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. 312: October 12 (Thu), 2017, 15:30 - 16:30

Speaker: Jonathan Freundlich (Racah Institute of Physics, The Hebrew University)

Title: Molecular gas reservoirs during the winding-down of star formation

Abstract: Star formation in the Universe decreased by an order of magnitude in the last ten billion years. Probing the molecular gas reservoirs from which stars are formed is crucial to understand this winding-down of star formation. The PHIBSS2 legacy program at the IRAM NOEMA interferometer surveys the molecular gas properties of galaxies at different redshifts on and around the main sequence, where most of star formation occurs. It notably contributes to show that the cosmic evolution of the star formation rate is mainly driven by that of the molecular gas fraction, albeit with a small inflexion of the star formation efficiency. At z=0.5-0.8, we observe the CO(2-1) line for 61 targets, from which we determine molecular gas masses, gas fractions and depletion times. We separately obtain disk sizes and bulge-to-total luminosity ratios, which enable us to characterize morphological changes. The Kennicutt-Schmidt relation between molecular gas and star formation rate surface densities is strikingly linear, which argues in favor of uniform star formation processes across cosmic time. Our results also suggest an ongoing supply of molecular gas to compensate for star formation and a contribution of disk stars to the growing bulge.

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
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 formation
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

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

これまでの談話会


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