NOAO >   Observing Info >   Approved Programs >   2014A-0164

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Proposal Information for 2014A-0164


PI: Kyoung-Soo Lee, Purdue University, soolee@purdue.edu
Address: Physics Department, 525 Northwestern Avenue, West Lafayette, IN 47906, USA

CoI: Arjun Dey, NOAO
CoI: Hanae Inami, NOAO
CoI: Buell Jannuzi, University of Arizona
CoI: Naveen Reddy, UC Riverside
CoI: Sungryong Hong, NOAO

Title: Unveiling the Most Massive Structure at z=3.78

Abstract: In the hierarchical framework, the highest density peaks mark the sites of the earliest and largest galaxy formation. Identifying these high-redshift ``proto-cluster'' would improve our understanding of the formation and evolution of these massive systems and their constituent galaxies. In 2012A, we used the Mayall+Mosaic to obtain deep narrow- and broad-band images and confirmed the presence of a massive proto- cluster at z=3.78. The structure mapped by the current data consists of 62 Ly(alpha) emitters (LAEs) at z=3.785+/-0.015; the overall density ~ 2x larger than that expected for the field LAEs. Furthermore, there are three regions that each contain >=9 LAEs within 8 Mpc radius circle, within which relative enhancement with respect to the field is a factor of ~8. Unfortunately, the largest overdensity known thus far appears to lie at the extreme southern end of the coverage at the nexus of two converging filaments. This apparent geometry of the structure mapped by the existing data strongly suggests that the densest core of this structure has yet to be mapped in the south, beyond the extent of the current coverage. We propose to take deep imaging data on this southern field at the depth comparable to our existing data. We will (1) map the entire spatial extent of this massive protocluster within 60 Mpc from center; (2) trace the large scale environment within which this cluster is embedded (i.e., structure core, filaments, and voids).


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