November 28 Tue 10:00-11:30 太陽系小天体セミナー zoom
November 29 Wed 10:00-12:00 SOKENDAI Colloquium Large Seminar Room in Subaru Building and Zoom (hybrid)
November 29 Wed 15:30-16:30 NAOJ Science Colloquium Large Seminar Room in Subaru Building and Zoom (hybrid)
詳細は下記からご覧ください。
=============== November 28 Tue ===============
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：11月28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
=============== November 29 Wed===============
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：November 29, 2023 10:00-12:00
Place：Large Seminar Room in Subaru Building and Zoom
Speaker: Seiya Imai
Affiliation: SOKENDAI 1st year (M1) (Supervisor: Masayuki Tanaka, Yusei Koyama, Kiyoto Yabe)
Title: Search for extreme emission line galaxies at 1<z<3 using Subaru/Hsc
Speaker: Rikuto Omae
Affiliation: SOKENDAI 55h year (D3) (Supervisor: Mami Machida, Masami Ouchi, Kazuhiro Hada)
Title: Probing the Magnetic Fields of Distant Galaxies to Unravel the Evolution of Galactic Magnetic Fields
Speaker: Yuta Tashima
Affiliation: SOKENDAI 5th year (D3) (Supervisor: Mami Machida, Fumitaka Nakamura, Tomoya Takiwaki)
Title: Elucidation of Galactic Magnetic Field Structure by Pseudo-Observation Focusing on Depolarization
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
=============== November 29 Wed==============
Campus: Mitaka
Seminar: NAOJ Science Colloquium
Date and time: 2023 Nov. 29 (Wed.), 15:30-16:30
Place: the large seminar room / Zoom (hybrid)
Speaker: Yoko Oya
Affiliation: Kyoto University
Title: Physical Structures Traced by Chemical Diagnostics in Disk-Forming Regions of Young Low-Mass Protostellar Sources
Abstract:
To understand the origin of the Solar system, the physical/chemical evolution along the star/planet formation is a key issue. With the advent of ALMA, extensive observational studies have revealed that both the physical structure and the chemical composition drastically change during the disk formation around protostars. Furthermore, it has been found that molecular distributions are sensitive to changes in the physical conditions. Some kinds of molecular lines are therefore prospected to work as ‘molecular markers’ to selectively highlight particular structures of disk forming regions.
Specifically, sulfur-bearing species have empirically been good tracers; the kinematic structures of the circummultiple structure, the circumstellar disk, and the outflow lobes are traced by the OCS, H2CS, and SO emission, respectively, in a young low-mass protostellar source IRAS 16293-2422 Source A. The gas in its circummultiple structure was found to keep falling toward its periastron even beyond its centrifugal radius, which is often assumed to be the outer edge of a Keplerian disk.
Angular momentum of the gas is the essential topic to understand the structure formation. The chemical diagnostics with the aid of the molecular markers can be a helpful tool to tackle with the redistribution of the angular momentum among the disk/envelope and outflow structures. Conversely, detailed physical characterization is essential to elucidating the chemical evolution occurring there.
Facilitator
-Name: Masamitsu Mori
Comment: English