11月20日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Nov 20 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
11月20日（火）13：30～14：30 理論コロキウム 講義室
Nov 20 Tue DTA colloquium Lecture-room
11月20日（火）16：00～17：00 国立天文台談話会 大セミナー室
Nov 20 Tue NAOJ Seminar Large Seminar Room
11月21日（水）10：30～12：00 総研大コロキウム 講義室
Nov 21 Wed SOKENDAI colloquium Lecture Room
詳細は以下をご覧下さい。
11月20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
- 11月20日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 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
11月20日（火）
- Campus
- Mitaka
- Seminar
- DTA colloquium
- Regularly Scheduled/Sporadic
- Regularly Scheduled
- Date and time
- November 20, 2018, 13:30-14:30
- Place
- Lecture room
- Speaker
- Yuri Fujii
- Affiliation
- Nagoya University
- Title
- Formation of Circumplanetary Disks and Regular Moons
- Abstract
- During the formation phase of gas giants, circumplanetary gaseous disk form around the planets. Circumplanetary disks are important not only for mass supply to gas giants but also for formation of regular satellites. Because of the comparatively small size-scale of the sub-disk, quick magnetic diffusion prevents the magnetorotational instability (MRI) from being well-developed at ionization levels that would allow MRI in the parent protoplanetary disk. In the absence of significant angular momentum transport, continuous mass supply from the parental protoplanetary disk leads to the formation of a massive circumplanetary disk. We have developed an evolutionary model for this scenario and have estimated the orbital evolution of satellites within the disk. In a certain temperature range, we find that inward migration of a satellite can be stopped by a disk structure due to the opacity transitions. We also find that the second and third migrating satellites can be captured in mean motion resonances. In this way, a compact system in Laplace resonance, which are similar to inner three bodies of Galilean satellites, can be formed in our disk models.
- Facilitator
- -Name：Tomoya Takiwaki
- Comment
- in English
11月20日（火）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Tuseday, Nov. 20 16:00-17:00
- Place
- Large Seminar Room
- Speaker
- Andrea Merloni
- Affiliation
- Max-Planck Institute for Extraterrestrial Physics
- Title
- “Understanding AGN evolution with large (X-ray) surveys: current constraints and prospects for eROSITA ”
- Abstract
-
The emergence of the three-dimensional structure of the cosmic web over the history of the Universe displays
very distinctive features when observed in X-rays, where both the most massive collapsed structure
(clusters of galaxies) and the most energetic events in the life of galaxies (AGN and Quasars) reveal themselves
unambiguously.
In the past 50 years, astronomers have used X-ray surveys to tackle fundamental questions for structure
formation such as: How did supermassive black holes form and grow in the nuclei of galaxies? Why are their
physical properties today so tightly linked to those of their hosts? What was the impact on the surrounding
structures of the copious energy release, either in radiative or mechanical form, associated to the growth of
such black holes in active galactic nuclei (AGN)? I will show how state of the art observations with Chandra
and XMM-Newton have been used to give at least partial answers to some of these questions. I will also
highlight the major limitation of existing X-ray surveys: many crucial aspects of the study of the connection
between AGN and host galaxies cannot be explored because of the limited volume of the Universe explored.
The next generation of wide-area, sensitive X-ray surveys designed to map the hot and energetic Universe
will be heralded by eROSITA (extended ROentgen Survey with an Imaging Telescope Array), the core
instrument on the Russian-German Spektrum-Roentgen-Gamma (SRG) mission, scheduled for launch in 2019.
eROSITA will perform a deep survey of the entire X-ray sky, and will be about 30 times more sensitive than
ROSAT in the soft energy band (0.5-2 keV), while in the hard band (2-8 keV) it will provide the first ever true
imaging survey of the full sky. eROSITA is expected to yield a sample of around 3 million active galactic nuclei,
which is bound to revolutionize our view of the evolution of supermassive black holes and their impact on
the process of structure formation in the Universe. - Facilitator
- -Name： Matsuda, Yuichi
11月21日（水）
- Campus
- Mitaka
- Seminar
- SOKENDAI colloquium
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- November 21, 2018, 10:30 -12:00
- Place
- Lecture Room
- Speaker
- Shigeru Namiki
- Affiliation
- SOKENDAI 2nd year (M2)(Supervisor: Yusei Koyama,Masato Onodera,Masayuki Tanaka)
- Title
- The relation between galaxy chemical evolution and its outflow/inflow parameters.
- Abstract
- (optional)
Please note that the presenter information posted here is not necessarily listed in order of presentation.
- Facilitator
- -Name：Yoshiki Hatta
- Comment
- TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.