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Report from Tsukuba Group (From Galaxies to LSS)

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1 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

2 Contents Basic Problems Survey Observations Non-Survey Observations

3 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?

4 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?

5 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?

6 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

7 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

8 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?

9 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 △角運動量

10 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

11 Theoretical Frameworks
Mori & Umemura (2006) Hirashita et al. (2002) Reconstruction of galaxy evolution scenario by dust evol.

12 Large Scale Structure Suwa et al. (2006, in prep)
Young Halos (< 0.1 Gyr)

13 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

14 Theoretical Frameworks
+ Dust evolution model (Hirashita et al. 2004) Mori et al. (2004)


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