| Summary: | 碩士 === 國立臺灣師範大學 === 地球科學系 === 100 === To study the environment of high-redshift star-forming galaxy — submillime- ter galaxies (SMGs) — and their role during large-scale structure formation, we have estimated the galaxy number density fluctuations around SMGs, and analyzed their cross correlation functions with lyman alpha emitters (LAEs), and optically-selected galaxies with photometric redshift in the COSMOS and ECDFS fields. We first measured the galaxy density around SMGs based on SMGs with photometric redshift zSMG compiled from data obtained by LABOCA and AzTEC in the ECDFS field. The number density of surrounding galaxies within projected radius of 1–2 Mpc and zSMG ± 0.1 suggests a marginal signal of excess galaxy count at z ∼ 2.5 and ∼ 3.5, although the uncertainty of redshift estimate is still large. We have further investigated the density of passive and starforming BzK galaxies at similar redshift around SMGs and find that BzKs have overdensity around LABOCA-SMGs at radius smaller than 1 Mpc, espe- cially passive BzKs. On the other hand, our second task, the cross correlation functions between SMGs and LAEs, detects no correlation signal between the two populations, even after the exclusion of the SMGs with redshift significantly far from that of LAEs. Finally we discuss the property of the large scale struc- ture where SMGs are located and the interconnection between SMGs and other high-redshift galaxy populations.
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