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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
Abstract: Gaseous media in the universe are essential to both galaxy evolution and the growth of supermassive black holes. In this talk, I will introduce two distinct projects we have undertaken that each focus on gaseous environments through different observational approaches. The first part focuses on the gaseous environment in the vicinity of active galactic nuclei (AGNs). In this project, we utilized the infrared flux variability, which is characteristic of the AGN, to distinguish between dusty gas and dust-free gas components around the AGN for the first time, and discussed the radiation-pressure effect on these different gas structures. I will also present our recent results on variability analysis of the broad Halpha line for local AGNs with unique characteristics uncovered by our independent analysis. The second part focuses on the gaseous environment in submillimeter galaxies (SMGs). In this project, we performed [CII]158µm observations using ALMA for 16 flux-limited SMGs at z = 3-5, originally detected by the SCUBA-2 survey. Thanks to the bright nature of our sample, we successfully detected the [CII] line with S/N>10. Most of the detected [CII] lines exhibit complex profiles that reflect the kinematics of [CII]-emitting gas. Here, I will present our results regarding comparisons between [CII] luminosity and physical properties, such as star formation rate and molecular gas mass, as well as comparisons between [CII] and CO line profiles.
| # | Date | Speaker | Title | Chair |
| 446 | 2026年10月15(木) 15:30-16:30 | Shoichiro Mizukoshi (ASIAA) | Observational Studies of Gaseous Environments: From Local AGNs to Distant SMGs | I. Sakon |
| 447 | 2026年10月28(水) 15:30-16:30 | Jahang Prathap Puthan Kallayi (Macquarie University in Sydney, Australia) | TBD | I. Sakon |
| 448 | 2026年11月20日(金) TBD | Daniel Lin (NRAO Jansky Fellow) | TBD | 天文教室と共催 |
| 449 | 2026年11月26日(木) 15:30-16:30 | Kohki Uno (Columbia Astrophysics Laboratory, NY, USA) | TBD | I.Sakon |
| 450 | 2026年11月27日(金) 15:00-16:00 | Tony Travouillon (The Australian National University) | Wide-Field Infrared projects for transient astronomy: An Australian perspective | TBD |
| 451 | 2026年12月1日(火) TBD | Izaskun Jimenez-Serra (Centro de Astrobiologia (CSIC-INTA), Spain) | TBD | 天文教室と共催 |
詳細はこちら: 令和8(2026)年度談話会
| # | Date | Speaker | Title | Chair |
| 445 | 2026年8月19(水) 13:30-14:30 | Jyoti Prakash (the Inter-University Centre for Astronomy and Astrophysics, India) | Building from a break-up: Tidal dwarf galaxies at the extremities and tidal bridge in the Guitar galaxy Arp 105 | K. Kohno |
| 444 | 2026年7月31(金) 15:30-16:30 | Jeremy Lim (University of Hong Kong) | Dark Matter under the Gravitational Lens | K. Kohno |
| 443 | 2026年7月9(木) 15:00-16:00 | Bernd Vollmer (Universite de Strasbourg, CNRS, Observatoire astronomique de Strasbourg)) | Gas accretion and star formation in the inner 30 pc of the Circinus galaxy | I. Sakon |
| 442 | 2026年6月11(木) 15:30-16:30 | Tom Bakx (Chalmers University of Technology, Sweden) | When the Universe Turned Dark: Tracing Cosmic Dust from the Big Bang to Present Day | I. Sakon |
| 441 | 2026年5月28日(木) 15:30-16:30 | James Jackson (NRAO, USA) | [C II] and [O I] Absorption and Self-Absorption from the “Skins” of Clouds | I. Sakon |
| 440 | 2026年4月16日(木) 15:00-16:00 | Joss Bland-Hawthorn (Director, Sydney Institute for Astronomy, U Sydney) | The long-term evolution of turbulent discs in high-redshift galaxies | 天文教室と共催 |
| 439 | 2026年4月14日(火) 16:15-17:15 | Donald Figer (Rochester Institute of Technology, USA) | Photon Counting CMOS Imaging Detectors for Optical and UV Astrophysicss | 天文教室と共催 |
