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AKARI NIR spectroscopy of interstellar ices

Published online by Cambridge University Press:  27 October 2016

Takashi Onaka ,
Tamami I. Mori ,
Itsuki Sakon ,
Fumihiko Usui ,
Ronin Wu  and
Takashi Shimonishi
Takashi Onaka
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: onaka@astron.s.u-tokyo.ac.jp
Tamami I. Mori
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: onaka@astron.s.u-tokyo.ac.jp
Itsuki Sakon
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: onaka@astron.s.u-tokyo.ac.jp
Fumihiko Usui
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: onaka@astron.s.u-tokyo.ac.jp
Ronin Wu
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: onaka@astron.s.u-tokyo.ac.jp
Takashi Shimonishi
Affiliation:
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University6-3 Aramakiazaaoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan
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Abstract

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The Infrared Camera (IRC) onboard AKARI has a near-infrared (2--5μm) spectroscopic capability with high sensitivity that allows us to study the major ice components in various objects. In particular, H2O and CO2 ice absorption features have been detected towards nearby galaxies, including several young stellar objects (YSOs) in the Large Magellanic Cloud (LMC), as well as a number of HII region-PDR complexes for the first time by IRC spectroscopy. While observations in the LMC show a high ratio (~0.34) of the CO2 to H2O ice column densities, the ratios in Galactic HII-region-PDR complexes are in the range of 0.1--0.2, being compatible with those found in Galactic massive YSOs in previous studies. The good correlation supports concurrent formation of the two ice species on the grain surface and the higher ratio in the low-metallicity LMC suggests possible environmental effects in the formation process.

Keywords

(ISM:) dustextinctionISM: lines and bandsinfrared: ISMastrochemistry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , pp. 319 - 320
Copyright
Copyright © International Astronomical Union 2016 

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