IoA Seminar 2017 / 平成29年度/2017年度・東京大学・天文学教育研究センター・談話会

Upcoming Seminars

No. 313: October 26 (Thu), 2017, 15:30 - 16:30

Speaker: Jürgen Stutzki (Universität zu Köln)

Title: Optical depth of the [CII] 158 um fine structure line emission:

high spectral resolution observations with SOFIA/upGREAT

Abstract: The fine structure line of ionized carbon, [CII], at 158 μm is one of the strongest cooling lines of the dense interstellar medium. Located in the core region of the far-infrared spectral range, it is observable in the local universe only from space, balloon or airborne platforms, or at high redshifts in the ALMA bands, where it is used as tracer of star formation activity in early galaxies. The recent technological advances now allow routine highest spectral resolution heterodyne observations with the upGREAT instrument on board SOFIA, that resolve the [13CII] satellite lines with sufficient signal/noise, so that it is possible to measure directly the optical depth of the carbon fine structure line emission. We have performed such observations in seven sources ranging from simple to complex spatial and kinematic morphology. In all cases, we find clear evidence of significant optical depth. In many cases, the line profiles show clear evidence for foreground or self-absorption. The high column densities derived and, in many cases, the low temperatures of the foreground/self-absorption, are difficult to account for in standard model scenarios of photodissociation regions (PDRs). These findings imply, that one has to use with caution integrated line intensity ratios, when interpreting [CII] observations in the context of PDR models, to infer average properties of spectroscopically and spatially unresolved sources.

Language: English


趣旨

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.

日時

場所

標準タイムテーブル

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~

世話人

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Schedule

#DateSpeakerTitleChair
3132017/10/26 (Thu) 15:30 - 16:30Juergen Stutzki (Universitaet zu Koeln)Optical depth of the Carbon 158 um line emission: high spectral resolution observations with SOFIA/upGREATKK
3142017/11/16 (Thu) 15:30 - 16:30藤澤幸太郎 (早稲田大学)TBA
31X2017/12/07 (Thu) 15:30 - 16:30小西美穂子 (NAOJ 特任研究員)TBA
31X2017/12/21 (Thu) 15:30 - 16:30大屋 瑶子 (東京大学物理学専攻)TBAKK

終了した談話会(2017年度)

詳細はこちら: 平成29 (2017) 年度談話会

#DateSpeakerTitleChair
3012017/4/13 (Thu) 15:30 - 16:30Tao WANG (IoA/U.Tokyo (4月から))New insights into the formation of the most massive galaxies at high redshiftsKK
3022017/4/20 (Thu) 15:30 - 16:30Matthew W. Johns (U. Arizona)The Magellan Experience - Building a 6.5 Meter Optical/Infrared TelescopeTT
3032017/4/27 (Thu) 15:30 - 16:30滝脇知也 (国立天文台 理論部)重力崩壊型超新星の爆発機構MY
3042017/5/11 (Thu) 15:30 - 16:30樫山和己 (東京大学 物理学専攻)A FRB in a bottleMY
3052017/5/25 (Thu) 15:30 - 16:30西村優里 (天文学教育研究センター (4月から))低重元素量の矮小銀河における分子雲の化学組成KK
3062017/6/1 (Thu) 15:30 - 16:30片岡章雅 (国立天文台フェロー)Millimeter-wave polarization as a tool of investigating the planet formationKK
3072017/6/15 (Thu) 15:30 - 16:30端山和大 (東京大学 宇宙線研)重力波望遠鏡の現状と、検出から物理へMT
3082017/6/22 (Thu) 15:30 - 16:30福島登志夫 (国立天文台)宇宙人存在問題 Question on Alien Civilization ExistenceTT
3092017/7/13 (Thu) 15:30 - 16:30Ryan M. Lau (Caltech/JPL)High Energy, Cool Transients: Investigating Infrared-Luminous Outbursts with SpitzerKK
3102017/7/20 (Thu) 15:30 - 16:30木坂将大 (青山学院大学)多波長観測で探るパルサー磁気圏構造MY
3112017/7/27 (Thu) 15:30 - 16:30馬場彩 (東京大学 物理学専攻)超新星残骸のX線観測に関する最近の話題MY
3122017/10/12 (Thu) 15:30 - 16:30Jonathan Freundlich (Racah Institute of Physics, The Hebrew University)Molecular gas reservoirs during the winding-down of star formationMY

これまでの談話会


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