MAR 8 Tue 10:00～11:30 太陽系小天体セミナー / Solar System Minor Body Seminar zoom
MAR 9 Wed 14:30～15:30 ALMA-J seminar zoom
MAR 9 Wed 15:30～17:00 NAOJ Science Colloquium zoom
詳細は以下をご覧下さい
3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：3月8日（火曜日）10時00分～11時30分
場所：zoom
講演者：高橋葵
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
3月9日（水）
Campus: Mitaka
Seminar: ALMA-J seminar
Regularly Scheduled/Sporadic: Every Wednesday
Date and Time: 2022 March 9 14:30-15:30
Place: Zoom
Speaker: Yu Cheng (NAOJ)
Title: Disks and Outflows in the Intermediate-mass Star Forming Region NGC 2071 IR
Abstract: Intermediate mass protostars, i.e., YSOs that will eventually reach final masses of 2–8 Msun, constitute the link between low- and high-mass protostars, and hence provide a natural laboratory to test star formation theories that unify the two mass regimes. Here I will present our recent ALMA band 6/7 (1.3 mm/0.87 mm) and VLA Ka band (9 mm) observations toward NGC 2071 IR, an intermediate-mass star forming region. These observations allow us to study the detailed star formation process towards the dominant luminosity contributors of the region, IRS1 and IRS3, on ~100 au scales. Both sources show strong evidence of disk substructures in the continuum. IRS1 is an intermediate mass protostellar system (3Msun<m<5Msun) with the disk showing a bar-spiral configuration, while IRS3 is a low mass (1.5Msun<m<1.8Msun) close binary system that is in the very early stage of disk fragmentation. For both IRS1 and IRS3, the inferred ejection directions from different tracers, including radio jet, water maser, molecular outflow, and H2 emission, are not always consistent, and can be misaligned by ∼50 degrees. IRS3 is better explained by a single precessing jet. A similar mechanism may be present in IRS1 as well but unresolved multiplicity is also possible. IRS1 and IRS3 represent different classes of protostellar disks but both are special in many aspects and could provide important insights on multiple pressing questions connected to our understanding of disk formation and evolution.
Facilitator: Patricio A. Sanhueza Nunez, Satoko Sorahana
3月9日（水）
Campus：Mitaka
Seminar：NAOJ Science Colloquium
Regularly Scheduled/Sporadic：Every Wednesday
Date and time：2022 March 9, 15:30-17:00
Place：zoom
Speaker：Agnieszka Pollo
Affiliation：Jagiellonian University
Title：Evolution of galaxies in the large scale structure
Abstract：Galaxies are objects known to evolve with time. This evolution depends on their environments, and even broader – on their position in the
large-scale cosmic web. However, the old question – “nature or
nurture” – i.e. to what extent this difference in evolutionary paths
is driven by original properties of a galaxy and its host halo, and to
what extent by interactions with the environment – remains open until
this very day. In my talk, I plan to present a selection of results of
our team aimed at solving this riddle, based on data from z~0.1 (like
the GAMA survey), through z~1 (the VIPERS survey) up to z~3 (the VUDS
survey). I will also discuss some prospects for the future.
Facilitator
-Name：Akimasa Kataoka
Comment：English