120億年以上前,星形成の激しい円盤銀河の渦巻き形状
Takafumi Tsukui1,2, Satoru Iguchi3,2
1Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo, Japan. t.tsukui@grad.nao.ac.jp.
Science (New York, N.Y.)
|May 21, 2021
まとめ
ビッグバンから14億年以内に 膨らみや円盤を含む初期の渦巻き銀河構造が形成されました BRI 1335-0417という 恒星形成の激しい 遠い銀河の特徴を明らかにしています
科学分野:
- 宇宙の進化
- 銀河の形成 と 進化
- 初期の宇宙の天体物理学
背景:
- 渦巻き銀河は膨らみ,円盤,渦巻き腕のような複雑な構造を持っています.
- 宇宙の歴史におけるこれらの構造の形成の時間軸は ほとんど不明のままです
- 初期の銀河の形成を理解することは 宇宙の進化を理解するために不可欠です
研究 の 目的:
- 渦巻き銀河構造の形成時期を調査する
- BRI 1335-0417という 遠くの銀河の内部構造を分析する
- 初期の銀河が 成熟した構造的要素を示していたか 判断するためです
主な方法:
- 銀河BRI 1335-0417の観測データの分析 赤道偏移4.41
- 内部動力学と形態学を推論するために[C ii]ガスの運動学を研究する.
- 突起,円盤,渦巻き腕/潮の尾などの特徴を識別するために運動データを解釈します.
主要な成果:
- 銀河の中心近くの急激な速度上昇を明らかにした.
- 2~5キロパルセックに及ぶ双腕の螺旋形が観察された.
- これらの特徴は 中央の膨らみ,回転するガス円盤,渦巻きの腕や 潮の尾の存在を示唆しています
結論:
- BRI 1335-0417の観測された構造は ビッグバンから14億年以内に形成されたことを示しています
- これは,スパイラル銀河の重要な構成要素が,以前考えられていたよりずっと早く形成されたことを示しています.
- 初期の銀河の形成は,モデルが示唆していたよりも速く複雑で,宇宙の恒星形成のピーク前に発生しました.
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