikov, A. M
dc.contributor.author Vince, O
dc.date.accessioned 2021-02-14T06:08:03Z
dc.date.available 2021-02-14T06:08:03Z
dc.date.issued 2020-04-01
dc.identifier.citation The Astrophysical Journal, Vol. 892, No. 2, 93 en_US
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/2248/7640
dc.description Restricted Access © The American Astronomical Society https://doi.org/10.3847/1538-4357/ab7a98 en_US
dc.description.abstract We present a variability study of the lowest-luminosity Seyfert 1 nucleus of the galaxy NGC 4395 based on 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 ultraviolet (UV), V, J, H, and K/Ks bands, as well as narrowband Hα. The rms variability is ∼0.13 mag in the Swift UVM2 and V filter light curves, decreasing down to ∼0.01 mag in the K filter. After correcting for the 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 31 27– - + 122 67 33 minutes in 2017 and - + 49 14 15– - + 83 14 13 minutes in 2018, depending on assumptions about the continuum variability amplitude in the Hα narrow band. We obtained no reliable measurements for the continuum-tocontinuum lag between UV and V bands and among near-IR bands, owing to the large flux uncertainty of UV observations and the limited time baseline. We determined the active galactic nucleus (AGN) monochromatic luminosity at 5100 Å, l l =´ ( ) - L 5.75 0.40 10 erg s 39 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 en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Reverberation mapping en_US
dc.subject Active galactic nuclei en_US
dc.subject Active galaxies en_US
dc.subject Galaxy nuclei en_US
dc.subject Low-luminosity active galactic nuclei en_US
dc.subject Intermediate-mass black holes en_US
dc.subject Seyfert galaxies en_US
dc.title Variability and the Size–Luminosity Relation of the Intermediate-mass AGN in NGC 4395 en_US
dc.type Article en_US

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