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2019.07.22-07.28

7月23日(火)13:30~15:00   太陽系科学セミナー      講義室
Jul 23 Tue         Solar System Science Seminar  Lecture Room

7月24日(水)10:30~12:00   総研大コロキウム       講義室
Jul 24 Wed         SOKENDAI colloquium       Lecture Room

7月24日(水)13:30 ~15:00   科学研究部コロキウム       開発棟3号館3階会議室  
Jul 24 Wed        Colloquium of Division of Science  Conference room, Instrument Development Bldg. 3 3F

詳細は以下をご覧下さい。

7月23日(火)

キャンパス
三鷹
セミナー名
太陽系科学セミナー
定例・臨時の別
定例
日時
7月23日(火曜日)13時30分~15時30分
場所
講義室
講演者
寺井剛
タイトル
可視光・近赤外線観測で探る外縁天体の起源と進化
Abstract
海王星軌道以遠の領域に位置する外縁天体(TNOs)は、過去に経験し
た力学進化の痕跡を色濃く残している小天体集団で、微惑星集積や惑星大移動な
ど太陽系の歴史を解明するうえで不可欠な手掛かりを数多く保持している。
また、ケンタウルス天体や短周期彗星の供給源であるという観点からも、それら
の起源や進化を理解することは重要である。
本講演では、可視光および近赤外線による外縁天体の観測研究について紹介する。
今回は主に(1)可視光カラー分布、(2)天体表面の水氷結晶度の2点をテーマに
し、これまでに実施された観測研究やその結果から展開された理論研究を紹介す
るとともに、我々の研究成果を踏まえつつ今後の研究方針や展望について議論する。

連絡先
-名前:樋口有理可
備考
テレビ会議による参加も可

7月24日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
July 24, 2019, 10:30 -12:00

Place
Lecture Room

Speaker
Suzuka Nakano
Affiliation
SOKENDAI 1st year (M1) (Supervisor: Masatoshi Imanishi, Kouichiro Nakanishi, Takuma Izumi)
Title
Mm/submm Energy Diagnostics of the AGN-Starburst Composite Galaxy NGC 7469 with ALMA

Speaker
Umi Kobayashi
Affiliation
SOKENDAI 1st year (M1) (Supervisor: Masayuki Tanaka, Masatoshi Imanishi, Kouichiro Nakanishi)
Title
Influence of galaxy mergers on AGN activities in the local Universe Abstract(if you like): Galaxy-galaxy mergers are thought to be one of the key processes for galaxy growth. Mergers may also transfer gas to the center and feed the super massive black holes(SMBHs), making natural co-evolution of the SMBHs and host galaxies. There is rich literature on the subject, but many of the papers are based on data from shallow imaging surveys such as SDSS or from small field coverages. The HSC survey delivers much deeper data over a wider area, allowing much better identifications of merger features. This provides us with an unique opportunity to revisit the subject. We focus on galaxies in the local Universe (z<~0.2) with spectra from SDSS and adopt visual/automated classifications of galaxies to evaluate an influence of mergers on triggering AGN activities. We also plan to characterize the environment of mergers and AGNs. A preliminary analysis suggests that mergers indeed enhance AGN activities and mergers and AGNs are not necessarily in high density environments.

Facilitator
-Name:Kei Ito
Comment
TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.

7月24日(水)

Campus
Mitaka
Seminar
NAOJ Science Colloquium
Regularly Scheduled/Sporadic
Regularly Scheduled
Date and time
July, 24 2019 (Wednesday) 13:30-15:00
Place
Conference room, Instrument Development Bldg. 3, 3F
Speaker
Yuta Yamazaki
Affiliation
Univ. of Tokyo
Title
Evolution of r-process elements: whole isotopic abundance pattern from multi astrophysical sites
Abstract
R-process is a neutron capture process which produce a half of heavy elements in the universe. However, its detailed process is still not clear since r-process proceed by capturing neutrons very rapidly. Its astrophysical site(s) is also under debate although some candidates, such as type II supernova or neutron star merger, have been considered as possible sites for many years. To resolve this open question, many calculations of galactic chemical evolution have been performed. In those previous studies, time evolution of Europium, a representative r-process element, have been discussed by considering different time-varying contribution from supernova and neutron star merger. Both of the observations and theoretical calculations, however, have such a large uncertainty that the debate has not been settled yet. In this study, we focused on the deference in abundance pattern found in deferent astrophysical sites. R-process nucleosynthesis is affected by neutron richness, in particular, yields of elements heavier than lanthanoids are strongly dependent on its environment. We calculated the abundance pattern over the whole range of r-process elements as a function of time by using a one-zone galactic chemical evolution model. Contribution from all possible astrophysical sites are taken into account. Results are evaluated by the observed abundance of metal-poor stars in the Milky Way. In this talk, suggestions about r-process nucleosynthesis from our theoretical calculation will be discussed on the basis of observational data. I will also talk about some future prospects of r-process studies with next-generation telescopes.

Facilitator
-Name:Akimasa Kataoka
Comment
(optional) Language, attending by Video conference system acceptable or not, and related information (IP address etc.)

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