![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
東京大学・天文学教育研究センターでは2003年4月から談話会を開いています。
第一線で活躍されている研究者の方々を講師にお招きし、最先端の研究成果をお話しいただきます。
講師の方には、大学院生の参加者のことも考慮し、レビュー的な側面も含めた上で、ご自身の研究紹介をお願いしています。
なお、当談話会は天文学研究者・学生を対象に大学・大学院での
専門的な研究と教育を目的として開催されています。
一般の方は公開講座・講演会などにご参加いただければ幸いです。
ML: semiadm _at_ ioa.s.u-tokyo.ac.jp
please replace _at_ with @
Language: English
Language: English
Abstract: The James Webb Space Telescope (JWST) is NASA’s flagship astronomy and astrophysics mission that was launched on December 25, 2021 and is operating in a halo orbit at Lagrange Point 2 (L2), 1.5 million km from Earth. With a 6.5-meter diameter primary mirror that is cooled to 50K and four infrared instruments, JWST is investigating four major science areas: ・First light and reionization: JWST is a powerful time machine with infrared vision that is looking back 13.5 billion years to see the first stars and galaxies forming in the early Universe. ・Assembly of galaxies: JWST’s unprecedented infrared sensitivity enables astronomers to compare the faintest, earliest galaxies to today’s spiral and elliptical galaxies, helping us understand how galaxies assemble over billions of years. ・Birth of stars and protoplanetary systems: JWST can see into massive clouds of dust that are opaque to visible-light observatories (like Hubble), where stars and planetary systems are being born. ・Planets and origins of life: JWST is telling us more about the atmospheres of extrasolar planets, and perhaps will even find the building blocks of life elsewhere in the Universe. In addition to other planetary systems, JWST will also study objects within our own solar system.
This presentation starts with the scientific motivation of JWST and reviews the major technological innovations that were needed to build the observatory. The four JWST instruments are presented with the optical path of the NIRSpec animated. The infrared focal plane arrays (FPAs) are presented and performance of the FPAs and telescope optics are reviewed; telescope performance is exceeding specification in spite of micrometeoroid hits on the primary mirror. The process of image data collection and processing is demonstrated by the iconic “Cosmic Cliffs” image (shown below). The presentation concludes with scientific examples that demonstrate the breadth of JWST capability and glimpse of the science that will be performed over the next two decades.
Language: English
Abstract: It has been 40 years since the magnetized radio filaments were first reported toward the Galactic center (GC), the first hint of an energetic activity in this region. Since then, a large number of synchrotron emitting filaments has been discovered. In particular, the recent MeerKAT survey, which has been a gold mine in the study of the extreme environment of the GC, has increased the number of filaments by an order of magnitude. In this talk, I will discuss the statistical properties of the GC filaments, the comparison of the intracluster medium (ICM) and GC filaments, models of these enigmatic objects and the association of a milli-second pulsar powering a nonthermal radio filament near the Snake. Lastly, I will present nonthermal continuum emission from the Sgr B cloud and model the interaction of the cosmic-ray electrons incident on the Sgr B cloud.
| # | Date | Speaker | Title | Chair |
| 419 | 2024年6月25日火) 11:00-12:00 | Meghan Dorn (Teledyne Scientific & Imaging) | Teledyne Imaging Sensors Infrared FPAs for Astronomy & Earth Observation | I.Sakon/K.Motohara |
| 420 | 2024年6月25日(火) 16:00-17:00 | James W. Beletic (Teledyne Scientific & Imaging) | The James Webb Space Telescope (JWST) - Humankind’s greatest space science facility | Imai/K.Motohara |
| 421 | 2024年7月3日(水) 15:30-16:30 | Farhad Yusef-Zadeh (Northwestern University) | Highlights of the MeerKAT Survey of the Galactic Center | I.Sakon/Y.Sofue |
| 422 | 2024年8月5日(月) 15:30-16:30 | 郡和範 (国立天文台科学研究部) | ダークマター・ダークエネルギーの正体を暴く天文観測 | I.Sakon |
詳細はこちら: 令和6(2024)年度談話会
| # | Date | Speaker | Title | Chair |
| 418(臨時) | 2024年6月19日(水) 14:00-14:30 | F. Peter Schloerb (Univ. of Massachusetts Amherst) | Thermal stabilization of the Large Millimeter Telescope | I.Sakon/K.Kohno |
| 417(臨時) | 2024年6月19日(水) 13:30-14:00 | David H. Hughes (Instituto Nacional de Astrofísica, Óptica y Electrónica) | The Large Millimeter Telescope (LMT) Alfonso Serrano: current status and future upgrades | I.Sakon/K.Kohno |
| 416 | 2024年6月13日(木) 15:30-16:30 | 服部公平 (統計数理研究所/国立天文台) | Dynamics and chemistry of the Milky Way revealed from Gaia data | I. Sakon |
| 415 | 2024年6月6日(木) 15:30-16:30 | Jong-Hak Woo (Seoul National University) | Understanding black hole engine based on time-domain studies | K. Morokuma |
| 414 | 2024年5月16日(木) 15:30-16:30 | Kana Morokuma (Institute of Astronomy, University of Tokyo) | Galaxy evolution in overdense environments | I. Sakon |
