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銀河と分子雲スケールで見た星間分子の組成
渡邉, 祥正
Permalink : http://hdl.handle.net/2115/77785
JaLCDOI : 10.14943/lowtemsci.78.211
KEYWORDS : 分子雲;星間分子;元素組成;Molecular cloud;Interstellar molecule;elemental abundance
Abstract
星間空間では200種類ほどの星間分子が発見されており，星形成領域では星間分子の組成に多様性 があることが知られている．その多様性の起源を明らかにするためには，星形成に至る前段階の分子 雲における化学組成を明らかにする必要がある．本稿では，銀河系内の分子雲と近傍銀河の分子雲の 化学組成を電波望遠鏡によるスペクトル線サーベイ観測の手法を用いて調べた．その結果，分子雲ス ケールでは化学組成に多様性がほとんどないことが明らかになった．この結果は星形成領域の化学組 成の多様性は，母体となる高密度なコアが形成されてから獲得されたことを示唆する．
More than 200 interstellar molecules have been identified in the universe. Strong diversity has been recognized in the chemical composition of interstellar molecules in star-forming regions. In order to reveal the origin of the chemical diversity,thereisaneedtoexplorethechemicalcharacteristicsatthescaleofthemolecularcloud,which defines the initial conditions for chemical evolution and star formation. With this in mind, we conducted spectral line survey observations of molecular clouds, both in the Milky Way and in other nearby galaxies. We found that the chemical composition was almost uniform at a molecular cloud scale, which implies that the chemical diversity seen in star-forming regions is acquired after the formation of dense parent cores.
More than 200 interstellar molecules have been identified in the universe. Strong diversity has been recognized in the chemical composition of interstellar molecules in star-forming regions. In order to reveal the origin of the chemical diversity,thereisaneedtoexplorethechemicalcharacteristicsatthescaleofthemolecularcloud,which defines the initial conditions for chemical evolution and star formation. With this in mind, we conducted spectral line survey observations of molecular clouds, both in the Milky Way and in other nearby galaxies. We found that the chemical composition was almost uniform at a molecular cloud scale, which implies that the chemical diversity seen in star-forming regions is acquired after the formation of dense parent cores.
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