AKARI NIR spectroscopy of interstellar ices

Takashi Onaka; Tamami I. Mori; Itsuki Sakon; Fumihiko Usui; Ronin Wu; Takashi Shimonishi

doi:10.1017/S1743921316003161

AKARI NIR spectroscopy of interstellar ices

Takashi Onaka, Tamami I. Mori, Itsuki Sakon, Fumihiko Usui, Ronin Wu, Takashi Shimonishi

Creative Interdisciplinary Research Division

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Abstract

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.

Original language	English
Pages (from-to)	319-320
Number of pages	2
Journal	Proceedings of the International Astronomical Union
Volume	11
Issue number	A29A
DOIs	https://doi.org/10.1017/S1743921316003161
Publication status	Published - 2015 Jan 1

Keywords

(ISM:) dust
ISM: lines and bands
astrochemistry
extinction
infrared: ISM

ASJC Scopus subject areas

Medicine (miscellaneous)
Astronomy and Astrophysics
Nutrition and Dietetics
Public Health, Environmental and Occupational Health
Space and Planetary Science

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Onaka, T., Mori, T. I., Sakon, I., Usui, F., Wu, R., & Shimonishi, T. (2015). AKARI NIR spectroscopy of interstellar ices. Proceedings of the International Astronomical Union, 11(A29A), 319-320. https://doi.org/10.1017/S1743921316003161

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title = "AKARI NIR spectroscopy of interstellar ices",

abstract = "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.",

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author = "Takashi Onaka and Mori, {Tamami I.} and Itsuki Sakon and Fumihiko Usui and Ronin Wu and Takashi Shimonishi",

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AU - Onaka, Takashi

AU - Mori, Tamami I.

AU - Sakon, Itsuki

AU - Usui, Fumihiko

AU - Wu, Ronin

AU - Shimonishi, Takashi

PY - 2015/1/1

Y1 - 2015/1/1

N2 - 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.

AB - 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.

KW - (ISM:) dust

KW - ISM: lines and bands

KW - astrochemistry

KW - extinction

KW - infrared: ISM

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