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。
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専門的な研究と教育を目的として開催されています。
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ML: semiadm _at_ ioa.s.u-tokyo.ac.jp
please replace _at_ with @
Language: 英語 (English)
Abstract: The Circinus galaxy hosts the closest type 2 Seyfert active galactic nucleus (AGN), located at a distance of 4.2 Mpc. The molecular emission of the interstellar medium can be observed with spatial resolutions up to about 1 pc. The Circinus galaxy contains a massive gas disk within its inner 30 pc with a moderate velocity dispersion of 20 km/s. I will present an analytical model of a turbulent, clumpy, star-forming disk that reproduces spatially resolved observations of six molecular lines and three continuum bands in the central 30 pc of the Circinus galaxy. When the properties of the stellar disk are used as input and matched to the line and continuum emission, the model yields the Toomre Q parameter, the mass accretion rate, the metallicity, and the cosmic ray ionization rate. These, in turn, are used to infer gas properties, such as surface density, velocity dispersion, radial velocity, and star formation rate. Unlike typical large-scale galactic disks, the viscous timescale is shorter than the gas consumption timescale, and the energy injection rate into the ISM (and thus the gas distribution within the disk) is dominated by gas inflow through the disk rather than the supernova rate. I will put our findings in context with another nearby type 2 AGN, NGC 1068.
| # | Date | Speaker | Title | Chair |
| 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 |
詳細はこちら: 令和8(2026)年度談話会
| # | Date | Speaker | Title | Chair |
| 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 |