Study of the magnetic-field structure in the jet of active galactic nuclei using the time variation in polarization
| Project/Area Number |
22540252
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Hiroshima University |
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Principal Investigator |
UEMURA Makoto 広島大学, 宇宙科学センター, 准教授 (50403514)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 光赤外線天文学 / 天文学 / 光学赤外線天文学 / 偏光 / 活動銀河核 / ジェット / 降着円盤 |
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| Research Abstract |
We studied the jet in active galactic nuclei using the time variation in optical polarization. The polarization variation was supposed to be just erratic in past studies with sparse observations. We performed polarimetric observations with a short cadence, and analyzed the data with new techniques we have developed. As a result, we found that 1) polarization variations tend to associate with short flares having a time-scale of days, 2) another polarization component having a long variation time-scale is occasionally present, as well as short flares. Those new findings were reported in 30 papers in refereed journals.
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Report
(5 results)
Research Products
(88 results)
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[Journal Article] Dense Optical and Near-infrared Monitoring of CTA 102 during High State in 2012 with OISTER : Detection of Intra-night "Orphan Polarized Flux Flare"2014
Author(s)
Itoh, R., Tanaka, Yasuyuki T. ; F ukazawa, Yasushi ; Kawabata, Koji S. ; Kawaguchi, Kenji ; Moritani, Yuki ; Takaki, Katsutoshi ; Ue no, Issei ; Uemura, Makoto ; Akit aya, Hiroshi ; Yoshida, Michitoshi ; Ohsugi, Takashi ; Hanayama, Hidekazu ; Miyaji, Takeshi ; Kaw ai, Nobuyuki
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Journal Title
The Astrophysical Journal Letters
Volume: 768(Web)
Issue: 2
Pages: 1-5
DOI
Related Report
Peer Reviewed
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[Journal Article] Minute-scale Rapid Variability of the Optical Polarization in the Narrow-line Seyfert 1 Galaxy PMN J0948+00222013
Author(s)
Itoh, Ryosuke ; Fukazawa, Yasushi ; Tanaka, Yasuyuki T. ; Abe, Yuhei ; Akitaya, Hiroshi ; Arai, Akira ; Hayashi, Masahiko ; Hori, Takafumi ; Isogai, Mizuki ; Izumiura , Hideyuki ; Kawabata, Koji S. ; Kawai, Nobuyuki ; Kuroda, Daisuke ; Miyanoshita, Ryo ; Moritani, Yuki ; Morokuma, Tomoki ; Nagayama, Takahiro ; Nakamoto, Jumpei ; Nakata, Chikako, et al.
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Journal Title
The Astrophysical Journal Letters
Volume: 775(Web)
Issue: 1
Pages: 26-26
DOI
Related Report
Peer Reviewed
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[Journal Article] Photopolarimetric Monitoring of the Blazar BL Lac in the Optical and Near-Infrared Bands : Decay of the Long-Lived Corn ponent2013
Author(s)
Sakimoto, Kiyoshi ; Uemura, Ma koto ; Sasada, Mahito ; Kawabata, Koji S. ; Fukazawa, Yasushi ; Ya manaka, Masayuki ; Itoh, Ryosuk e ; Ohsugi, Takashi ; Yoshida, Mic hitoshi ; Akitaya, Hiroshi ; Sato, Shuji ; Kino, Masaru
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 65(Web)
Issue: 2
Pages: 35-35
DOI
Related Report
Peer Reviewed
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