10月30日（火）13：30～15：00 太陽系小天体セミナー 南棟２階会議室
Oct 30 Tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
10月30日（火）13：30～15：00 太陽天体プラズマセミナー すばる棟 大セミナー室
Oct 30 Tue Solar and Space Plasma Seminar Large Seminar Room.
10月31日（水）15：30～17：30 太陽系科学セミナー すばる棟 大セミナー室
Oct 31 Wed Solar System Science Seminar Large Seminar Room.
11月1日（木）16：00～17：00 国立天文台談話会 大セミナー室
Nov 1 Thu NAOJ Seminar Large Seminar Room
11月2日（金）16：00～17：00 国立天文台談話会 大セミナー室
Nov 2 Fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
10月30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30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
10月30日（火）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Sporadic
- Date and time
- 30 October (Tue), 13:30-15:00
- Place
- Large Seminar Room, Subaru Bldg.
- Speaker
- Kirill Kuzanyan
- Affiliation
- IZMIRAN
- Title
- Magnetic helicity and tilt of bipolar structures in solar active
regions: the observable statistical data and development of the global dynamo and sunspot formation models - Abstract
- There is a handful of observable information on sunspot tilts for about one century, which is supported by the tilt data of magnetic bipolar structures for a few recent decades. Furthermore, for the three recent solar cycles we have direct proxies of magnetic helicity in the solar surface. These two groups of observational data enable us to develop a self-consistent model of the solar dynamo which is constrained both by the sunspot and magnetic helicity dynamics. Furthermore, having recently developed physical models of formation of solar active regions, we may now propose a mechanism of origin and development of tilt helicity due to that process. We compare the results of our model estimates with global dynamo model results and with available data series on tilts.
- Facilitator
- -Name：Shin Toriumi
- Comment
10月31日（水）
- 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
- 10月31日（水曜日）15時30分～17時30分
- 場所
- 大セミナー室
- 講演者
- 吉田二美
- 所属
- 千葉工業大学 惑星探査研究センター
- タイトル
- 【活動的小惑星勉強会 7】2017年12月の最接近はPhaethonの何をどこ
まで明らかにしたか？ - Abstract
- 近地球小惑星であり活動的小惑星でもある小天体(3200) Phaethonは
その発見時よりよく研究されて来た。
最近ではこの天体がDESTINY+ミッションのターゲットに選定され、国際的な地上
観測キャンペーンの呼びかけを行ったため2017(平成29)年12月の地球への接近
(最接近距離<0.07au)時には世界各地の研究者が様々な方法でこの天体を観測
し、多くの知見が得られた。
今回の講演ではこの最接近時に得られた最新の観測データを元にして執筆・出版
された論文を幾つか紹介する。
また、2017年より古い観測から知られていた様々な事実と比較し、この興味深い
天体の起源と進化に関する物理的描像を皆さんと議論したい。 - 連絡先
- -名前： 伊藤孝士
- 備考
- テレビ会議による参加も可
11月1日（木）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Thursday, Nov 1 16:00-17:00
- Place
- Large Seminar Room
- Speaker
- Sara Ellison
- Affiliation
- University of Victoria
- Title
- ” Galaxy mergers in the nearby universe”
- Abstract
-
Galaxy-galaxy mergers represent one of the most fundamental processes at work in galaxy evolution,
being not only responsible for the growth of mass, but also triggering radical changes in star formation,
AGN activity and morphology. In this talk, I will present observational results from large surveys of
nearby galaxy mergers that have allowed us to obtain a panchromatic view of these processes,
tracing the multi-faceted features of galaxy mergers ranging from their star formation, chemistry,
and nuclear activity to their morphologies and gas content. I will also present new results, obtained
from studying galaxy mergers with the MaNGA survey, which have provided the first statistical
look at spatially resolved profiles of star formation and metallicity in late stage galaxy mergers. - Facilitator
- -Name： Narukage, Noriyuki
11月2日（金）
- Campus
- Mitaka
- Seminar
- NAOJ seminar
- Regularly Scheduled/Sporadic
- Scheduled
- Date and time
- Friday, Nov 2 16:00-17:00
- Place
- Large Seminar Room
- Speaker
- Ignacio G. de la Rosa
- Affiliation
- Astrophysical Institute of the Canary Islands
- Title
- ” The case of the missing compact galaxies”
- Abstract
-
Massive compact galaxies, known to be abundant in the past (some 10 billion years ago)
are generally thought to be almost extinct in the present Universe.
Several interpretations have been proposed to explain their surprising transformation between
“ancient compact” into “modern diffuse” massive galaxies. Unexpectedly, recent observational
studies have revealed that, instead of vanishing, the majority of the compact galaxies have
survived, hidden by stellar disks or halos.Hydrodynamical cosmological simulations, such as Illustris, are used to shed light on this
controversy. Simulations are not only able to reproduce realistic galaxies, but they also span
a sufficiently large volume to include some of the rarest objects, like the compact galaxies.
We use these simulations to track the evolution of individual high-redshift compact galaxies.
Key processes such as expansion, compaction and disk formation around a compact core
have been traced in detail. Additionally, the rather uncommon “relic galaxies”, thought to be
living fossils of the ancient compact galaxies, are also interpreted in the light of the simulations. - Facilitator
- -Name： Narukage, Noriyuki