| Project/Area Number |
23740146
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SAKAI Takeshi 東京大学, 大学院・理学系研究科, 特任助教 (20469604)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 電波天文 / 分子雲 / 星形成 / 大質量星 / 重水素 / 星間分子 / ミリ波 / 天文学 / 受信機 / 重水素濃縮 |
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| Research Abstract |
We have investigated the timescale of high-mass starless core phase from the deuterium fractionation rations in massive clumps. We have observed the HNC and HN13C lines toward the massive clumps, including infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), with the Nobeyama Radio Observatory 45 m telescope. We have found that the DNC/HNC ratio of the massive clumps is lower than that of the low-mass cores. This suggests that the timescale of high-mass starless phase is shorter than that of low-mass starless phase. By comparing with the model calculations, we have found that the timescale of high-mass starless phase is shorter than several times 104 yr.
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