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http://dx.doi.org/10.5303/PKAS.2017.32.1.141

STUDY OF CO2/H2O ICE ABUNDANCE RATIOS IN NEARBY GALAXIES WITH THE AKARI NEAR-INFRARED SPECTROSCOPY  

Yamagishi, Mitsuyoshi (Graduate School of Science, Nagoya University)
Kaneda, Hidehiro (Graduate School of Science, Nagoya University)
Oyabu, Shinki (Graduate School of Science, Nagoya University)
Ishihara, Daisuke (Graduate School of Science, Nagoya University)
Onaka, Takashi (Graduate School of Science, The University of Tokyo)
Shimonishi, Takashi (Graduate School of Science, Kobe University)
Suzuki, Toyoaki (SRON Netherlands Institute for Space Research)
Publication Information
Publications of The Korean Astronomical Society / v.32, no.1, 2017 , pp. 141-145 More about this Journal
Abstract
We study $CO_2/H_2O$ ice abundance ratios in nearby galaxies using AKARI near-infrared slit spectroscopy. Past studies of the ices intensively examined $CO_2/H_2O$ ratios mainly in our Galaxy, and found that there were considerable variations in the $CO_2/H_2O$ ratios from object to object. The cause of the variations is, however, still under debate. As a result of the analysis of our sample that includes 1031 regions in 158 galaxies, the $CO_2/H_2O$ ratios are in a range of 0.05-0.30. In the dataset, we find that the $CO_2/H_2O$ ratios positively correlate with the $Br{\alpha}/PAH$ $3.3{\mu}m$ ratios which reflect the massive star formation activity. Furthermore, we find that the $CO_2/H_2O$ ratios positively correlate with the specific star formation rates of the galaxies where the ices are detected, that reflect the evolutionary stage of a galaxy. These results suggest that the $CO_2/H_2O$ ratios are enhanced in active star-forming regions and young galaxies.
Keywords
infrared; galaxies: ISM; molecules;
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