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OISTER optical and near-infrared monitoring observations of a peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3

OISTER optical and near-infrared monitoring observations of a peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3
OISTER optical and near-infrared monitoring observations of a peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3
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.
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
0004-6264
Morokuma, Tomoki
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Tanaka, Masaomi
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Tanaka, Yasuyuki T.
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Gandhi, Poshak
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Pian, Elena
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Goda, Shuhei
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Hashimoto, Osamu
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Hayashida, Kenzo
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Honda, Satoshi
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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 (2017) OISTER optical and near-infrared monitoring observations of a peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3. Publications of the Astronomical Society of Japan. (doi:10.1093/pasj/psx075).

Record type: Article

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.

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Accepted/In Press date: 13 July 2017
e-pub ahead of print date: 1 September 2017
Keywords: Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena

Identifiers

Local EPrints ID: 414424
URI: http://eprints.soton.ac.uk/id/eprint/414424
ISSN: 0004-6264
PURE UUID: 6e17b2e6-476b-45a2-851b-eb6d99f5a7b0
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 28 Sep 2017 16:31
Last modified: 07 Oct 2020 05:01

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Contributors

Author: Tomoki Morokuma
Author: Masaomi Tanaka
Author: Yasuyuki T. Tanaka
Author: Ryosuke Itoh
Author: Nozomu Tominaga
Author: Poshak Gandhi ORCID iD
Author: Elena Pian
Author: Paolo Mazzali
Author: Kouji Ohta
Author: Emiko Matsumoto
Author: Takumi Shibata
Author: Hinako Akimoto
Author: Hiroshi Akitaya
Author: Gamal B. Ali
Author: Tsutomu Aoki
Author: Mamoru Doi
Author: Nana Ebisuda
Author: Ahmed Essam
Author: Kenta Fujisawa
Author: Hideo Fukushima
Author: Shuhei Goda
Author: Yuya Gouda
Author: Hidekazu Hanayama
Author: Yasuhito Hashiba
Author: Osamu Hashimoto
Author: Kenzo Hayashida
Author: Yuichiro Hiratsuka
Author: Satoshi Honda
Author: Masataka Imai
Author: Kanichiro Inoue
Author: Michiko Ishibashi
Author: Ikuru Iwata
Author: Hideyuki Izumiura
Author: Yuka Kanda
Author: Miho Kawabata
Author: Kenji Kawaguchi
Author: Nobuyuki Kawai
Author: Mitsuru Kokubo
Author: Daisuke Kuroda
Author: Hiroyuki Maehara
Author: Hiroyuki Mito
Author: Kazuma Mitsuda
Author: Ryota Miyagawa
Author: Takeshi Miyaji
Author: Yusuke Miyamoto
Author: Kumiko Morihana
Author: Yuki Moritani
Author: Kana Morokuma-Matsui
Author: Kotone Murakami
Author: Katsuhiro L. Murata
Author: Takahiro Nagayama
Author: Kazuki Nakamura
Author: Tatsuya Nakaoka
Author: Kotaro Niinuma
Author: Takafumi Nishimori
Author: Daisaku Nogami
Author: Yumiko Oasa
Author: Tatsunori Oda
Author: Tomohito Ohshima
Author: Yoshihiko Saito
Author: Shuichiro Sakata
Author: Shigeyuki Sako
Author: Yuki Sarugaku
Author: Satoko Sawada-Satoh
Author: Genta Seino
Author: Kazuo Sorai
Author: Takao Soyano
Author: Francesco Taddia
Author: Jun Takahashi
Author: Yuhei Takagi
Author: Katsutoshi Takaki
Author: Koji Takata
Author: Ken'ichi Tarusawa
Author: Makoto Uemura
Author: Takahiro Ui
Author: Riku Urago
Author: Kazutoshi Ushioda
Author: Jun-ichi Watanabe
Author: Makoto Watanabe
Author: Satoshi Yamashita
Author: Kenshi Yanagisawa
Author: Yoshinori Yonekura
Author: Michitoshi Yoshida

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