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2010.11.1-11.7

11月1日(月)

  • 13:30~15:00 太陽系小天体セミナー 南棟2階会議室

11月2日(火)

  • 15:30~17:30 EA-ARCセミナー ALMA棟3階 307

11月1日(月)

キャンパス
三鷹
セミナー名
太陽系小天体セミナー
臨時・定例の別
定例
日時
11月1日(月)13:30~15:00
場所
南棟2階会議室
内容
論文紹介ほか各種話題の持ち込み
世話人の連絡先
 名前:渡部潤一
備考
テレビ参加可、主に英語で進行

11月2日(火)

キャンパス
三鷹
セミナー名
EA-ARCセミナー
臨時・定例の別
定例
日時
 11月2日(火曜日) 15:30~17:30
場所
ALMA棟3階 307
講演者
江草芙実 さん
所属
宇宙研
タイトル
CARMA CO observations at GMC scale — Molecular gas evolution across a spiral arm in M 51
Abstract:(optional)
We present sensitive and high angular resolution CO(1-0) data obtained by the Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations toward the nearby grand-design spiral galaxy M 51. The angular resolution of 0.7′′ corresponds to 30 pc, which is similar to the typical size of Giant Molecular Clouds (GMCs), and the sensitivity is also high enough to detect typical GMCs. Within the 1′ field of view centered on a spiral arm, a number of GMC-scale structures are detected as clumps. However, only a few clumps are found to be associated with each Giant Molecular Association (GMA), and more than 90% of the total flux is resolved out in our data.
Considering the high sensitivity and resolution of our data, these results indicate that GMAs are not mere confusion of GMCs but plausibly smooth structures. In addition, we have found that the most massive clumps are located downstream of the spiral arm, which suggests that they are at a later stage of molecular cloud evolution across the arm and plausibly are cores of GMAs. By comparing with Hα and Paα images, most of these cores are found to have nearby star forming regions. We thus propose an evolutionary scenario for the interstellar medium, in which smaller molecular clouds collide to form smooth GMAs at spiral arm regions and then star formation is triggered in the GMA cores. Our new CO data have revealed the internal structure of GMAs at GMC scales, finding the most massive substructures on the downstream side of the arm in close association with the brightest H II regions.
世話人の連絡先
名前: 安井 千香子

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