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PROBING STAR FORMATION IN ULTRALUMINOUS INFRARED GALAXIES USING AKARI NEAR-INFRARED SPECTROSCOPY
Kenichi Yano,TAKAO NAKAGAWA,Naoki Isobe,MAI SHIRAHATA 한국천문학회 2017 天文學論叢 Vol.32 No.1
We performed systematic observations of the \ion{H}{i} Br$\alpha$ line (4.05 $\mu$m)in 51 nearby (z<0.3) ultraluminous infrared galaxies(ULIRGs), using AKARI near-infrared spectroscopy. The Br$\alpha$ line is predicted to be the brightest among the \ion{H}{i} recombination linesin ULIRGs with visual extinction higher than 15 mag. We detected the Br$\alpha$ line in 33 ULIRGs. In these galaxies, the relative contribution ofstarburst to the total infrared luminosity ($L_\mathrm{IR}$)is estimated on the basis of the ratio ofthe Br$\alpha$ line luminosity ($L_{\mathrm{Br}\alpha}$) to $L_\mathrm{IR}$. The mean $L_{\mathrm{Br}\alpha}/L_\mathrm{IR}$ ratioin LINERs or Seyfertsis significantly lower (~ 50%)than that in \ion{H}{ii} galaxies. This result indicates that active galactic nuclei contributesignificantly (~ 50%) to $L_\mathrm{IR}$ in LINERs,as well as Seyferts. We also estimate the absolutecontribution of starburst to $L_\mathrm{IR}$ using the ratio of star formation rates (SFRs)derived from $L_{\mathrm{Br}\alpha}$ (SFR$_{\mathrm{Br}\alpha}$) and those neededto explain $L_\mathrm{IR}$ (SFR$_\mathrm{IR}$). The mean SFR$_{\mathrm{Br}\alpha}/$SFR$_\mathrm{IR}$ratio is only 0.33 even in\ion{H}{ii} galaxies,where starburst is supposed to dominate the luminosity. We attribute this apparently low SFR$_{\mathrm{Br}\alpha}/$SFR$_\mathrm{IR}$ratio to the absorption ofionizing photons by dust within \ion{H}{ii} regions.
야노켄이치 ( Yano Kenichi ) 연세대학교 언어정보연구원 2009 언어사실과 관점 Vol.23 No.-
This research analyzes the process and its content of compilation of the Korean dictionary which was developed to be a national project in North Korea, and it also investigates the normative and political characteristics through this analysis of the Korean dictionary. After introducing and describing the representative Korean dictionary by time period, it will define the roles and political influences of the dictionaries. Furthermore, regarding the description of the dictionary, the study will exemplify the entry and its meaning that is influenced by North Korea`s language policy, and lastly it will examine how the reconstruction of words can be applied in the entry `suryong`.
INFRARED – X-RAY CONNECTION IN NEARBY ACTIVE GALACTIC NUCLEI; AKARI AND MAXI RESULTS
Naoki Isobe,TAKAONAKAGAWA,Kenichi Yano,Shunsuke Baba,SHINKI OYABU,Yoshiki Toba,Yoshihiro Ueda,Taiki Kawamuro 한국천문학회 2017 天文學論叢 Vol.32 No.1
Combining the AKARI Point Source Catalog andthe 37-month Monitor of All-sky X-ray Image (MAXI) catalog,the infrared and X-ray properties of nearby active galactic nucleiwere investigated. The 37-month MAXI catalog tabulates 100 nearby Seyfert galaxies,73 of which are categorized into Seyfert I galaxies. Among these Seyfert galaxies,69 ones were found to have an AKARI infrared counterpart. For the Seyfert I galaxies in this sample,a well-known correlation was found between the infrared and X-ray luminosities. However, the observed X-ray luminosity of the Seyfert II galaxiestends to be lower for the infrared luminosity than the Seyfert I galaxies. This suggests thatthe X-ray absorption is significant in the Seyfert II galaxies. The Seyfert II galaxies seem to havea bimodal distribution of the IR color between $18~\mu$m and $90~\mu$m. Especially, a large fraction of the Seyfert II galaxiesexhibits a redder IR color than the Seyfert I galaxies. A possible origin of the redder IR color is briefly discussed,in relation to the star formation activity in the host galaxy,and to the X-ray absorption.
STUDY OF SPECTRAL ENERGY DISTRIBUTION OF GALAXIES WITH PRINCIPAL COMPONENT ANALYSIS
Chihiro Kochi,TAKAO NAKAGAWA,Naoki Isobe,MAI SHIRAHATA,Kenichi Yano,Shunsuke Baba 한국천문학회 2017 天文學論叢 Vol.32 No.1
We performed Principle Component Analysis\,(PCA) over 264 galaxies in the {\it IRAS} Revised Bright Galaxy \blue{Sample \citep{Sanders2003}} using 12, 25, 60 and 100\,$\mu$m flux data observed by {\it IRAS} and 9, 18, 65, 90 and 140\,$\mu$m flux data observed by {\it AKARI}. We \blue{found} that (i)the first principle component \blue{was} largely contributed by infrared to visible flux ratio, (ii)the second principal component \blue{was} largely contributed by the flux ratio between {\it IRAS} and {\it AKARI}, (iii)the third principle component \blue{was} largely contributed by infrared colors.
AN EXTENSION OF A RELIABLE WAVELENGTH COVERAGE OF THE AKARI NG GRISM MODE
Shunsuke Baba,TAKAO NAKAGAWA,NAIKI ISOBE,MAI SHIRAHATA,YOUICHI OHYAMA,KENICHI YANO,CHIHIRO KOCHI 한국천문학회 2017 天文學論叢 Vol.32 No.1
The Infrared Camera onboard the \textit{AKARI} satellite carried out spectroscopic observations with a grism mode named \textit{NG}, whose wavelength coverage was 2.5--5.0~$\mu$m. We reinvestigate the current flux calibration for the \textit{NG} grism mode, with which calculated flux density implausibly decreases at 4.9~$\mu$m especially for red objects due to the second-order light contamination. We perform a new spectral response calibration using blue and red standard objects simultaneously. New response curves which contain both the first- and second-order light are able to separate each contribution consistently and useful for studies of red objects such as CO ro-vibrational absorption in active galactic nuclei.