Home > Solar and Space Plasma (SSP) Seminar | 国立天文台談話会 | 太陽系小天体セミナー | 総研大コロキウム | 赤外ゼミ > 2017.10.23-10.29

2017.10.23-10.29

10月24日(火)13:30~15:00 太陽系小天体セミナー       南棟2階会議室
Oct 24 Tue         Solar System Minor Body Seminar   Conference Room, South Bldg.2F

10月25日(水)10:30~12:00 総研大コロキウム         講義室
Oct 25 Wed         SOKENDAI colloquium        Lecture Room

10月25日(水)13:30~14:30 理論コロキウム          コスモス会館会議室    
Oct 25 Wed         DTA colloquium          Conference Room, Cosmos Lodge

10月27日(金)10:30~12:00 赤外ゼミ             ALMA棟102室     
Oct 27 Fri         Infrared Seminar          ROOM102 ALMA Bldg.

10月27日(金)13:30~15:00 太陽天体プラズマセミナー     院生セミナー室
Oct 27 Fri         Solar and Space Plasma SeminarStudent Seminar Room, Subaru Bldg. 

10月27日(金)15:00~16:00 国立天文台談話会         大セミナー室  
Oct 27 Fri         NAOJ Seminar            Large Seminar Room 

10月27日(金)16:00~17:00 国立天文台談話会         大セミナー室  
Oct 27 Fri         NAOJ Seminar            Large Seminar Room 

詳細は以下をご覧下さい。

10月24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24日(火曜日)13時30分~15時
場所
南棟2階会議室
講演者
匠あさみ

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25日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
October 25, 2017, 10:30 -12:00

Place
Lecture Room

Speaker1
Hisakazu Uchiyama
Affiliation
SOKENDAI: D3 (Supervisor : Nobunari Kashikawa, Yuichi Matsuda, Yutaka Komiyama)
Title
Systematic Study of QSO Radiative Feedback in High-z Universe

Speaker2
Masaki Yoshida
Affiliation
SOKENDAI: D1 (Supervisor :Y. Suematsu, H. Hara, R. Ishikawa)
Title
Wave Propagation along Spicules Observed by Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP)

Facilitator
-Name:Nagaaki Kambara

Comment
TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.

10月25日(水)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled/Sporadic
Regularly Scheduled
Date and time
Oct. 25 2017, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Sho Fujibayashi
Affiliation
Kyoto University
Title
The evolution and mass ejection from the remnant of the binary neutron star merger
Abstract
We perform general relativistic, long-term, axisymmetric neutrino radiation hydrodynamics simulations for a remnant massive neutron star (MNS) surrounded by a torus, which is a canonical remnant formed after the binary neutron star merger. In this work, we take into account effects of viscosity which is likely to arise in the merger remnant due to magnetohydrodynamical turbulence. We find that two viscous effects play a key role for the evolution of the remnant system and resulting mass ejection. In the first ~10 ms, the structure of the MNS is changed due to the viscous angular momentum transport. As a result, a sound wave, which subsequently becomes a shock wave, is formed in the vicinity of the MNS and the shock wave leads to significant mass ejection. For the longer-term evolution with ~ 0.1–10 s, viscous effects on the torus surrounding the MNS play an important role for mass ejection. The mass ejection rate depends on the viscous parameter for both mass ejection mechanisms, but even for the conservative alpha viscous parameter $\alpha_{\rm vis}\sim0.01$, total ejecta mass is $\sim 5\times 10^{-3}\ M_\odot$ and for $\alpha_{\rm vis}\sim0.04$, it could be $0.02\ M_\odot$. In this talk, I will explain the viscosity-driven mass ejection processes and discuss the electromagnetic signal from the ejecta.
Facilitator
-Name:Tomoya Takiwaki

Comment
in English

10月27日(金)

キャンパス
三鷹
セミナー名
赤外ゼミ
定例・臨時の別
定例
日時
10月27日(金曜日)10:30~12:00
場所
ALMA棟102室
講演者
林 左絵子 (国立天文台)
タイトル
すばる望遠鏡に見られるTerrestrial dustについて
連絡先
-名前:大宮正士・石川裕之

備考
後半11:30~12:00には新着論文の情報交換です。
   ZOOM、TV会議システムでの参加も可能です。

10月27日(金)

Campus
Mitaka
Seminar
Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic
Regular
Date and time
27 October (Fri), 13:30-15:00
Place
Student Seminar Room, Subaru Bldg.
Speaker
Motoshi Goto
Affiliation
National Institute for Fusion Science
Title
Polarization spectroscopy for a study of anisotropic electron velocity distribution function in fusion plasma
Abstract
Excited states of atoms or ions in fusion plasma are dominantly created by electron collisions. When electrons in a plasma have an anisotropic velocity distribution function, excited states can have an inhomogeneous population distribution over the magnetic sublevels. Emission lines accompanying radiative transitions from such inhomogeneous states are generally polarized.In the Large Helical Device (LHD) at National Institute for Fusion Science, we have incorporated the same optical components as those used for CLASP into an existing normal incidence spectrometer and have started a polarization measurement for the Lyman-α line at 121.56nm.Initial results show that the polarization degree, which is in the order of several percent, has a tendency to decay as the electron density is increased. This behavior qualitatively agrees with our prediction because collisional relaxation processes become more effective and the anisotropy in the electron velocity distribution function should be more relaxed in a higher density condition.A summary of the obtained measurement results and the concept of a theoretical model to be used for the data analysis are introduced at the seminar.

Facilitator
-Name:Shin Toriumi

10月27日(金)

キャンパス
三鷹
セミナー名
国立天文台談話会
定例・臨時の別
臨時
日時
10月27日(金) 15:00-16:00
場所
大セミナー室
講演者
Juergen Stutzki
所属
Universitat zu Koln
タイトル
CCAT-prime: a fast submm telescope for large area surveys
Abstract
CCAT-prime is a 6-meter diameter telescope located at 5600 meters elevation on Cerro Chajnantor in the high Atacama Desert of northern Chile, near the site of the TAO infrared telescope. Situated at a high, dry site and with a surface accuracy of better than 10 μm, CCAT-p will observe the sky at submillimeter to millimeter wavelengths. The novel ”crossed-Dragone” optical design delivers a high-throughput, wide-field-of-view telescope capable of illuminating more than 100,000 detectors, thus enabling rapid mapping of large areas of the sky. The high site offers superb observing conditions, yielding routine access to the 350 μm window. Deployment of the CCAT-p telescope and instrumentation on Cerro Chajnantor will provide operational experience at high altitude, reducing risk for the future construction of a 25-meter class telescope at the same site. A partnership between Cornell University, a consortium of German institutions led by Universitat zu Koln, and a consortium of eight Canadian academic institutions are working together to create CCAT-prime. Researchers at additional institutes in the U.S., Canada, Germany and Chile are involved in science planning and instrument development.

連絡先
-名前:松田 有一

10月27日(金)

キャンパス
三鷹
セミナー名
国立天文台談話会
定例・臨時の別
定例
日時
10月27日(金) 16:00-17:00
場所
大セミナー室
講演者
白崎正人
所属
理論研究部(NAOJフェロー)
タイトル
重力レンズ効果を用いた観測的宇宙論
Abstract
主に天文観測によって得られたデータを基に、我々の宇宙の起源・構造・進化を研究する学問は、観測的宇宙論と呼ばれます。近年の天文観測の目覚ましい発展により、観測的宇宙論は転換期を迎えつつあります。宇宙のエネルギー組成や膨張史が高い精度で決定される一方で、銀河や銀河団などの構造の礎になる暗黒物質、近傍宇宙の加速度的膨張といった既存の物理学の枠組みでは説明できない「謎」が残されています。次世代の天文観測では、これらの残された宇宙論の謎に取り組むことが一大テーマとして掲げられています。すばる望遠鏡の次世代観測器による銀河撮像分光観測「すみれ計画」も、暗黒物質や加速膨張という宇宙論の謎の解明をオールジャパン体制で目指します。本公演では、すみれ計画の主たる観測目標の一つである「遠方銀河の重力レンズ効果」について取り上げ、銀河の撮像観測からいかにして現代宇宙論の謎に迫ろうとしているのか、発表者のこれまでの研究成果を交えつつ、議論したいと思います。

連絡先
-名前:松田 有一

Home > Solar and Space Plasma (SSP) Seminar | 国立天文台談話会 | 太陽系小天体セミナー | 総研大コロキウム | 赤外ゼミ > 2017.10.23-10.29

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