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AKARI OBSERVATIONS OF THE INTERSTELLAR MEDIUM
Onaka, Takashi The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
AKARI has 4 imaging bands in the far-infrared (FIR) and 9 imaging bands that cover the near-infrared (NIR) to mid-infrared (MIR) contiguously. The FIR bands probe the thermal emission from sub-micron dust grains, while the MIR bands observe emission from stochastically-heated very small grains and the unidentified infrared (UIR) band emissions from carbonaceous materials that contain aromatic and aliphatic bonds. The multi-band characteristics of the AKARI instruments are quite efficient to study the spectral energy distribution of the interstellar medium, which always shows multi-component nature, as well as its variations in the various environments. AKARI also has spectroscopic capabilities. In particular, one of the onboard instruments, Infrared Camera (IRC), can obtain a continuous spectrum from 2.5 to $13{\mu}m$ with the same slit. This allows us to make a comparative study of the UIR bands in the diffuse emission from the 3.3 to $11.3{\mu}m$ for the first time. The IRC explores high-sensitivity spectroscopy in the NIR, which enables the study of interstellar ices and the UIR band emission at $3.3-3.5{\mu}m$ in various objects. Particularly, the UIR bands in this spectral range contain unique information on the aromatic and aliphatic bonds in the band carriers. This presentation reviews the results of AKARI observations of the interstellar medium with an emphasis on the observations of the NIR spectroscopy.
PROCESSING OF INTERSTELLAR MEDIUM AS DIVULGED BY AKARI
TAKASHI ONAKA,TAMAMI I. MORI,RYOU OHSAWA,ITSUKI SAKON,AARON C. BELL,MARK HAMMONDS,TAKASHI SHIMONISHI,DAISUKE ISHIHARA,HIDEHIRO KANEDA,YOKO OKADA,MASAHIRO TANAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
A wide spectral coverage from near-infrared (NIR) to far-infrared (FIR) of {\it AKARI} both for imaging and spectroscopy enablesus to efficiently study the emission from gas and dust in the interstellar medium (ISM). In particular, the Infrared Camera(IRC) onboard {\it AKARI}offers a unique opportunity to carry out sensitive spectroscopy in the NIR (2--5\,$\mu$m) for the first time from a spaceborn telescope. This spectral range contains a number of important dust bands and gas lines, such as the aromatic and aliphatic emissionbands at 3.3 and 3.4--3.5\,$\mu$m, H$_2$O and CO$_2$ ices at 3.0 and 4.3\,$\mu$m, CO, H$_2$, and \ion{H}{I} gas emission lines. In this paper we concentrate on the aromatic and aliphatic emission and ice absorption features. The balance between dust supply and destruction suggests significant dust processing takingplace as well as dust formation in the ISM. Detailed analysis of the aromatic and aliphatic bands of {\it AKARI} observations for a number of\ion{H}{ii} regions and \ion{H}{ii} region-like objectssuggests processing of carbonaceous dust in the ISM. The ice formation process canalso be studied with IRC NIR spectroscopy efficiently. In this review, dust processing in the ISM divulged by recentanalysis of {\it AKARI} data is discussed.
DATA REDUCTION OF AKARI/IRC SPECTROSCOPIC OBSERVATIONS
Fumihiko Usui,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
AKARI performed about 10,000 spectroscopic observations with the Infrared Camera (IRC) during its mission phase. These IRC observations provide unique spectroscopic data at near- and mid-infrared wavelengthsfor studies of the next few decades because of its high sensitivity and unique wavelength coverage. In this paper, we present the current status of the activity for improving the IRC spectroscopicdata reduction process, including the toolkit and related data packages, and also discussthe goal of this project.
SPECTRAL EVOLUTION OF NOVAE IN THE NEAR-INFRARED BASED ON AKARI OBSERVATIONS
ITSUKI SAKON,TAKASHI ONAKA,Fumihiko Usui,SAYAKA SHIMAMOTO,RYOU OHSAWA,Takehiko Wada,Hideo Matsuhara,AKIRA ARAI 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have carried out the near-infrared spectroscopic observations of recent classical novae (e.g., V2468Cyg, V1280Sco) within a few years from the outburst with AKARI as a part of AKARI Open Time Observing Program for Phase 3-II "Spectral Evolution of Novae in the Near-Infrared based on AKARI Observations (Proposal ID: SENNA)". The homogeneous datasets of near-infrared spectra from 2.5 $\mu$m to 5 $\mu$m with AKARI/IRC collected in this program are useful to infer the physical conditions of the shell formed by the ejected materials, to examine the chemical properties of the ejecta gas, and to examine the properties of dust formed in the nova ejecta.
THE NEXT-GENERATION INFRARED ASTRONOMY MISSION SPICA UNDER THE NEW FRAMEWORK
NAKAGAWA, TAKAO,SHIBAI, HIROSHI,ONAKA, TAKASHI,MATSUHARA, HIDEO,KANEDA, HIDEHIRO,KAWAKATSU, YASUHIRO The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We present the current status (as of August 2014) of SPICA (Space Infrared Telescope for Cosmology and Astrophysics), which is a mission optimized for mid- and far-infrared astronomy with a cryogenically cooled 3m-class telescope. SPICA is expected to achieve high spatial resolution and unprecedented sensitivity in the mid- and far-infrared, which will enable us to address a number of key problems in present-day astronomy, ranging from the star-formation history of the universe to the formation of planets. We have carried out the "Risk Mitigation Phase" activity, in which key technologies essential to the realization of the mission have been extensively developed. Consequently, technical risks for the success of the mission have been significantly mitigated. Along with these technical activities, the international collaboration framework of SPICA has been revisited, which resulted in la arger contribution from ESA than that in the original plan. To enable the ESA participation under the new framework, a SPICA proposal to ESA is under consideration as a medium-class mission under the framework of the ESA Cosmic Vision. The target launch year of SPICA under the new framework is the mid-2020s.
Ita, Yoshifusa,Kato, Daisuke,Onaka, Takashi,AKAR.LMC survey team The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We observed an area of 10 $deg^2$ of the Large Magellanic Cloud using the Infrared Camera (IRC) onboard AKARI. The observations were carried out using five imaging filters (3, 7, 11, 15, and $24{\mu}m$) and the prism disperser ($2-5{\mu}m$, ${\lambda}/{\Delta}{\lambda}{\sim}20$) equipped in the IRC. This paper presents an outline of the survey project and also describes very briefly the newly compiled near- to mid-infrared point source catalog. The $10{\sigma}$ limiting magnitudes are 17.9, 13.8, 12.4, 9.9, and 8.6 mag at 3.2, 7, 11, 15 and $24{\mu}m$, respectively. The photometric accuracy is estimated to be about 0.1 mag at $3.2{\mu}m$ and 0.06 - 0.07 mag in the other bands. The position accuracy is 0.3" at 3.2, 7 and $11{\mu}m$ and 1.0" at 15 and $24{\mu}m$. The sensitivities at 3.2, 7, and $24{\mu}m$ are roughly comparable to those of the Spitzer SAGE LMC point source catalog, while the AKARI catalog provides the data at 11 and $15{\mu}m$, covering the near- to mid-infrared spectral range continuously.