(Proposal ID) S13B-119

(PI) Inoue, Akio

(Proposal Title)
Spatial segregation of galaxy populations in the SSA22 z=3.1 proto-cluster

(Abstract)
There is a massive proto-cluster at z = 3.1 traced by Ly alpha emitters (LAEs) 
in the SSA22 field. In the same field, we have found 73 Lyman continuum 
emitters (LCEs) and 95 sub-mm galaxies (SMGs) by our previous observations. 
The LCEs are LAEs emitting strong Lyman continuum (lambda_rest < 912Angstrom). 
We find that the LCEs are distributed on the periphery or in the outside of 
the LAE proto-cluster, and indeed, the LCE-LAE angular cross-correlation shows 
no correlation between them. On the other hand, bright SMGs reside in the 
proto-cluster and the bright SMG-LAE angular cross-correlation shows their 
good correlation. This spatial segregation of the two different populations 
of galaxies is very interesting and is a new clue to understand the physical 
mechanism of the escape of the Lyman continuum and environmental effects of 
clusters of galaxies on formation and evolution of galaxies. However, 
a limited number of LCEs and no SMGs have spectroscopic redshifts obtained 
so far. Therefore, we propose a redshift survey of the LCEs and SMGs with 
Gemini/GMOS-N in order to measure redshifts of these galaxies and to 
establish the spatial segregation of the galaxy populations in the 
proto-cluster.