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AKARI-FIS POINT SOURCE CATALOGUE: CURRENT STATUS AND FUTURE PLAN
Yamamura, Issei,Makiuti, Sin'itirou,Ikeda, Norio,Koga, Tatsuya,Yoshino, Akira,Yamauchi, Chisato The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
The current status of the AKARI-FIS Point Source Catalogue is reported. The first version of the Bright Source Catalogue has been in public since March 2010 and used extensively in the various fields in astronomy. The second version of the Bright Source Catalogue and the first version of the Faint Source Catalogue are currently under development. The revised Bright Source Catalogue is expected to have improved completeness, reliability, and accuracy compared to the current version. The Faint Source Catalogue will have a scan-density dependent detection limit and will enable much deeper exploration of the sky especially in the high-ecliptic latitude regions. Both catalogues will be available in a year time scale.
THE AKARI FIR ALL-SKY POINT SOURCE CATALOGUES: IMPROVEMENT ACTIVITIES
Sinitirou Makiuti,ISSEI YAMAMURA,TATSUYA KOGA,TATSUYA NAKADA 한국천문학회 2017 天文學論叢 Vol.32 No.1
The first version of the \textit{AKARI} far-infrared All-Sky Bright Source Catalogue (BSC ver.1) was released to public in March 2010. It has been widely used for various astrophysical researches. We are continuing efforts to produce the next edition. The new version is expected to be improved in accuracy and reliability, as well as its volume. Many improvements to the next version are in progress. The time-line signal is being re-examined throughout the entire data processing. Correction processes for signal linearity and detector responsivity, and procedure for masking signal anomaly are revised. The source extraction process is further tuned and operating parameters will be optimized. These bring better reliability of the source detection and possibly an increase of source numbers. The position accuracy is expected to be improved. Systematic position error seen around the Galactic plane will also be corrected. We also plan to deliver the Faint Source Catalogue version 1.
THE AKARI PROJECT: LEGACY AND DATA PROCESSING STATUS
TAKAO NAKAGAWA,ISSEI YAMAMURA 한국천문학회 2017 天文學論叢 Vol.32 No.1
This paper provides an overview of the AKARI mission,which was the first Japanese satellitededicated to infrared astronomy. The \textit{AKARI} satellite was launched in 2006, and performed both an all-sky survey and pointedobservations during its 550 days in the He-cooled mission phases (Phases 1 and 2). After the He ranout, we continued near-infrared observations with mechanical cryocoolers (Phase 3). Due to a failureof its power supply, AKARI was turned off in 2011.
A SIGNATURE OF CHROMOSPHERIC ACTIVITY IN BROWN DWARFS: A RECENT RESULT FROM NIRLT MISSION PROGRAM
Satoko Sorahana,Takeru K. Suzuki,ISSEI YAMAMURA 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present the latest results from the Mission Program NIRLT (PI: I.Yamamura), the near-infrared spectroscopy of brown dwarfs using the AKARI/IRC grism mode with the spectral resolution of $\sim120$. The near-infrared spectra in the wavelength range between 2.5 and 5.0~$\mu$m are especially important to study the brown dwarf atmospheres because of the presence of major molecular bands, including CH$_4$ at 3.3~$\mu$m, CO$_2$ at 4.2~$\mu$m, CO at 4.6 ~$\mu$m, and H$_2$O around 2.7~$\mu$m. We observed 27 sources, and obtained 16 good spectra. Our model fitting reveals deviations between theoretical model and observed spectra in this wavelength range, which may be attributed to the physical condition of the upper atmosphere. The deviations indicate additional heating, which we hypothesize to be due to chromospheric activity. We test this effect by modifying the brown dwarf atmosphere model to artificially increase the temperature of the upper atmosphere, and compare the revised model with observed spectra of early- to mid-L type objects with H$\alpha$ emission. We find that the chemical structure of the atmosphere changes dramatically, and the heating model spectra of early-type brown dwarfs can be considerably improved to match the observed spectra. Our result suggests that chromospheric activity is essential to understand early-type brown dwarf atmospheres.
THE SYNERGY OF LARGE AREA SURVEYS WITH AKARI AND HERSCHEL
Pearson, Chris,Serjeant, Stephen,Sedgwick, Chris,White, Glenn J.,Matsuhara, Hideo,Takagi, Toshinobu,Nagisa, Oi,Murata, Kazumi,Nakagawa, Takao,Yamamura, Issei The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
The Herschel Space Observatory is the European Space Agency's state of the art infrared space telescope launched into space on 14 May 2009, covering the wavelength range from 70-700 microns with 3 instruments SPIRE, PACS and HIFI. Large area surveys are being carried out by Herschel in the AKARI legacy fields at the North and South Ecliptic Poles and the AKARI All-Sky Survey provides additional synergy with the largest survey with Herschel, H-ATLAS, covering more than 500 square degrees. This paper reports on some of the early results of these synergies between Herschel and AKARI including the first comparison of the AKARI All-Sky Survey number counts with the deeper Herschel surveys.
Observing Simulations of Far-Infrared Surveyor on-board ASTRO-F : Extragalactic Point Sources
Woong-Seob Jeong,Soojong Pak,Hyung-Mok Lee,Sam Kim,Jungjoo Sohn,Mikako Matsuura,Takao Nakagawa,Issei Yamamura,Shuji Matsuura,Mitsunoby Kawada,Hidehiro Kaneda,Hiroshi Murakami,Hiroshi Shibai 한국우주과학회 2000 한국우주과학회보 Vol.9 No.2
Observing Simulations of Far-Infrared Surveyor on-board ASTRO-F: Extragalactic Point Sources
Woong-Seob Jeong,Soojong Pak,Hyung Mok Lee,Sam Kim,Jungjoo Sohn,Mikako Matsuura,Takao Nakagawa,Issei Yamamura,Shujl Matsuura,Mitsunobu Kawada,Hidehiro Kaneda,Hiroshi Murakami,Hiroshi Shibai 한국천문학회 2000 天文學會報 Vol.25 No.2