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#author("2026-07-09T05:29:20+00:00","default:wwwadm","wwwadm") #author("2026-07-15T12:57:34+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] --------------------------------------------------------- * 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: 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: 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. ** No. 444 : July 31, 2026 (Fri) 15:30-16:30 [#l8e44296] *** Place: Lecture room, Institute of Astronomy, University of Tokyo /Zoom (hybrid) [#r300819d] *** Speaker: Prof. Jeremy Jin Leong Lim (University of Hong Kong) [#p2132ea2] *** Title: Dark Matter under the Gravitational Lens [#c8087b7e] Language: 英語 (English) Abstract: The existence of Dark Matter (DM) is the clearest sign that the Standard Model of particle physics is incomplete. Hypothetical particles invoked by different theoretical extensions to the Standard Model currently constitute the leading candidates for DM: the identification of the DM particle will therefore point the correct path towards New Physics. In lieu of a laboratory detection, the most powerful tool for elucidating the particle nature of DM is provided by gravitational lensing. In this talk, I present two tests of the DM particle - in particular, whether it comprises ultra-massive particles such as WIMPs or ultra-light particles such as Axions. First, we show that lensing anomalies (an over 2-decade-old problem in astrophysics) can be resolved if quantum interference among ultra-light DM particles generate pervasive density modulations in the DM halos of galaxies. Second, in a clean test for distinguishing between WIMPs and ultra-light Axions, we show that observations of lensed star transients in the Dragon Arc demand pervasive density modulations in the DM halos of galaxy clusters. These tests tilt the balance toward New Physics invoking ultra-light particles such as Axions. --------------------------------------------------------- --------------------------------------------------------- * 今後の講演予定 [#ac94b97b] |BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):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 | |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| *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| |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 | --------------------------------------------------------- *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]]
