FEB 8 Tue 10:00～11:30 太陽系小天体セミナー / Solar System Minor Body Seminar zoom
FEB 9 Wed 14:30～15:30 ALMA-J seminar zoom
FEB 9 Wed 15:30～17:00 NAOJ Science Colloquium zoom
詳細は以下をご覧下さい
2月8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：2月8日（火曜日）10時00分～11時30分
場所：zoom
講演者：土屋智恵
世話人の連絡先
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
2月9日（水）
Campus: Mitaka
Seminar: ALMA-J seminar
Regularly Scheduled/Sporadic: Every Wednesday Date and Time: 2022 February 9 14:30-15:30
Place: Zoom
Speaker: Shanghuo Li (KASI)
Title: The sharp ALMA view of early stages of massive star formation
Abstract: The feedback of massive stars and clusters, such as radiation, wind, and supernovae, accounts for most of the energy budget in galaxies. However, our understanding of massive stars and cluster formation, especially the early evolutionary stages is still poor. The early evolutionary phases are crucial for understanding the initial conditions of massive star and cluster formation. Massive and dense infrared dark molecular clouds (IRDCs) that show no signs of ongoing star formation activities are considered to be the cradle of the massive stars and clusters. In order to investigate the formation of massive stars and their associated cluster, we carried out a systematic program with the ALMA and other interferometers toward IRDCs. Our studies yield promising clues to the formation of massive stars and protoclusters. For instance, we find that the nonthermal motions are predominantly subsonic and transonic, and gas filament widths are narrower than the previously proposed ‘quasi-universal’ 0.1 pc filament width. In this talk, I will present a detailed of our recent results in IRDCs using ALMA observations on a few 0.01 pc scales, including turbulence, filament, prestellar/protostelar core, molecular outflows, accretion, fragmentation, etc.
Facilitator: Patricio A. Sanhueza Nunez, Satoko Sorahana
2月2日（水）
ampus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2021 Feb. 9 15:30-17:00
Place：zoom
Speaker：Akiko Nakamura
Affiliation：Kobe University
Title：Formation of clusters in granular streams – Toward collisional experiments of dust agglomerates
Abstract：Cluster formation in free-falling granular streams has been studied experimentally and numerically, mainly for spherical particles. We experimentally investigate the growth process and the physical properties of the clusters, especially the packing fraction, in the hope that these clusters can be used to study the collisional process of dust agglomerates in the early solar system and planetary rings. In a comparison of granular streams of spherical and irregular particles, we showed that the stream of irregular particles evolved faster and formed clusters of larger sizes with lower packing fraction.
Facilitator
-Name：Akimasa Kataoka
Comment：English