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2016.6.13-6.19

6月13日(月)13:30~15:00  太陽系小天体セミナー   南棟2階会議室
Jun 13 mon    Solar System Minor Body Seminar   Conference Room, South Bldg.2F

6月14日(火)16:00~17:00  国立天文台談話会    大セミナー室
Jun 14 tue  NAOJ Seminar      Large Seminar Room

6月15日(水)10:30~12:00  総研大コロキウム 中央棟(北)1F講義室 
Jun 15 wed    SOKENDAI colloquium    Lecture Room

6月15日(水)13:30~14:30  理論コロキウム    コスモス会館会議室
Jun 15 wed    DTA colloquium    Conference Room, Cosmos Lodge

詳細は以下をご覧下さい。

6月13日(月)

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
6月13日(月曜日)13時30分~15時
場所
南棟2階会議室
講演者
土屋智恵

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

6月14日(火)

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
6月14日(火) 16:00-17:00
場所
大セミナー室
講演者
Robert G Strom
所属
University of Arizona
タイトル
” Are We Alone? Extraterrestrial Technological Life in Our Galaxy ”
Abstract
An evaluation of the number of technological civilizations presently in our Milky Way galaxy is discussed. The current estimate of the present number of Earth-like planets (±25% of Earth’s radius) in the habitable region of Sun-like stars is about 6.6 billion.
Using a modified Drake Equation, “optimistic”, “pessimistic” and “unlikely” estimates of six constraints indicate that about
40,000 technological civilizations are presently in our galaxy for a “pessimistic evaluation”. Even “unlikely” values that are half the “pessimistic” values give over 600 technological civilizations in the galaxy. It would take a completely unrealistic value of 2.5% for each constraint to get just 1 technology (us). Therefore, we are almost surely not alone in our Milky Way galaxy.
Furthermore, almost all of the extra-solar system technologies are probably much further advanced than ours, i.e. they probably began thousands to millions of years before our Industrial Revolution.

連絡先
-名前: 阿久津 智忠

6月15日(水)

Campus
Mitaka
Seminar
SOKENDAI colloquium
Regularly Scheduled/Sporadic
Regular
Date and time
15 June 2016, 10:30-12:00
Place
Lecture Room
Speaker

Speaker 1:Tomoko Suzuki

Affiliation
D3, SOKENDAI (Supervisor; Tadayuki Kodama)
Title
Deep NIR spectroscopy for [OIII] emission line galaxies at z>3
Abstract
I will show our preliminary results obtained by recent near-infrared spectroscopy for narrow-band-selected star-forming galaxies at z>3 with Keck/MOSFIRE.
Speaker

Speaker 2:Moegi Yamamoto

Affiliation
SOKENDAOI
Title
TBD

Facilitator
-Name:Kotomi Taniguchi

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

6月15日(水)

Campus
Mitaka
Seminar
DTA colloquium
Regularly Scheduled/Sporadic
Regularly Scheduled
Date and time
15 June 2016, 13:30-14:30
Place
Conference Room, Cosmos Lodge
Speaker
Makoto Takamoto
Affiliation
The University of Tokyo
Title
Relativistic Magnetohydrodynamic turbulence in Poynting-Dominated Plasmas and its effects on Current Sheet Dynamics
Abstract
Many astrophysical phenomena are considered that the ambient plasma is very high-Reynolds number flows, and should be in a turbulent state. In particular, many high energy astrophysical phenomena are also believed to be in high-sigma state, that is, the plasma is in a Poynting-dominated state. To investigate such phenomena, we need a theory of turbulence of relativistic magnetohydrodynamics (RMHD) with relativistically strong background magnetic field. However, there are very few study of relativistic turbulence, and many properties are still unknown. In this seminar, we report on our recent findings of the RMHD turbulence in a Poynting-dominated plasma, in particular, effects of compression mode. We performed a series of 3-dimensional RMHD simulations with decaying trans-Alfvenic turbulence. We found that the generation of compressible mode shows different behavior from non-relativistic case, such as an increase of compression mode power with back ground sigma parameter and effects from shock waves. We also discuss the turbulent effects on magnetic reconnection.

Facilitator
-Name:Tomoya Takiwaki

Comment
in English

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