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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ML: semiadm _at_ ioa.s.u-tokyo.ac.jp
please replace _at_ with @
Language: English
Abstract: Jets launched by supermassive black holes transport relativistic leptons, entrained atomic nuclei, magnetic fields, and heat from the centres of galaxies to their outskirts and beyond. These outflows embody the most energetic pathway by which galaxies respond to the surrounding Cosmic Web. Understanding black hole feedback is an active research area, with implications for galaxy evolution, the stability of galaxy clusters, and the origin of cosmic rays, heavy elements, and magnetism in the intergalactic medium. The significance of this feedback to cosmology is ultimately bounded by the reach of black hole jets, and could be sweeping if jets travel far at early epochs. In this talk, I discuss the joint LOFAR–uGMRT–Keck discovery of a black hole jet pair extending over 7 megaparsecs, currently the largest known structure made by an astrophysical body. The outflow, seen 7.5 Gyr into the past, spans two-thirds of a typical coeval cosmic void radius, thus entering voids at high (∼96%) probability. This system demonstrates that black hole–launched jets can avoid destruction by magnetohydrodynamical instabilities over cosmic distances, even at epochs when the Universe was an order of magnitude denser than it is today. Whereas previously known extreme outflows appear predominantly launched by radiatively inefficient AGN, the current outflow is launched by a radiatively efficient AGN, the type most common at early epochs. If, as implied, a larger population of early void-entering outflows existed, then black hole jets could have played an important role in cosmic magnetogenesis. This outflow shows that energy transport from supermassive black holes operates on scales of the Cosmic Web and raises the possibility that cosmic rays, heavy elements, and magnetism in the intergalactic medium have a non-local, cross-void origin.
# | Date | Speaker | Title | Chair |
423 | 2024年9月13日(金) 15:00-16:00 | Martijn Oei (Caltech) | Black hole jets on the scale of the Cosmic Web | TBA |
424 | 2024年12月12日(木) 14:55-15:55 | Takashi Okamoto (Hokkaido University) | TBD | TBA |
詳細はこちら: 令和6(2024)年度談話会
# | Date | Speaker | Title | Chair |
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 |
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 |
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 |
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 |
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 |