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Title: Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-loud Narrow-line Seyfert 1 Galaxy?
Authors: Tanaka, M
Morokuma, T
Itoh, R
Akitaya, H
Tominaga, N
Saito, Y
Stawarz, L
Tanaka, Y, T
Gandhi, P
Ali, G
Aoki, T
Contreras, C
Doi, M
Essam, A
Hamed, G
Hsiao, E. Y
Iwata, I
Kawabata, K. S
Kawai, N
Kikuchi, Y
Kobayashi, N
Kuroda, D
Maehara, H
Matsumoto, E
Mazzali, P. A
Minezaki, T
Mito, H
Miyata, T
Miyazaki, S
Mori, K
Moritani, Y
Morokuma-Matsui, Kana
Morrell, N
Nagao, T
Nakada, Y
Nakata, F
Noma, C
Ohsuga, K
Okada, N
Phillips, M. M
Pian, E
Richmond, M. W
Sahu, D. K
Sako, S
Sarugaku, Y
Shibata, T
Soyano, T
Stritzinger, M. D
Tachibana, Y
Taddia, F
Takaki, K
Takey, Ali
Tarusawa, K
Ui, T
Ukita, N
Urata, Y
Walker, E. S
Yoshii, T
Keywords: Galaxies: active;Galaxies: individual (SDSS J110006.07+442144.3);Galaxies: jets;Galaxies: Seyfert
Issue Date: 1-Oct-2014
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters, Vol. 793, No. 2, L26
Abstract: We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. Spectroscopic observations suggest that this object is likely a narrow-line Seyfert 1 galaxy (NLS1) at z = 0.840, however, with unusually strong narrow emission lines. The estimated black hole mass of ~107 M ☉ implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R sime 4 × 102-3 × 103, which implies the presence of relativistic jets. Rapid and large-amplitude optical variability of the target, reminiscent of that found in a few radio- and γ-ray-loud NLS1s, is therefore produced most likely in a blazar-like core. The 1.4 GHz radio image of the source shows an extended structure with a linear size of about 100 kpc. If SDSS J1100+4421 is a genuine NLS1, as suggested here, this radio structure would then be the largest ever discovered in this type of active galaxies.
Description: Restricted Access
ISSN: 2041-8205
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