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- 저자 : Kimiaki Kawara (검색결과 1 건)
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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.
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