OISTER Optical and Near-Infrared Monitoring Observations of a Peculiar Radio-Loud Active Galactic Nucleus SDSS J110006.07+442144.3
Creators: name: Morokuma, Tomoki
name: Tanaka, Masaomi
name: Tanaka, Yasuyuki T.
name: Itoh, Ryosuke
name: Tominaga, Nozomu
name: Gandhi, Poshak
name: Pian, Elena
name: Mazzali, Paolo
name: Ohta, Kouji
name: Matsumoto, Emiko
name: Shibata, Takumi
name: Akimoto, Hinako
name: Akitaya, Hiroshi
name: Ali, Gamal B.
name: Aoki, Tsutomu
name: Doi, Mamoru
name: Ebisuda, Nana
name: Essam, Ahmed
name: Fujisawa, Kenta
name: Fukushima, Hideo
name: Goda, Shuhei
name: Gouda, Yuya
name: Hanayama, Hidekazu
name: Hashiba, Yasuhito
name: Hashimoto, Osamu
name: Hayashida, Kenzo
name: Hiratsuka, Yuichiro
name: Honda, Satoshi
name: Imai, Masataka
name: Inoue, Kanichiro
name: Ishibashi, Michiko
name: Iwata, Ikuru
name: Izumiura, Hideyuki
name: Kanda, Yuka
name: Kawabata, Miho
name: Kawaguchi, Kenji
name: Kawai, Nobuyuki
name: Kokubo, Mitsuru
name: Kuroda, Daisuke
name: Maehara, Hiroyuki
name: Mito, Hiroyuki
name: Mitsuda, Kazuma
name: Miyagawa, Ryota
name: Miyaji, Takeshi
name: Miyamoto, Yusuke
name: Morihana, Kumiko
name: Moritani, Yuki
name: Morokuma-Matsui, Kana
name: Murakami, Kotone
name: Murata, Katsuhiro L.
name: Nagayama, Takahiro
name: Nakamura, Kazuki
name: Nakaoka, Tatsuya
name: Niinuma, Kotaro
name: Nishimori, Takafumi
name: Nogami, Daisaku
name: Oasa, Yumiko
name: Oda, Tatsunori
name: Ohshima, Tomohito
name: Saito, Yoshihiko
name: Sakata, Shuichiro
name: Sako, Shigeyuki
name: Sarugaku, Yuki
name: Sawada-Satoh, Satoko
name: Seino, Genta
name: Sorai, Kazuo
name: Soyano, Takao
name: Taddia, Francesco
name: Takahashi, Jun
name: Takagi, Yuhei
name: Takaki, Katsutoshi
name: Takata, Koji
name: Tarusawa, Ken'ichi
name: Uemura, Makoto
name: Ui, Takahiro
name: Urago, Riku
name: Ushioda, Kazutoshi
name: Watanabe, Jun-ichi
name: Watanabe, Makoto
name: Yamashita, Satoshi
name: Yanagisawa, Kenshi
name: Yonekura, Yoshinori
name: Yoshida, Michitoshi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 February, 2014. The campaigns consist of three intensive observing runs from the discovery to March, 2015, 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 March, 2015. 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 $\sim5~μ$m in the observed frame using the archival WISE data. Given the lack of absorption lines and the steep power-law spectrum of $α_ν\sim-1.4$, where $f_ν\proptoν^{α_ν}$, 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 $ν_{\rm{peak}}$ jet-dominated AGN. In addition, sub-arcsec 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.
description: 22 pages, 7 figures, 2 tables. Accepted for publication in PASJ