#author("2019-11-22T04:34:18+00:00","default:wwwadm","wwwadm")
#author("2020-03-03T08:02:59+00:00","default:wwwadm","wwwadm")
*IoA Seminar 2019 / 平成31年度/2019年度・東京大学・天文学教育研究センター・談話会 [#t8e79eca]

#contents

* Upcoming Seminars [#ebd6a62d]

** No. 357: 5 December 2019 (Thu) 15:30 - 16:30 [#je71137c]
*** Speaker: Dr. Hiroaki Sameshima (IoA/U.Tokyo) [#e84a2194]
*** Title: Spectroscopic studies on quasars and stars [#n1cdb512]
** No. 359: 19 March 2020 (Thu) 15:30 - 16:30 [#q46a6504]
*** Speaker: Dr. WU, Po-Feng 吳柏鋒 (East Asian Core Observatory Association Fellow) [#ee2536f5]
*** Title: The blind men and the elephant: Multiple evolutionary paths from star-forming galaxies to quiescence [#o9ee6295]

Abstract: 
I will talk about two topics related to spectroscopic studies of quasars and stars in the optical and near-infrared regions:
 
(1) Quasar elemental abundances are expected to provide unique probes of high-redshift star formation and galaxy formation. Using the archival optical spectra of SDSS quasars at 0.7 < z < 1.6, we measured Fe II and Mg II emission-line strengths and estimated [Mg/Fe] abundance ratios from them in combination with photoionization simulations. The derived abundance ratios are consistent with chemical evolution models, which validates our abundance estimate. However, because chemical evolution models are degenerated at 0.7 < z < 1.6 regardless of the star formation history, we could not put any strong constraints on it. Future observations with the forthcoming TAO instruments (NICE, SWIMS) would shed light on the evolution of [Mg/Fe] abundance ratio at 3 < z < 7.
 
(2) WINERED is a near-infrared high-resolution echelle spectrograph that simultaneously covers the wavelength range of 0.91-1.35 micron with a resolving power of ~28000 (WIDE mode). As a member of the WINERED team, I have tackled correction of an observed spectrum for telluric absorption, which is an unavoidable problem for ground-based telescopes. We succeeded to correct telluric absorption with high accuracy by using the spectrum of a telluric standard star whose stellar features were carefully removed. By applying this method to a spectrum of the A-type star 21 Lyn obtained with WINERED, we identified 219 atomic lines. Intriguingly, a curve of growth created from the measured C I lines showed large scattering that cannot be explained by measurement errors. This result, combined with other near-infrared spectroscopic studies, implies that not a few of oscillator strengths of near-infrared lines need calibrations based on astronomical observation.
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. 

Language: slides in English, talk in Japanese
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. 

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** No. 358: 12 December 2019 (Thu) 15:30 - 16:30 [#je71137c]
*** 講師: 坂野正明 (ワイズバベル) [#r29897e5]
*** 題目: 「英語の『数』を考える —— 冠詞、単数複数、非可算」 [#p0a05ad3]

要旨: 

科学論文の英文校閲の現場で遭遇する多種多様な問題の中で、修正する箇所として最も多いのは、ほぼ例外なく冠詞と可算非可算、単数複数の用法です。筆者が相当の英語上級者であっても、いやむしろあればこそ、割合的にその点が頻出修正事項になります。不幸なことに、冠詞と名詞の単複ほど本質的に校閲が難しい点はありません。なぜならば、基本的な誤りでない限り、文法的にはどちらでも正当であることが普通だからです。
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しかし、いかに文法的に正しくても、冠詞と単複を誤ると、文意が筆者の意図と大きく異なってしまうことがままあります。正確さと精密さとが命の科学論文においては、書く場合はもちろん読む場合でさえ、これは致命的になりかねません。そんな時、文法的には正しい以上、読者が読み取る判断の拠り所は、文章の背景知識に基づいた「常識」だけになります。ところが、例えば「太陽は1個」が世の常識であっても、天文屋の常識は異なることもありましょう。あるいは自ら開発した装置の「常識」を読者に要求するのは無理難題というものです。究極的には、筆者の意図に沿った「正しい」冠詞や単複は、筆者にしか説明できないものなのです。

本講演では、自身かつては天文学研究者であり、近年は一流の天体物理論文の校閲を数多く請負った講演者により、日本人科学者による誤用の実例も使いながら、英語の冠詞と数詞のテーマに構造的に切り込みます。日本語ネイティブならではの視点から、実用的な対策も提案します。

--
Masa Sakano, PhD
Wise Babel Ltd
URI: http://www.wisebabel.com/
Twitter/Facebook: @WiseBabel


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* 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, [[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]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.

**日時 [#ve668db6]
-木曜日
-15:30-16:30

**場所 [#j9cedf34]
-天文センター講義室

**標準タイムテーブル [#b66015f3]
|13:30-14:30|[[院生コロキウム:http://www.ioa.s.u-tokyo.ac.jp/colloquium/wiki/]]|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~|

**世話人 [#q8bd3108]

please replace _at_ to @

- Kotaro KOHNO 河野孝太郎 kkohno _at_ ioa.s.u-tokyo.ac.jp 
- Masuo TANAKA 田中培生 mtanaka _at_ ioa.s.u-tokyo.ac.jp
- Ryou OHSAWA 大澤亮 ohsawa _at_ ioa.s.u-tokyo.ac.jp
- Yuu NIINO 新納悠 yuuniino _at_ ioa.s.u-tokyo.ac.jp




** Schedule [#ac94b97b]
|BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):Chair|
|357|2019/12/05(Thu) 15:30 - 16:30 | 鮫島寛明 Hiroaki Sameshima (IoA/U.Tokyo) | Spectroscopic studies on quasars and stars | KK |
|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 |
|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 |









**終了した談話会(2019年度) [#h9b1f387]
詳細はこちら: [[平成31(2019)年度談話会]]
|BGCOLOR(cyan):#|BGCOLOR(cyan): Date|BGCOLOR(cyan):Speaker|BGCOLOR(cyan):Title|BGCOLOR(cyan):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 |

**これまでの談話会 [#e657f394]
-[[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]]
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