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AKARI OBSERVATIONS OF DUSTY TORI OF ACTIVE GALACTIC NUCLEI
SHINKI OYABU,HIDEHIRO KANEDA,Masaya Izuhara,Keisuke Tomita,DAISUKE ISHIHARA,Kimiaki Kawara,Yoshiki Matsuoka 한국천문학회 2017 天文學論叢 Vol.32 No.1
The dusty torus of Active Galactic Nuclei (AGNs) is one of theimportant components for theunification theory of AGNs. The geometry and properties ofthe dusty torus are key factors in understanding the nature of AGNs aswell as the formation and evolution of AGNs. However, they are stillunder discussion. Infrared observation is useful for understanding the dustytorus as thermal emission from hot dust with the dust sublimationtemperature ($\sim$ 1500 K) has been observed in the infrared. We have analyzed infrared spectroscopic data of low-redshift andhigh-redshift quasars, which are luminous AGNs. For the low-redshift quasars, we constructed the spectral energydistributions (SEDs) with AKARI near-infrared and Spitzer mid-infraredspectra and decomposed the SEDs into a power-lawcomponent from the nuclei, silicate features, and blackbody components withdifferent temperatures from the dusty torus. From the decomposition,the temperature of the innermost dusty torus shows the range between900-2000 K. For the high-redshiftquasars, AKARI traced rest-frameoptical and near-infrared spectra of AGNs. Combining with WISE data,we havefound that the temperature of the innermost dusty torus in high redshift quasarsis lower than that in typical quasars. The hydrogen H$\alpha$ emission line from the braod emission line region in thequasars also shows narrow full widthat half maximumof 3000$-$4000 km s$^{-1}$. These results indicatethat the dusty torus and the broad emission line region are more extendedthan those of typical quasars.
Development of a Plasma Control System for Steady-state Operation on QUEST
Makoto Hasegwa,Kazuo Nakamura,Hideki Zushi,Kazuaki Hanada,Akihide Fujisawa,Keisuke Matsuoka,Hiroshi Idei,Yoshihiko Nagashima,Kazutoshi Tokunaga,Shoji Kawasaki,Hisatoshi Nakashima,Aki Higashijima 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A drift error correction technique with machine vision and a real-time equilibrium calculation codehave been developed on the QUEST (Q-shu university experiment with the steady-state sphericaltokamak) for steady-state operation. The drift error caused by the long time-integration of magneticraw signals has to be removed. With a captured image of the plasma’s cross section, the plasma’sposition is identified by use of image filters. The measured magnetic flux values are corrected to thecalculated flux values estimated by using this plasma position. The correction with the capturedimage work as expected in the preliminary result using a flashlight instead of a plasma.
Kenichi Nagaoka,Akihiro Shimizu,Katsumi Ida,Katsunori Ikeda,Katsuyoshi Tsumori,Kazuo Toi,Keisuke Matsuoka,Kiyomasa Watanabe,Masaki Osakabe,Mikiro Yoshinuma,Mitsutaka Isobe,Osamu Kaneko,Shoichi Okamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The characteristics of neutral beam driven current have been investigated in helical devices, which do not need ohmic current to produce a magnetic field configuration. The neutral beam current drive experiments have been performed in a wide range of Zb/Zeff in LHD and CHS. The Z dependence of neutral beam driven current in the region of Zb/Zeff < 1 obtained by neon discharges in LHD agrees with the Ohkawa model. On the other hand, the current driven by neon beam injection in CHS cannot be explained by the Ohkawa model.