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Report from Tsukuba Group (From Galaxies to LSS)
平下 博之(H. Hirashita) (筑波大学) 中井直正、梅村雅之、諏訪多聞、渡部靖之 ほか、筑波大学宇宙グループ
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Contents Basic Problems Survey Observations Non-Survey Observations
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1. Basic Problems Astronomically important observations with ALMA(天文学の財産になる観測) ・on basic problems on galaxies and AGNs ・chance of obtaining new knowledge with long observational time ★What is the basic problems about galaxies and AGNs? ★Is there any key phenomena or key physical processes?
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3D Problem in the Universe
梅村さんメモ1 3D Problem in the Universe Dark Matter: 暗黒物質の正体は? Dark Age: 暗黒物質の宇宙史は? Dark Energy: 宇宙を加速膨張させるエネルギー?
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First Objects and Cosmic Reionization
梅村さんメモ2 First Objects and Cosmic Reionization Pop III IMFは? First Pop III clusterはできるか? First AGN (SMBH)はいつどのようにできるか? Cosmic Reionizationはいつ何によってもたらされたか?
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Three Challenges to CDM
梅村さんメモ3 Three Challenges to CDM Substructure Problem:衛星銀河の数が理論予想よりはるかに少ない Down-sizing Problem(銀河&SMBH):大きな銀河&SMBHから形成される High-z大規模構造問題:z > 3でLAE&LBGの大規模構造が存在する
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Galaxy Formation 楕円銀河形成問題(Elliptical Galaxy Formation)
梅村さんメモ4 Galaxy Formation 楕円銀河形成問題(Elliptical Galaxy Formation) LAE、LBG、ERO、SCUBA objectsとの関係 Bulge-BH関係の起源 渦巻銀河形成問題(Spiral Galaxy Formation) なぜ回転中心(銀河中心)を持てるのか? なぜ矮小渦巻銀河はないのか? 矮小楕円銀河との関係は? Progenitorが見つかっていない
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Five Big Problems on Globular Clusters
梅村さんメモ5 Five Big Problems on Globular Clusters Age Problem:LCDMの宇宙年齢が超えるものも存在する Relation with Reionization ? Why compact?:Dwarf Spheroidalとの違いは? Why small fraction:Total mass~銀河質量の1/100 Metallicity Problem:No GCs with Z < 10– 3 Zsun Why?
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Galaxy Properties 銀河のタイプ dE E S0 S dIrr △光度Lsun 106-9 109-12 107-9
梅村さんメモ6 銀河のタイプ dE E S0 S dIrr △光度Lsun 106-9 109-12 107-9 △輝度分布 exp R1/4 △Color blue red Very blue △金属量Zsun < 0.5 3 2 1 0.01 – 0.1 △Mvir/L 10-100 10 7 5 4 △bulge/disk High Low △銀河密度 △Gas Fraction Small Large ×球状星団数 多 少 △角運動量 低 高
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2. Survey Observations Understand the relation between ALMA galaxies and LAE, LBG, ERO, etc. See the large scale structures And obtain an overall understanding of galaxy evolution
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Theoretical Frameworks
Mori & Umemura (2006) Hirashita et al. (2002) Reconstruction of galaxy evolution scenario by dust evol.
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Large Scale Structure Suwa et al. (2006, in prep)
Young Halos (< 0.1 Gyr)
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3. Non-Survey Observations
Observations of individual LAEs and LBGs Relation between AGN and star formation, Presence/Absence of AGNs in high-z galaxies Relation with first galaxies and dark age AGNに関しては、渡部氏講演
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Theoretical Frameworks
+ Dust evolution model (Hirashita et al. 2004) Mori et al. (2004)
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