Nov 29 Tue 10:00～11:30 太陽系小天体セミナー Zoom
Nov 30 Wed 10:30～12:00 SOKENDAI Colloquium Zoom
Nov 30 Wed 14 :30～15:30 ALMA-J seminar Zoom
Nov 30 Wed 15:30～17:00 NAOJ Science Colloquium Zoom
Dec 1 Thu 10:40～11:40 NAOJ Seminar Zoom/Large Seminar Room
Dec 2 Fri 17:00～18:30 Solar and Space Plasma Seminar Zoom
詳細は以下をご覧下さい
11月29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：11月29日（火曜日）10時00分～11時30分
場所：zoom
講演者：藤原康徳
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
11月30日（水）
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：November 30, 2022 10:30-12:00
Speaker : Kousuke Ishihara
Affiliation: SOKENDAI 3rd year (D1) (Supervisor: Masao Saito, Fumitaka Nakamura, Patricio Sanhueza)
Title: Study of fragmentation scale in star-forming regions
Speaker: Abdurrahman Naufal
Affiliation: SOKENDAI 3rd year (D1) (Supervisor: Yusei Koyama, Masayuki Tanaka, Yuichi Matsuda)
Title: (tentative) Rest-frame optical morphology of galaxies at high redshift (article introduction of Ferreira et al. 2022)
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
11月30日（水）
Campus：Mitaka,
Seminar：ALMA-J seminar
Regularly Scheduled/Sporadic： Every Wednesday
Date and time：30th November (Wed), 14:30 – 15:30
Place：Zoom
Speaker: Dr. Paulo Cortes
Affiliation: National Radio Astronomy Observatory / Joint ALMA Observatory
Title: The magnetic field in NGC6334I(N), NGC6334I, and G351. First results from the MagMAR project.
Abstract:
In this talk, I will present a summary description of the MagMAR project (P. I. P. Sanhueza, NAOJ) with detailed results from polarized dust and line emission from NGC6334I(N), NGC6334I, and G351 obtained with ALMA.
In all three sources, the magnetic field presents a complex morphology which we are able to trace at different densities and velocities. I will also present a preliminary comparison between COMs emission from the hot cores and the magnetic field in these sources.
11月30日（水）
Campus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2022 Nov. 30, 15:30-17:00
Place：zoom
Speaker：Seamus Clarke
Affiliation：Academia Sinica Institute of Astronomy and Astrophysics
Title：Filaments and their role in the star formation process
Abstract：It has long been known that filaments have been connected to the star formation process but Herschel observations have sparked a recent interest in them. However, how they play this role is not fully understood, nor is the effect of their geometry on the star formation process. Here I will present two recent works, one numerical and one observational, looking at helping to understand the place filaments occupy in star formation. First, I will present a numerical study looking at the fragmentation of an accreting, non-equilibrium filament. I show that filaments are prone to fragment into smaller sub-filaments due to internal accretion-driven turbulence. These sub-filaments play a key role in the formation of cores, affecting both their number and mass. Moreover, unlike in equilibrium models of filament fragmentation, no characteristic fragmentation length-scale is observed. Second, I will present a Herschel study of the outer Galaxy giant molecular filament (GMF) G214.5-1.8. I find that G214.5 has a mass of ~16,000 solar masses, similar to clouds such as Serpens and Mon R2, yet is mostly quiescent while those are highly star forming. I find that G214.5 has fragmented into numerous clumps and that there appears to be no characteristic fragmentation length-scale present. I show that the GMF is unusual in its high aspect ratio, narrowness, and paucity of dense gas, as well as having a highly asymmetric radial profile consistent with compression. Using HI survey data, I find that G214.5 lies on the edge of a HI superbubble and this may be the cause of G214.5’s properties, highlighting external effects and how they shape filaments within the bubble-dominated interstellar medium.
Facilitator
-Name：Akimasa Kataoka
Comment：English,
12月1日（木）
Campus: Mitaka
Seminar: NAOJ seminar
Regularly Scheduled/Sporadic:Sporadic
Date and Time: 2022 December 1 10:40-11:40
Place: Zoom / Large Seminar Room
Speaker: Thomas Zurbuchen (NASA Associate Administrator for the Science Mission Directorate)
Titile:Explore Science James Webb Space Telescope: Initial Results
Facilitator: 中村 文隆 / Nakamura, Fumitaka
12月2日（金）
Campus： Mitaka
Seminar： Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic： Scheduled
Date and time：2 December (Fri), 17:00-18:30
Place： zoom
Speaker：Carlos J. Díaz Baso
Title : Application of machine learning and neural networks to data processing in solar physics
Abstract:
With current and future solar telescopes, the Sun is observed in unprecedented detail, making it possible to study its activity on a very small scales and to discover fascinating phenomena. As a result, large volumes of data are collected that cannot be reasonably analyzed with conventional methods. In the last decade, machine learning and neural networks have emerged as powerful tools to select and analyze relevant information from these huge collections. By exploiting symmetries and patterns in the data, these new techniques can be optimized to perform various autonomous tasks (such as classifications, regression problems, dimensionality reduction, and many others) faster and better than conventional methods. In this contribution, I will review a selection of successful applications to various problems in solar physics, including data preprocessing, automatic solar feature segmentation, image deconvolution, acceleration of spectropolarimetric inversions, and prediction of explosive phenomena. Finally, I will discuss outstanding issues and provide an outlook for future research.
Facilitator
-Name：Yusuke Kawabata
Comment：in English, zoom