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RISS 인기검색어
- 검색키워드
- 저자 : Egusa, Fumi (검색결과 3 건)
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INTERSTELLAR DUST IN M51 FROM IRC IMAGES
Egusa, Fumi,Sakon, I.,Onaka, T.,Matsuhara, H.,Arimatsu, K.,Suzuki, T.,Wada, T.,The IRC team, The IRC team The Korean Astronomical Society 2012 天文學論叢 Vol.27 No.4
We present the IRC images of M51, a pair of interacting galaxies. Given the high angular resolution (7.4") and the wide field of view (~ 10') covering almost the entire M51 system, we investigate dust properties and their connection to the spiral arm structure. We have applied image-filtering processes including the wavelet analysis to the N3 image, which traces the total stellar mass best among the IRC bands. From this filtered image, the center, arm, and interarm regions are defined. A color, or flux ratio among the MIR bands, has been measured at each pixel (3.7" in size). We find a wide variety of S7/S11 with a difference between arm and interarm regions. We also find that at some positions S11 seems to be higher than predicted by MW dust models. Estimated contributions from the stellar continuum and gas emission lines to the band are not enough to explain this discrepancy. From these results, we deduce that the PAH ionization condition and its fraction to the total dust mass in M51 are different from those in MW.
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UPDATES OF IRC IMAGING TOOLKIT AND DATA ARCHIVE
Fumi Egusa 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have been working on data processing and calibration ofAKARI/IRC images from pointed observations. As of September 2014, a data package for each pointing only contains raw data andquick-look data, so that users have to process them using the toolkit by themselves. We plan to change this situation and to provide science-ready data sets,which are easy-to-use for non-AKARI experts. For Phase 1\&2, we have updated dark and flat calibrations,and also the toolkit itself to produce images more reliable and easier to use. A new data package includes fully calibrated images with WCS information. We released it for about 4000 pointings at the end of March 2015.
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Jeeranan Manokawinchoke,Thanaphum Osathanon,Hiroshi Egusa,Prasit Pavasant 한국조직공학과 재생의학회 2016 조직공학과 재생의학 Vol.13 No.5
Hypoxic condition influences biological responses in various cell types. However, a hypoxic regulating osteogenic differentiation remains controversy. Here, an influence of short-term culture in hypoxic condition on osteogenic marker gene expression by retinoic acid-treated murine gingival fibroblast-derived induced pluripotent stem cells (RA-miPS) was investigated. Results demonstrated that hypoxic condition significantly upregulated Vegf, Runx2, Osx, and Ocn mRNA expression by RA-miPS in normal culture medium at day 3. Further, desferrioxamine significantly downregulated pluripotent marker (Nanog and Oct4) and enhanced osteogenic marker (Runx2, Osx, Dlx5, and Ocn) gene expression as well as promoted in vitro mineral deposition. However, the effect of cobalt chloride on osteogenic differentiation of RA-miPS was not robust. In summary, the results imply that hypoxic condition may be useful in the enhancement of osteogenic differentiation in RA-miPS.
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