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高密度領域になるほど、 [OII] emitter の割合が高い → [OII] emission は星生成の指標となるので、高密度領域でも星生成が活発であることを示している。. [OII] EW (Å). Surface Density (Mpc -2 ). ( Gomez et al. 2003, ApJ, 584, 210 ). limiting EW obs ~ 26 A limiting SFR ~ 11 M sun yr -1. 5824 NB-excess objects. 3σ(iz - NB816). iz - NB816 = 0.2. - PowerPoint PPT Presentation
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COSMOS z ~ 1.2 ()()()() COSMOS1. Introduction2. Sample3. Results5. SummaryCosmic Evolution Survey (COSMOS)2 ( 10+2)HSTMotivation (SFRD)900Myrsz = 3 1 (e.g., Madau et al. 1996) z ~1
cosmic variance COSMOS2[OII] z~1.2(Takahashi et al. 2007, ApJS, 172, 456)
[OII]: Haz ~ 1
emitter fractionstar formation activity [OII] emitter sample(@ z=1.17-1.20) NB-excess objectcolor[OII] emitter 3176 objects
(See Takahashi et al. 2007, ApJS, 172, 456)(1) [OII] fraction vs. local density@ z~1.2local surface density[OII] emitter10th(2) Environmental effect on star formation activity z~0 vs. z~1 @z~0@z~1.2star formation activity ?!!(3) Galaxy morphologyHST/ACS (isolated)(non-isolated)non-isolated galaxieslocal densityz ~ 1.2z ~ 02non-isolated galaxies[OII] sample75non-[OII] sample583non-isolated galaxiesnon-isolated galaxiesfraction41z~3z~1-3z~0COSMOS surveyphoto-z catalogz=1.17-1.20Subaru i < 241533NB816 [OII] emitteremitterz~1.2local surface densityPhoto-z sample [OII] emitter 10[OII]@z ~ 1.2local density (10)
r : target10non-isolated galaxies fraction[OII] sample:75%non-[OII] sample:58%[OII] sample non-isolated galaxy [OII]
non-isolated galaxiesfraction
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