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Mori, T.I.,Sakon, I.,Onaka, T.,Umehata, H.,Kaneda, H.,Ohsawa, R. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We present the results of the near-infrared (NIR) to mid-infrared (MIR) slit spectroscopic observations of the diffuse emission toward nine positions in the nearby irregular galaxy Large Magellanic Cloud (LMC) with the Infrared Camera (IRC) on board AKARI. The unique characteristic of AKARI/IRC provides a great opportunity to analyze variations in the unidentified infrared (UIR) bands based on continuous spectra from 2.5 to $13.4{\mu}m$ of the same slit area. The observed variation of $I_{3.3}/I_{11.3}$ suggests destruction of small-sized UIR band carriers, polycyclic aromatic hydrocarbons (PAHs) in harsh environments. This result demonstrates that the UIR $3.3{\mu}m$ band provides us powerful information on the excitation conditions and/or the size distribution of PAHs, which is of importance for understanding the evolutionary process of hydrocarbon grains in the Universe. It also suggests a new diagnostic diagram of two band ratios, such as $I_{3.3}/I_{11.3}$ versus $I_{7.7}/I_{11.3}$, for the interstellar radiation conditions. We discuss on the applicability of the diagnostic diagram to other astronomical objects, comparing the LMC results with those observed in other galaxies such as NGC 6946, NGC 1313, and M51.
THE CENTRAL REGION OF THE BARRED SPIRAL GALAXY NGC 1097 PROBED BY AKARI NEAR-INFRARED SPECTROSCOPY
Kondo, T.,Kaneda, H.,Oyabu, S.,Ishihara, D.,Mori, T.,Yamagishi, M.,Onaka, T.,Sakon, I.,Suzuki, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
With AKARI, we carried out near-infrared spectroscopy of the nearby barred spiral galaxy, NGC 1097, categorized as Seyfert 1 with a circumnuclear starburst ring. Our observations mapped the galactic center region. As a result, we obtain the spatial distributions of the polycyclic aromatic hydrocarbon $3.3{\mu}m$ and the aliphatic hydrocarbon $3.4-3.6{\mu}m$ emission. The former is detected from all the observed regions and the latter is enhanced near the bar connecting the ring with the nucleus. In addition, we detect absorption features due to $H_2O$ ice and CO/SiO at the ring and the galactic center, while we detect the hydrogen recombination line $Br{\alpha}$ only from the ring. Hence the observed spectra change dramatically within the central 1 kpc region.
AKARI MID- TO FAR-INFRARED OBSERVATIONS OF DIFFUSE GALACTIC EMISSION
Sakon, I.,Onaka, T.,Mori, T.I.,Ohsawa, R.,Doi, Y.,Okada, Y.,Kaneda, H.,Ootsubo, T. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We have collected dozens of mid-infrared spectra showing UIR bands from diffuse Galactic emitting regions with the AKARI's Infrared Camera (IRC) onboard AKARI, as part of the ISMGN Mission Program. The datasets cover various directions in the inner Galactic Plane ($|l|$ < 70 deg), in the outer Galactic Plane ($|l|$ > 70 deg), and in the off-Plane ($|b|$ > 2 deg). The variations in the UIR band ratios are examined in terms of the radiation environments judged from the far-infrared ($50-170{\mu}m$) spectral energy distribution (SED) made with AKARI/FIS All Sky Survey data at each slit position where mid-IR spectra were obtained. We have found that the band ratios of $6.2{\mu}m/11.2{\mu}m$ and $7.7{\mu}m/11.2{\mu}m$ toward the inner Galaxy are systematically higher than those toward the outer Galaxy and off the Galactic plane. Likely causes of the variations in properties of UIR bands in diffuse emission on a Galactic scale are discussed in this paper.
INVESTIGATION OF PAHs IN GALACTIC PLANETARY NEBULAE WITH THE AKARI/IRC AND THE SPITZER/IRS
Ohsawa, R.,Onaka, T.,Sakon, I.,Mori, T.I.,Yamamura, I.,Matsuura, M.,Kaneda, H.,Bernard-Salas, J.,Berne, O.,Joblin, C. The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
Polycyclic aromatic hydrocarbons (PAHs) in Galactic planetary nebulae (PNe) are investigated by means of the unidentified infrared (UIR) bands. Continuous near- to mid-infrared spectra of PNe are obtained with the AKARI/IRC and the Spitzer/IRS. All 19 PNe in the present study show prominent dust emissions and we investigate the variation in the intensity ratios among the UIR bands. The ionization fraction and the size distribution of PAHs in PNe are derived using the UIR band ratios. We find that the ionization fraction of PAHs in PNe is around 0.0-0.6 and that small PAHs are scarce. The present result indicates a systematic trend of the $3.4{\mu}m$ aliphatic feature to become weak as the PAH ionization fraction increases.
A. Ya. Faenov,Y. Fukuda,T. A. Pikuz,M. Kando,H. Kotaki,T. Homma,K. Kawase,T. Kameshima,I. Daito,Y. Hayashi,H. Sakaki,P. Bolton,A. Pirozhkov,A. Yogo,M. Tampo,T. Nakamura,M. Mori,K. Ogura,T. Kawachi,H. 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
The interaction of short intense laser pulses with clusters enhanced the absorption of the incident laser light compared to solid targets. Due to the increased absorption, these targets are heated significantly, leading to enhanced emission of X-rays and generation of multiply charged ions with kinetic energies from tens of keV to tens of MeV. Possible applications of these targets include an X-ray source for microscopy or lithography and an ion source for table-top accelerators. The recent results obtained in Kansai Photon Science Institute for the short, moderate intensity, ~5 × 1017W/cm2, laser pulses interactions with large clusters, are presented. Applications of a femtosecondlaser-plasma cluster-based source for different types of nanostructure imaging are discussed.
Using EOG Signal to Control Robot Manipulator
M.I. Rusydi,Y. Mori,T. Okamoto,M. Sasaki,S. Ito 한국재활복지공학회 2012 한국재활복지공학회 학술대회논문집 Vol.2012 No.11
Electro-oculograph (EOG) is one of the biosignal that can be used to improve life quality in human machine interface area. EOG occurs as the eye activities change the magnitude of potential between cornea and retina. This signal was used to control robot manipulator in four directions (up, down, left and right). To record this phenomenon we used NF Instrument with head box to amplify the signal and processor box to process digital filter. Combination of 3 digital filter, 1.6 High Pass Filter, 60 Hz Low Pass Filter and 60 Hz Ham Filter added by 6 Hz Low Pass Filter gave neat signal until the difference among the eye movement could be distinguished. This is a real time system because we could detect when a signal comes and send it to the robot manipulator system through Arduino microcontroller. The determination of the signal emersion was successfully calculated by the combination of wavelet transform with scale = 1 and translation = 0.031 and garbor filter with O=1. Since the average accuracy of the system is more than 90% so we can use this method for some extend application later.
NEAR-INFRARED PAH FEATURES IN GALACTIC PLANETARY NEBULAE
R. Ohsawa,O.ONAKA,I.SAKON,T.I. MORI,H.KANEDA,M.MATSUURA 한국천문학회 2017 天文學論叢 Vol.32 No.1
Polycyclic aromatic hydrocarbons (PAHs) are considered to be carriers of the unidentified infrared bands, which are ubiquitously observed in the Universe. PAHs are mainly formed around evolved carbon-rich stars and injected into interstellar space. Planetary nebulae (PNe), a late stage of low- and intermediate stellar mass evolution, are suitable objects to investigate the formation and evolution of PAHs. The shortest PAH feature is located in 3.3$\,\mu$m, which is important to examine the excitation and size distribution of PAHs. While the number of samples had been limited before, the high sensitivity of \textit{AKARI}/IRC has drastically increased the number of samples. We obtained the 2--5$\,\mu$m spectra of Galactic PNe with \textit{AKARI}/IRC and compiled a near-infrared spectral catalog, containing 73 PNe. We investigate the detection rate and the evolution of the PAH features. The characteristics of the catalog are illustrated and the origin of the evolution of the PAH features is discussed.