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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Variable optical polarization during high state in γ-ray loud, narrow-line Seyfert 1 galaxy 1H0323+342
Publications of the Astronomical Society of Japan, Volume 66, No. 6, Article 108, Year 2013
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Description
We present results of optical polarimetric and multi-band photometric observations for γ-ray loud, narrow-line Seyfert1 galaxy 1H0323+342. This object has been monitored by the 1.5-m Kanata telescope since 2012 September, but following a γ-ray flux enhancement detected by Fermi Large Area Telescope (Fermi-LAT) on MJD 56483 (2013 July 10), dense follow-up was performed by 10 0.5-2.0-m telescopes in Japan over one week. The 2-yr RC-band light curve showed clear brightening corresponding to the γ-ray flux increase, and then decayed gradually. The high state as a whole lasted for ∼20d, during which we clearly detected optical polarization from this object. The polarization degree (PD) of the source increased from 0%-1% in quiescence to ∼3% at maximum and then declined to the quiescent level, with the duration of the enhancement being less than 10d. The moderate PD around the peak allowed us to precisely measure the daily polarization angle (PA). As a result, we found that the daily PAs were almost constant and aligned to the jet axis, suggesting that the magnetic field direction at the emission region is transverse to the jet. This implies either a presence of helical/toroidal magnetic field or transverse magnetic field compressed by shock(s). We also found small-amplitude intra-night variability during the 2-hr continuous exposure on a single night. We discuss these findings based on the turbulent multi-zone model recently advocated by Marscher (2014, ApJ, 780, 87). Optical to ultraviolet (UV) spectrum showed a rising shape in the higher frequency and the UV magnitude measured by Swift/UVOT (UV and Optical Telescope) was steady even during the flaring state, suggesting that thermal emission from accretion disk is dominant in that band. © 2014 © The Author 2014. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved.
Authors & Co-Authors
Itoh, Ryosuke
Japan, Higashihiroshima
Hiroshima University
Tanaka, Yasuyuki T.
Japan, Higashihiroshima
Hiroshima University
Akitaya, Hiroshi
Japan, Higashihiroshima
Hiroshima University
Uemura, Makoto
Japan, Higashihiroshima
Hiroshima University
Fukazawa, Yasushi
Japan, Nagoya
Nagoya University
Arai, Akira
Japan, Higashihiroshima
Hiroshima University
Hanayama, Hidekazu
Japan, Kyoto
Kyoto University
Hashimoto, Osamu
Japan, Tokyo
The University of Tokyo
Izumiura, Hideyuki
Japan, Tokyo
Tokyo Institute of Technology
Kanda, Yuka
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Kawabata, Koji S.
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Kawaguchi, Kenji
Unknown Affiliation
Kawai, Nobuyuki
Japan, Nagoya
Nagoya University
Kinugasa, Kenzo
Japan, Sapporo
Hokkaido University
Kuroda, Daisuke
Japan, Higashihiroshima
Hiroshima University
Miyaji, Takeshimiyaji
Japan, Tokyo
The University of Tokyo
Moritani, Yuuki
Japan, Higashihiroshima
Hiroshima University
Morokuma, Tomoki
Japan, Higashihiroshima
Hiroshima University
Murata, Katsuhiro L.
Japan, Chofu
Japan Aerospace Exploration Agency
Nagayama, Takahiro
Japan, Kobe
University of Hyogo
Oasa, Yumiko
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Ohshima, Tomohito
Unknown Affiliation
Ohsugi, Takashi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Saito, Yoshihiko
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Sakata, Shuuichiro
Japan, Tokyo
Tokyo Institute of Technology
Sasada, Mahito
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Sekiguchi, Kazuhiro
Japan, Tokyo
The University of Tokyo
Takagi, Yuhei
Japan, Nagoya
Nagoya University
Takahashi, Jun
Japan, Kagoshima
Kagoshima University
Takaki, Katsutoshi
Japan, Higashihiroshima
Hiroshima University
Ui, Takahiro
Japan, Saitama
Saitama University
Watanabe, Makoto
Japan, Sapporo
Hokkaido University
Yamanaka, Masayuki
Japan, Kobe
Konan University
Yamashita, Satoshi
Japan, Higashihiroshima
Hiroshima University
Yoshida, Michitoshi
Japan, Kyoto
Kyoto University
Statistics
Citations: 12
Authors: 35
Affiliations: 12
Identifiers
Doi:
10.1093/pasj/psu095
ISSN:
00046264
Research Areas
Environmental
Study Design
Cohort Study