The University of Tokyo
The University of Tokyo
The University of Tokyo
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University
出版者
宇宙航空研究開発機構(JAXA)
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料
雑誌名(英)
JAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
巻
JAXA-SP-17-009E
ページ
321 - 324
発行年
2018-03-09
会議概要（会議名, 開催地, 会期, 主催者等）
第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
会議概要（会議名, 開催地, 会期, 主催者等）（英）
The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
抄録（英）
We serendipitously discovered two young stellar object (YSO) candidates using the slit-less spectroscopic mode of the InfraRed Camera (IRC) on board AKARI. They are not associated with any known star-forming regions in the Galactic plane. Absorption bands of molecular species, including solid phase H2O, CO2, CO, and possibly gas phase CO, are seen in the spectra of both sources. In one of the sources, absorption bands of crystalline H2O, XCN, organics, and silicates are also seen. These results suggest that the objects are highly embedded class I YSOs or class II YSOs with an edge-on disk. However, their bluer color than typical YSOs and non-detection at far-infrared are not reconciled with expected spectral energy distributions of YSOs. Confirmation of these objects as YSOs will have a significant impact on the YSO study because it will suggest that a number of YSOs may have eluded detection in past infrared photometric surveys and could renew the census of YSOs on a galactic scale and their evolutionary tracks. The constraint of the properties of warm CO gas from high resolution spectroscopy in the M-band is crucial to reveal the true nature of the objects.
内容記述
形態: カラー図版あり
内容記述（英）
Physical characteristics: Original contains color illustrations
Analysis of Ice Absorption Features toward YSO Candidates using AKARI
AA1730026062.pdf
(926.87KB)
