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
- 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
- Affiliation
- SOKENDAOI
- Title
- TBD
- Facilitator
- -Name：Kotomi Taniguchi
- Comment
- TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.
Speaker 1：Tomoko Suzuki
Speaker 2：Moegi Yamamoto
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
以上