お知らせ †
今後2週間の予定 †
→カレンダーはこちら
※下記のセミナーの他に新着論文紹介のセミナー（10:00-10:30）が、月曜日、水曜日、金曜日にあります。場所は4号館ピロティです。
2020-04-06
(月) 観測的宇宙論速報
内容：添付ファイル [添付] 参照
Author(s)TitleYear, Journal,Number(,Link)Y. SutoJinsei Ippan ni Sotairon2010, ISBN978-4-13-063354-3
2020-04-09
(木) 宇宙物理学セミナーUTAPwiki/セミナー/宇宙物理学セミナー
Speaker: Tatsuya Matsumoto
Title: Dynamics of an emission centroid during Sgr A* flares
Abstract:
Sgr A* is a supermassive BH in our Galaxy confirmed by long-term monitoring of stellar orbits.
The luminosity of Sgr A* is usually very small (~10^8 times smaller than its Eddington luminosity), but sometimes it rises up suddenly, so-called flare events. Flares are most noticeable in near-infrared and X-ray bands, where the luminosity increases from a quiescent level of ~10^{33-34} erg/s to a peak level of ~10^{35} erg/s. Although several flare models have been proposed, their origin is still uncertain. Recently, the Gravity collaboration carried out an interferometric observations of NIR flares and detected a motion of an emission centroid with an astrometric accuracy of ~10^{-5} arcsecond. They fit the observed trajectory with a circular Kepler orbit and find the best-fit radius of 7-10 gravitational radius. However, their best-fit orbit lies entirely inside of the trajectory because the small radius is required to reproduce the duration.To resolve this problem, we fit the observed trajectory with different models and I will discuss our results.
2020-04-13
(月) 観測的宇宙論速報
内容：添付ファイル [添付] 参照
Author(s)TitleYear, Journal,Number(,Link)Y. SutoJinsei Ippan ni Sotairon2010, ISBN978-4-13-063354-3
|
セミナー週間予定 †
UTAPゼミ週間予定 †
![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")