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Abstract: One of the big unsolved questions in galaxy evolution is how the star-formation activity in galaxies stop and the transformation of morphologies, and how this process and governing mechanisms evolve in cosmic time.
This talk will focus on z=1 and later, the period that the cosmic star-formation rate density drops rapidly. I will introduce our recent large spectroscopic campaign, the LEGA-C survey, which obtains 3000 ultra-deep optical spectra of galaxies z~1 using 100 nights of the Very Large Telescope. The high-S/N spectra probe the ages and the assembly histories of galaxies through stellar continua. Combing the structural parameters from HST images, I will demonstrate that there is no one simple mechanism that can explain the complex correlation between the formation histories and structures of galaxies. The majority of galaxies likely went through a gentle process that shuts down star-formation slowly without altering the structure, while some galaxies are experiencing rapid change in both star-formation rate and structural at the same time.
I will further show follow-up studies on post-starburst galaxies, those undergo the rapid decline of star-formation rates, to investigate the driving mechanisms. Various pieces of evidence suggest that post-starburst galaxies had a centrally-concentrated starburst event before the star-formation activity halts.
Note: we will provide a zoom link, so you can join the seminar remotely.
東京大学・天文学教育研究センターでは2003年4月から, 院生コロキウムに引き続き, 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.
| 13:30-14:30 | 院生コロキウム | 講義室 |
| 15:30-16:30 | 談話会 | 講義室 |
| 16:30- | お茶の時間 | 講義室横のお茶部屋~講師の方を交えて~ |
please replace _at_ to @
| # | Date | Speaker | Title | Chair |
| 359 | 2020/3/19(Thu) 15:30 - 16:30 | 吳柏鋒 Wu, Po-Feng (EACOA Fellow/NAOJ) | The blind men and the elephant: Multiple evolutionary paths from star-forming galaxies to quiescence | KK |
詳細はこちら: 平成31(2019)年度談話会
| # | Date | Speaker | Title | Chair |
| 345 | 2019/04/01(Mon) 15:30 - 16:30 | J. Xavier Prochaska (UCO/Lick Observatory) | The Wolfe Disk: ALMA Discoveries of Distant, HI-selected Galaxies | KK |
| 346 | 2019/06/27(Thu) 15:30 - 16:30 | Yuu NIINO (IoA/Univ. of Tokyo) | The origin of short and intense explosions in the universe | KK |
| 347 | 2019/07/02(Tue) 16:00 - 17:00 | Wakiko ISHIBASHI (University of Zurich) | How AGN radiative feedback may shape black hole-galaxy co-evolution | KK |
| 348 | 2019/07/04(Thu) 15:30 - 16:30 | Hidenobu YAJIMA (Univ. of Tsukuba) | Cosmological simulations of galaxy formation at the epoch of reionization | KK |
| 349 | 2019/07/11(Thu) 15:30 - 16:30 | Fumihiko USUI (Kobe University) | 近赤外線分光観測による小惑星の含水鉱物探査 | RO |
| 350 | 2019/08/26(Mon.) 15:30 - 16:30 | Glenn Orton (NASA/JPL) | The Exploration of Jupiter by the Juno Mission | RO |
| 351 | 2019/10/2(Wed) 13:15 - 14:15 | 吉田健二 Kenji Yoshida (芝浦工業大学) | Correlations between Optical/Infrared and Gamma-ray Variability in Bright Well-Monitored Blazars 2008-2017 | YN |
| 352 | 2019/10/24(Thu) 15:30 - 16:30 | 橋本哲也 Tetsuya Hashimoto (台湾国立清華大学) | Recent three discoveries from NTHU cosmology group | YN |
| 353 | 2019/10/28(Mon) 13:00 - 14:-0 | Kevin Fogarty (Caltech) | Cooling and Condensation in Cool-Core Galaxy Clusters: the Case of MACS 1931.8-2635 | KK |
| 354 | 2019/10/31(Thu) 15:30 - 16:30 | 徳田一起 Kazuki Tokuda (Osaka Prefecture University) | ALMAによる大小マゼラン雲とM33の巨大分子雲観測 ALMA observations of GMCs in the Large/Small Magellanic Clouds and M33 | KK |
| 355 | 2019/11/07(Thu) 15:30 - 16:30 | 高倉理 Satoru Takakura (IPMU/U.Tokyo) | A measurement of the degree-scale CMB polarization with POLARBEAR | KK |
| 356 | 2019/11/14(Thu) 14:30 - 15:30 | Ewine van Dishoeck (Leiden Univ.) | Molecules from clouds to disks and planets | KK |
| 357 | 2019/12/05(Thu) 15:30 - 16:30 | 鮫島寛明 Hiroaki Sameshima (IoA/U.Tokyo) | Spectroscopic studies on quasars and stars | YN |
| 358 | 2019/12/12(Thu) 15:30 - 16:30 | 坂野正明 Masaaki Sakano (Wise Babel) | 英語の『数』を考える — 冠詞、単数複数、非可算 | KK |
