1. OISTER Optical and Near-Infrared Monitoring Observations of a Peculiar Radio-Loud Active Galactic Nucleus SDSS J110006.07+442144.3
- Author
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Morokuma, Tomoki, Tanaka, Masaomi, Tanaka, Yasuyuki T., Itoh, Ryosuke, Tominaga, Nozomu, Gandhi, Poshak, Pian, Elena, Mazzali, Paolo, Ohta, Kouji, Matsumoto, Emiko, Shibata, Takumi, Akimoto, Hinako, Akitaya, Hiroshi, Ali, Gamal B., Aoki, Tsutomu, Doi, Mamoru, Ebisuda, Nana, Essam, Ahmed, Fujisawa, Kenta, Fukushima, Hideo, Goda, Shuhei, Gouda, Yuya, Hanayama, Hidekazu, Hashiba, Yasuhito, Hashimoto, Osamu, Hayashida, Kenzo, Hiratsuka, Yuichiro, Honda, Satoshi, Imai, Masataka, Inoue, Kanichiro, Ishibashi, Michiko, Iwata, Ikuru, Izumiura, Hideyuki, Kanda, Yuka, Kawabata, Miho, Kawaguchi, Kenji, Kawai, Nobuyuki, Kokubo, Mitsuru, Kuroda, Daisuke, Maehara, Hiroyuki, Mito, Hiroyuki, Mitsuda, Kazuma, Miyagawa, Ryota, Miyaji, Takeshi, Miyamoto, Yusuke, Morihana, Kumiko, Moritani, Yuki, Morokuma-Matsui, Kana, Murakami, Kotone, Murata, Katsuhiro L., Nagayama, Takahiro, Nakamura, Kazuki, Nakaoka, Tatsuya, Niinuma, Kotaro, Nishimori, Takafumi, Nogami, Daisaku, Oasa, Yumiko, Oda, Tatsunori, Ohshima, Tomohito, Saito, Yoshihiko, Sakata, Shuichiro, Sako, Shigeyuki, Sarugaku, Yuki, Sawada-Satoh, Satoko, Seino, Genta, Sorai, Kazuo, Soyano, Takao, Taddia, Francesco, Takahashi, Jun, Takagi, Yuhei, Takaki, Katsutoshi, Takata, Koji, Tarusawa, Ken'ichi, Uemura, Makoto, Ui, Takahiro, Urago, Riku, Ushioda, Kazutoshi, Watanabe, Jun-ichi, Watanabe, Makoto, Yamashita, Satoshi, Yanagisawa, Kenshi, Yonekura, Yoshinori, and Yoshida, Michitoshi
- Subjects
Astrophysics - Astrophysics of Galaxies ,Astrophysics - High Energy Astrophysical Phenomena - 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 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 $\sim5~\mu$m in the observed frame using the archival WISE data. Given the lack of absorption lines and the steep power-law spectrum of $\alpha_{\nu}\sim-1.4$, where $f_{\nu}\propto\nu^{\alpha_{\nu}}$, 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 $\nu_{\rm{peak}}$ 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., Comment: 22 pages, 7 figures, 2 tables. Accepted for publication in PASJ
- Published
- 2017
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