12月22日(火)13:30~15:00 太陽系小天体セミナー zoom
Dec 22 Tue Solar System Minor Body Seminar
12月23日(水)15:00~16:00 ALMA-J seminar zoom
Dec 23 Wed
詳細は以下をご覧下さい。
12月22日(火)
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 12月22日(火曜日)13時30分~15時
- 場所
- zoom
- 講演者
- 西田信幸
- 連絡先
- 名前:渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
12月23日(水)
- Campus
- Mitaka
- Seminar
- ALMA-J seminar
- Regularly Scheduled/Sporadic
- Every Wednesday
- Date and time
- 2020 Dec 23 15:00-16:00
- Place
- Zoom
- Speaker
- Andres Guzman
- Affiliation
- NAOJ
- Title
- Disk Accretion in Ionizing High-Mass Stars
- Abstract
- We present 52 au spatial resolution observations of the O-type high-mass young stellar object (HMYSO) G345.49+1.47 (d~2.4 kpc, Lbol~1.5E5 L☉) made using the Atacama Large Millimeter/ submillimeter Array in Band 6. We detect circumstellar emission from the H38β hydrogen recombination line showing a compact photoionized disk rotating perpendicularly to the previously detected fast radio jet. This detection presents direct observational evidence that disks can effectively survive the photoionization feedback from young high-mass stars, allowing accretion to proceed past the main-sequence contraction phase. We discuss and model some of the physical parameters of the G345.49+1.47 disk, and propose possible scenarios for the HMYSO past and future evolution, as well as its implications to high-mass star formation.
- Facilitator
- Daisuke Iono, Andres Guzman