Oct 25 Tue 10:00～11:30 太陽系小天体セミナー Zoom
Oct 26 Wed 10:30～12:00 SOKENDAI Colloquium Zoom
Oct 26 Wed 15:30～17:00 NAOJ Science Colloquium Zoom / Instrument Development Bldg. 3 (hybrid)
Oct 27 Thu 16:00～17:00 NAOJ Seminar Zoom/Large Seminar Room (hybrid)
Oct 28 Fri 13:30～15:00 Solar and Space Plasma Seminar Zoom / 310 (hybrid)
詳細は以下をご覧下さい
10月25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：10月25日（火曜日）10時00分～11時30分
場所：zoom
講演者：大澤亮
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
10月26日（水）
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Regular
Date and time：October 26th, 2022 10:30-12:00
Place：Zoom
Speaker 1: Raiga Kashiwagi
Affiliation: SOKENDAI 4th year (D2) (Supervisor: Kazunari Iwasaki, Tomoya Takiwaki, Nanase Harada)
Title: Simulation of collisions between filamentary molecular clouds threaded by lateral magnetic field and their evolution
Speaker 2: Moka Nishigaki
Affiliation: SOKENDAI 2nd year (M2) (Supervisor: Masami Ouchi, Tadafumi Takata, Kimihiko Nakajima)
Title: Review : TBA
Facilitator
-Name：Matsuda, Graduate Student Affairs Unit
10月26日（水）
Campus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2022 Oct. 26, 15:30-17:00
Place：zoom / Instrument Development Bldg. 3 (hybrid)
Speaker：Jeong-Gyu Kim
Affiliation：NAOJ
Title：Star formation efficiency and destruction of giant molecular clouds with stellar feedback
Abstract：Galaxy evolution crucially depends on how gas is converted into stars in giant molecular clouds (GMCs) and on how ensuing stellar feedback from young massive stars (in the form of UV radiation, stellar winds, and supernovae) interacts with the surrounding interstellar medium. Observations indicate that GMCs in normal disk galaxies turn only a small fraction of gas mass into stars per free-fall time and over their lifetimes, while clouds in denser environments may form stars more efficiently. Although stellar feedback is believed to play an important role in controlling the efficiency of star formation and cloud lifecycle, details remain elusive. In this talk, I will present results from radiation (M)HD simulations of star-forming GMCs with stellar feedback. I will show how the star formation efficiency and destruction timescale depend on various integrated cloud properties such as surface density, turbulence level, and magnetization, and discuss the relative importance of different feedback mechanisms. We explain the observed star formation rate of the Milky Way by applying our finding that the efficiency per free-fall time decreases with the virial parameter of a molecular cloud. Time permitting, I will also briefly introduce our ongoing effort in modeling multiphase galactic disks with self-consistent star formation and feedback using the TIGRESS numerical framework.
Facilitator
-Name：Akimasa Kataoka
Comment：English,
10月27日（木）
Campus: Mitaka
Seminar: NAOJ seminar
Regularly Scheduled/Sporadic: Every Friday
Date and Time: 2022 October 27 16:00-17:00
Place: Zoom / Large Seminar Room
Speaker:Surhud More (Inter-University Centre for Astronomy and Astrophysics)
Title:Status of Planet Nine Search using the Subaru
Abstract:
Planet Nine has been primarily proposed to explain the observed structure
of the Kuiper belt objects with semi-major axes beyond 200 AU. In this talk, I
will report on our multi-year observational program to search for Planet Nine
with the Hyper Suprime-Cam instrument on the 8 meter Subaru telescope.
Our survey area covers the sky region near the apocenters of the proposed
path of Planet Nine. I will describe the challenges involved with the data
reduction using the bleeding edge of the Rubin LSST pipeline, its
management over computing clusters separated over multiple continents
and having to deal with a large number of false positive detections in
difference images. I will summarize the current best constraints on the
existence of Planet Nine.
Facilitator: 守屋 尭 / Moriya, Takashi
10月28日（金）
Campus： Mitaka
Seminar： Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic： Scheduled
Date and time：28th Oct (Fri), 13:30-15:00
Place： 310 and Zoom (hybrid)
Speaker： Javier Piqueras Carreño
Affiliation：Universidad Politécnica de Madrid
Title：Introduction to spacecraft thermal control
The objective of the thermal control subsystem is to ensure a suitable thermal behavior of all the components of the spacecraft. The main driver of a spacecraft thermal design is the in-flight environment where it needs to operate. The purpose of the seminar is to have an overview of the thermal loads in an Earth’s orbit, the heat transfer mechanisms and the numerical methods used by thermal engineers to calculate the temperatures of the spacecraft.
Facilitator
-Name：Takayoshi oba
Comment：in English