October 29 Tue 10:00-11:30
太陽系小天体セミナー (Solar System Minor Body Seminar)
Zoom
October 30 Wed 10:30-12:00
SOKENDAI Colloquium
hybrid; Large Seminar Room in Subaru Building and Zoom
October 30 Wed 15:30-16:30
NAOJ Science Colloquium
hybrid; Large Seminar Room in Subaru Building and Zoom
詳細は下記からご覧ください。
=============== October 29 Tue===============
キャンパス：三鷹
セミナー名：太陽系小天体セミナー (Solar System Minor Body Seminar)
定例・臨時の別：定例
日時： 10月 29日（火曜日）10時～11時30分
場所：zoom
講演者：長谷川均
タイトル: 彗星研究の進捗報告（仮題)
世話人の連絡先
-名前：渡部潤一
備考：zoomでの参加
===============October 30 Wed==============
Campus：Mitaka
Seminar：SOKENDAI Colloquium
Regularly Scheduled/Sporadic：Scheduled
Date and time：October 30, 2024 10:30-12:00
Place：Large Seminar Room in Subaru Building and Zoom
Speaker：Abdurrahman Naufal
Affiliation：SOKENDAI 5th year (D3) (Supervisor: Yusei Koyama, Masayuki Tanaka, Yuichi Matsuda)
Title：The morphology of galaxies in the Spiderweb protocluster: disky quiescent galaxies?
Speaker：Ryota Ikeda
Affiliation：SOKENDAI 4th year (D2) (Supervisor: Daisuke Iono, Masayuki Tanaka, Takuma Izumi)
Title：Resolving Submillimeter Galaxies Pt.2 Future & Past
Facilitator
-Name：Yoshihiro Naito
Comment：Language: English
===============October 30 Wed==============
Campus: Mitaka
Seminar: NAOJ Science Colloquium
Date and time: 2024 October 30 (Wed.), 15:30-16:30 JST
Place: the large seminar room / Zoom (hybrid)
Speaker: Kaho Morii
Affiliation: The University of Tokyo (D3)
Title: Gas Infall and Core Growth in High-mass Star Formation
Abstract:
Understanding gas dynamics is a key to understanding star formation. Recent
observations of infrared dark clouds (IRDCs), the birthplace of high-mass stars,
imply the necessity of core growth by feeding gas from the surroundings.
To explore this, we conducted ALMA observations of a 70 μm dark region
within a massive, dense IRDC (~1180 Msun, 12 K). Our analysis of 19 cores,
including two intermediate-mass cores (10 and 4 Msun), shows signs of gas infall,
with velocities between 0.3-1.4 km/s and infall rates of 10^-4 to 10^-3 Msun/yr.
These are higher than in low-mass regions and can be considered a strong
indication of core growth, enabling the formation of high-mass stars from
intermediate-mass cores that would not originally be able to form high-mass stars
at their current mass.
Speaker: Bhardwaj Shubham
Affiliation: SOKENDAI/NAOJ (D2)
Title: GRB Closure Relationship in Multi-wavelength
Abstract:
Gamma-ray bursts (GRBs) are intense pulses of high-energy emission associated
with massive stars’ death or compact objects’ coalescence. Their multi-wavelength
observations help verify the reliability of the standard fireball model. We analyze
14 GRBs observed contemporaneously in gamma-rays by the Fermi Large Area
Telescope (LAT), in X-rays by the Swift Telescope, and in the optical bands by
Swift and many ground-based telescopes. We study the correlation between the
spectral and temporal indices using closure relations according to the synchrotron
forward-shock model in the stratified medium (n ∝r^{-k}) with k ranging from 0 to 2.5.
We find that the model without energy injection is preferred over the one with energy
injection in all the investigated wavelengths.
Facilitator:
-Name: Hiroki Nagakura
Language: English