星間介質における芳香分子ベンゾニトリル (c-C₆H₅CN) の検出

Brett A McGuire^1,2, Andrew M Burkhardt³, Sergei Kalenskii⁴

¹National Radio Astronomy Observatory, Charlottesville, VA 22903, USA.

Science (New York, N.Y.)

|January 13, 2018

まとめ

天文学者たちは星間媒質のベンゾニトリルという単純な芳香分子を発見しましたこの発見は,素朴な窒素含有アロマティックと,未確認の赤外線帯のキャリアを結びつける可能性がある.

科学分野:

天体化学
星間媒体の構成
アロマティック分子の識別

背景:

ポリサイクル芳香炭化水素 (PAH) とその窒素を含む類型 (窒素ヘテロサイクル) は,宇宙に豊富にあると仮定されている.
これらの分子は,様々な天文学的源で観測された未確認赤外線 (UIR) 放射帯の媒介者であると疑われる.
恒星間介質の特定の芳香質を直接特定することは困難でした

研究の目的:

恒星間媒体の特定の窒素含有アロマティック分子を特定する.
より大きなPAHの前駆体としての単純な芳香分子の可能性を調査する.
観測された恒星間分子とUIRバンドキャリアの間の化学的リンクを確立する.

主な方法:

放射中のベンゾニトリル (c-C6H5CN) の超細分解の移行の観察
TMC-1分子雲のスペクトル線を検出するために,ラジオ天文学の技術を使用しています.

主要な成果:

恒星間媒質におけるベンゾニトリル (c-C6H5CN) の最初の決定的な天文学的検出
特定の放射線を標的とした分子雲TMC-1で観測を行った.
ベンゾニトリルは,特異的な高精度解像度のスペクトルトランジションによって識別されました.

結論:

ベンゾニトリルという単純な窒素含有アロマティック分子は星間空間で発見されました
この発見は基本的な芳香成分の存在を観察的証拠として提供しています
ベンゾニトリルは,より大きなポリサイクル芳香炭化水素の形成の前駆分子として機能し,UIR帯を潜在的に説明する.

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