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KAKEN_16K17666seika.pdf
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Title |
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銀河系中心領域での局所的な爆発的星形成現象
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Kana |
ギンガケイ チュウシン リョウイキ デノ キョクショテキナ バクハツテキ ホシ ケイセイ ゲンショウ
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Gingakei chūshin ryōiki deno kyokushotekina bakuhatsuteki hoshi keisei genshō
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Local burst-like star formation in galactic central region
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田中, 邦彦
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タナカ, クニヒコ
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Tanaka, Kunihiko
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慶應義塾大学・理工学部 (矢上)・助教
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Research team head
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科研費研究者番号 : 00534562
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2019
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科学研究費補助金研究成果報告書
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2018
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銀河系中心部で見られる局所的な激しい星形成活動の起源を探ることを目的とし(1) 衝突分子雲中での誘発的星形成 (2)中心核近傍領域への質量供給過程の観測的研究をALMA望遠鏡を用いて行った。高速度分子雲CO-0.4が分子雲衝突の現場であることを高い確度で明らかにし、衝突によって星形成可能な高密度構造が形成される現場を捉えることに成功した。これまで十分調べられていなかった中心核近傍の低密度ガスの分布と運動の解析を行い、比較的最近の大規模な質量供給イベントの痕跡を見出した。また階層的パラメータ推定を用いた多輝線励起計算による分子雲の物理・化学状態推定法を実用化した。
Origin of the local burst-like star formation activity in the Galactic central region was investigated via observational case studies of candidate sites of collision-triggered star-forming regions and the molecular gas feeding to the circumnuclear region. High-sensitivity and high-resolution observations with ALMA identified shock-compressed layer created by cloud-cloud collision in the cloud CO-0.4, which harbors dense-gas peaks that may qualify the density threshold for star-formation in the highly-turbulent environment in the Galactic center. Detailed analysis of distribution and kinematics of low-density gas component in the cirnumnuclear disk was conducted, which showed signatures of a large-scale mass-feeding event in recent past. A new method of multi-transition excitation analysis employing a hierarchical parameter inference framework was developed and used in the above studies.
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研究種目 : 若手研究(B)
研究期間 : 2016~2018
課題番号 : 16K17666
研究分野 : 天文学
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