OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3
Date Issued
2017
Author(s)
Morokuma, Tomoki
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Tanaka, Masaomi
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Tanaka, Yasuyuki T.
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Itoh, Ryosuke
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Tominaga, Nozomu
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Gandhi, Poshak
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•
Mazzali, Paolo
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Ohta, Kouji
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Matsumoto, Emiko
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Shibata, Takumi
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Akimoto, Hinako
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Akitaya, Hiroshi
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Ali, Gamal B.
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Aoki, Tsutomu
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Doi, Mamoru
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Ebisuda, Nana
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Essam, Ahmed
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Fujisawa, Kenta
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Fukushima, Hideo
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Goda, Shuhei
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Gouda, Yuya
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Hanayama, Hidekazu
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Hashiba, Yasuhito
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Hashimoto, Osamu
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Hayashida, Kenzo
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Hiratsuka, Yuichiro
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Honda, Satoshi
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Imai, Masataka
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Inoue, Kanichiro
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Ishibashi, Michiko
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Iwata, Ikuru
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Izumiura, Hideyuki
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Kanda, Yuka
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Kawabata, Miho
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Kawaguchi, Kenji
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Kawai, Nobuyuki
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Kokubo, Mitsuru
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Kuroda, Daisuke
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Maehara, Hiroyuki
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Mito, Hiroyuki
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Mitsuda, Kazuma
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Miyagawa, Ryota
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Miyaji, Takeshi
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Miyamoto, Yusuke
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Morihana, Kumiko
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Moritani, Yuki
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Morokuma-Matsui, Kana
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Murakami, Kotone
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Murata, Katsuhiro L.
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Nagayama, Takahiro
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Nakamura, Kazuki
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Nakaoka, Tatsuya
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Niinuma, Kotaro
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Nishimori, Takafumi
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Nogami, Daisaku
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Oasa, Yumiko
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Oda, Tatsunori
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Ohshima, Tomohito
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Saito, Yoshihiko
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Sakata, Shuichiro
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Sako, Shigeyuki
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Sarugaku, Yuki
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Sawada-Satoh, Satoko
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Seino, Genta
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Sorai, Kazuo
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Soyano, Takao
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Taddia, Francesco
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Takahashi, Jun
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Takagi, Yuhei
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Takaki, Katsutoshi
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Takata, Koji
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Tarusawa, Ken'ichi
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Uemura, Makoto
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Ui, Takahiro
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Urago, Riku
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Ushioda, Kazutoshi
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Watanabe, Jun-ichi
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Watanabe, Makoto
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Yamashita, Satoshi
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Yanagisawa, Kenshi
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Yonekura, Yoshinori
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Yoshida, Michitoshi
Abstract
We present monitoring campaign observations at optical and near-infrared (NIR) wavelengths for a radio-loud active galactic nucleus (AGN) at z = 0.840, SDSS J110006.07+442144.3 (hereafter, J1100+4421), which was identified during a flare phase in late 2014 February. The campaigns consist of three intensive observing runs from the discovery to 2015 March, mostly within the scheme of the OISTER collaboration. Optical-NIR light curves and simultaneous spectral energy distributions (SEDs) are obtained. Our measurements show the strongest brightening in 2015 March. We found that the optical-NIR SEDs of J1100+4421 show an almost steady shape despite the large and rapid intranight variability. This constant SED shape is confirmed to extend to ∼5 μm in the observed frame using the archival WISE data. Given the lack of absorption lines and the steep power-law spectrum of αν ∼ -1.4, where f_{ν }∝ ν ^{α _{ν }}, synchrotron radiation by a relativistic jet with no or small contributions from the host galaxy and the accretion disk seems most plausible as an optical-NIR emission mechanism. The steep optical-NIR spectral shape and the large amplitude of variability are consistent with this object being a low νpeak jet-dominated AGN. In addition, sub-arcsecond resolution optical imaging data taken with Subaru Hyper Suprime-Cam does not show a clear extended component and the spatial scales are significantly smaller than the large extensions detected at radio wavelengths. The optical spectrum of a possible faint companion galaxy does not show any emission lines at the same redshift, and hence a merging hypothesis for this AGN-related activity is not supported by our observations.
Volume
69
Issue
5
Start page
82
Issn Identifier
0004-6264
Ads BibCode
2017PASJ...69...82M
Rights
open.access
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