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23 April 2024

» arxiv » 1409.1309

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Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-Loud Narrow-Line Seyfert 1 Galaxy?
Masaomi Tanaka ; Tomoki Morokuma ; Ryosuke Itoh ; Hiroshi Akitaya ; Nozomu Tominaga ; Yoshihiko Saito ; Lukasz Stawarz ; Yasuyuki T. Tanaka ; Poshak Gandhi ; Gamal Ali ; Tsutomu Aoki ; Carlos Contreras ; Mamoru Doi ; Ahmad Essam ; Gamal Hamed ; Eric Y. Hsiao ; Ikuru Iwata ; Koji S. Kawabata ; Nobuyuki Kawai ; Yuki Kikuchi ; Naoto Kobayashi ; Daisuke Kuroda ; Hiroyuki Maehara ; Emiko Matsumoto ; Paolo A. Mazzali ; Takeo Minezaki ; Hiroyuki Mito ; Takashi Miyata ; Satoshi Miyazaki ; Kensho Mori ; Yuki Moritani ; Kana Morokuma-Matsui ; Nidia Morrell ; Tohru Nagao ; Yoshikazu Nakada ; Fumiaki Nakata ; Chinami Noma ; Ken Ohsuga ; Norio Okada ; Mark M. Phillips ; Elena Pian ; Michael W. Richmond ; Devendra Sahu ; Shigeyuki Sako ; Yuki Sarugaku ; Takumi Shibata ; Takao Soyano ; Maximilian D. Stritzinger ; Yutaro Tachibana ; Francesco Taddia ; Katsutoshi Takaki ; Ali Takey ; Ken'ichi Tarusawa ; Takahiro Ui ; Nobuharu Ukita ; Yuji Urata ; Emma S. Walker ; Taketoshi Yoshii ;
Date:	4 Sep 2014
Abstract:	We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey (KISS). 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 ~ 10^7 Msun implies bolometric nuclear luminosity close to the Eddington limit. SDSS J1100+4421 is also extremely radio-loud, with a radio loudness parameter of R ~ 4 x 10^2 - 3 x 10^3, 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 gamma-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.
Source:	arXiv, 1409.1309
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