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#author("2026-06-04T05:37:13+00:00","default:wwwadm","wwwadm") #author("2026-06-15T00:40:15+00:00","default:wwwadm","wwwadm") * IoA Seminar 2026 / 令和8年度(2026年度) 東京大学天文学教育研究センター談話会 [#c9bc2851] #contents * 本談話会について [#c1b638ff] ** 趣旨 [#d48cd456] 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。&br; 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>https://www.u-tokyo.ac.jp/ja/society/visit-lectures/d04_01.html]]などにご参加いただければ幸いです。 **定例日時 [#ve668db6] - 木曜日 15:30-16:30 **場所 [#j9cedf34] - 天文センター講義室と zoom のハイブリッド開催を予定 **世話人（天文センター） [#q8bd3108] ML: semiadm _at_ ioa.s.u-tokyo.ac.jp please replace _at_ with @ - 2025年度 -- SAKON, Itsuki 左近 樹 isakon_at_ ioa.s.u-tokyo.ac.jp -- Kohno, Kotaro 河野孝太郎 kkohno_at_ioa.s.u-tokyo.ac.jp -- Kamizuka, Takafumi 上塚貴史 kamizuka_at_ioa.s.u-tokyo.ac.jp **天文学教室談話会について [#ecc2eb80] - 天文学教室談話会については、[[こちら>http://www.astron.s.u-tokyo.ac.jp/seminar/seminar/]]をご覧ください。 * Upcoming Seminars [#ebd6a62d] --------------------------------------------------------- ** No. 442 : June 11, 2026 (Thu) 15:30-16:30 [#dad05fe7] * 講演リスト [#w4d60d77] ** No. 443 : July 9, 2026 (Thu) 15:00-16:00 [#dad05fe7] *** Place: Lecture room, Institute of Astronomy, University of Tokyo /Zoom (hybrid) [#va7fc746] *** Speaker: Tom Bakx (Chalmers University of Technology,, Sweden) [#d2a6b465] *** Title: When the Universe Turned Dark: Tracing Cosmic Dust from the Big Bang to Present Day [#kf065e92] *** Speaker: Prof. Bernd Vollmer (Universite de Strasbourg, CNRS, Observatoire astronomique de Strasbourg) [#d2a6b465] *** Title: Gas accretion and star formation in the inner 30 pc of the Circinus galaxy [#kf065e92] Language: 英語 (English) Abstract: Roughly half of all starlight ever emitted has been absorbed by interstellar dust and re-radiated at far-infrared wavelengths, fundamentally shaping our view of galaxy evolution. Even at 600 million years after the Big Bang, galaxies harbour warm dust reservoirs rivaling the brightest local systems. Yet despite the high stellar masses revealed by JWST (implying millions of dust-producing supernovae), deep ALMA observations detect no dust emission, highlighting our uncertainties in the emergence, evolution and impact of dust across the past 13.8 billion years. I will present an overview of our best constraints on early obscured galaxy evolution. Using ALMA Bands 1 through 10 efficiently, I detail our best picture on resolved dust, gas and star formation maps in 200 dusty star-forming galaxies, revealing the diversity of extreme star formation modes. Furthermore, I systematically investigate their larger environments through a novel machine learning framework, exploring the dust-selected protocluster candidates from substantial archival datasets (>2000 hours) combined with ongoing spectroscopic programs. Extending dust studies to younger galaxies, I will present a picture of dust formation and emission properties from composite ALMA imaging out to the pre-reionization Universe, concluding with recommendations for next-generation facilities (AtLAST, ALMA2040). 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. --------------------------------------------------------- * 今後の講演予定 [#ac94b97b] |BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):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 | |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 | *終了した談話会(2026年度) [#h9b1f387] 詳細はこちら: [[令和8(2026)年度談話会]] |BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):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 | --------------------------------------------------------- *これまでの談話会 [#e657f394] -[[令和8(2026)年度談話会]] -[[令和7(2025)年度談話会]] -[[令和6(2024)年度談話会]] -[[令和5(2023)年度談話会]] -[[令和4(2022)年度談話会]]（天文学教育研究センター・天文学教室合同談話会） -[[令和3(2021)年度談話会]]（天文学教育研究センター・天文学教室合同談話会） -[[令和2(2020)年度談話会]] -[[平成31(2019)年度談話会]] -[[平成30 (2018) 年度談話会]] -[[平成29 (2017) 年度談話会]] -[[平成28 (2016) 年度談話会]] -[[平成27 (2015) 年度談話会]] -[[平成26 (2014) 年度談話会]] -[[平成25 (2013) 年度談話会]] -[[平成24 (2012) 年度談話会]] -[[平成23 (2011) 年度談話会]] -[[平成22 (2010) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H22.html]] -[[平成21 (2009) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H21.html]] -[[平成20 (2008) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H20.html]] -[[平成19 (2007) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H19.html]] -[[平成18 (2006) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H18.html]] -[[平成17 (2005) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H17.html]] -[[平成16 (2004) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H16.html]] -[[平成15 (2003) 年度談話会:http://www.ioa.s.u-tokyo.ac.jp/danwakai//past/danwakai_H15.html]]
