AKARI near-infrared spectroscopy: Detection of H2O and CO 2 ICES toward young stellar objects in the Large Magellanic Cloud

Takashi Shimonishi; Takashi Onaka; Daisuke Kato; Itsuki Sakon; Yoshifusa Ita; Akiko Kawamura; Hidehiro Kaneda

doi:10.1086/592948

AKARI near-infrared spectroscopy: Detection of H₂O and CO ₂ ICES toward young stellar objects in the Large Magellanic Cloud

Takashi Shimonishi, Takashi Onaka, Daisuke Kato, Itsuki Sakon, Yoshifusa Ita, Akiko Kawamura, Hidehiro Kaneda

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H2O ice 3.05 μm and the CO₂ ice 4.27 μm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectroscopically confirmed to be YSOs. We used a curve-of-growth method to evaluate the column densities of the ices and derived the CO₂/H₂O ratio to be 0.45 ± 0.17. This is clearly higher than that seen in Galactic massive YSOs (0.17 ± 0.03). We suggest that the strong ultraviolet radiation field and/or the high dust temperature in the LMC may be responsible for the observed high CO₂ ice abundance.

Original language	English
Pages (from-to)	L99-L102
Journal	Astrophysical Journal
Volume	686
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/592948
Publication status	Published - 2008

Keywords

Abundances
Circumstellar matter
Dust
Extinction
ISM
Magellanic clouds
Molecules
Pre-main-sequence
Stars

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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AKARI near-infrared spectroscopy : Detection of H₂O and CO ₂ ICES toward young stellar objects in the Large Magellanic Cloud. / Shimonishi, Takashi; Onaka, Takashi; Kato, Daisuke; Sakon, Itsuki; Ita, Yoshifusa; Kawamura, Akiko; Kaneda, Hidehiro.

In: Astrophysical Journal, Vol. 686, No. 2 PART 2, 2008, p. L99-L102.

Research output: Contribution to journal › Article › peer-review

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abstract = "We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H2O ice 3.05 μm and the CO2 ice 4.27 μm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectroscopically confirmed to be YSOs. We used a curve-of-growth method to evaluate the column densities of the ices and derived the CO2/H2O ratio to be 0.45 ± 0.17. This is clearly higher than that seen in Galactic massive YSOs (0.17 ± 0.03). We suggest that the strong ultraviolet radiation field and/or the high dust temperature in the LMC may be responsible for the observed high CO2 ice abundance.",

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AU - Shimonishi, Takashi

AU - Onaka, Takashi

AU - Kato, Daisuke

AU - Sakon, Itsuki

AU - Ita, Yoshifusa

AU - Kawamura, Akiko

AU - Kaneda, Hidehiro

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