Galaxy clusters, the largest gravitationally bound systems, are an important subject of study to place constraints on cosmological models. Moreover, they are excellent places to test galaxy evolution models in connection to their environments. To date, massive clusters have been found unexpectedly (Kang & Im 2009; Gonzales et al. 2012) and the evolution of galaxies in clusters is still controversial (Elbaz et al. 2007; Faloon et al. 2013). Finding galaxy cluster candidates at z > 1 in a wide, deep imaging survey data will enable us to solve such issues of modern extragalactic astronomy. We report new candidate galaxy clusters in one of the wide and deep survey fields, the European Large Area ISO Survey North1 (ELAIS-N1) and North2 (ELAIS-N2) fields, covering a sky area of 8.75 deg2 and 4.85 deg2 each. We also suggest a new useful color selection technique to separate z > 1 galaxies from low - z galaxies by combining multi-wavelength data.

ABSTRACT
1. INTRODUCTION
2. DATA
3. NEW COLOR SELECTION METHOD
4. GALAXY CLUSTER CANDIDATES AT z > 1
5. CONCLUSIONS
REFERENCES

• Minhee Hyun(Center for the Exploration of the Origin of the Universe(CEOU), Astronomy Program, Dept. of Physics and Asronomy, Seoul National University)
• Myungshin Im(Center for the Exploration of the Origin of the Universe(CEOU), Astronomy Program, Dept. of Physics and Asronomy, Seoul National University)
• Jae-Woo Kim(Center for the Exploration of the Origin of the Universe(CEOU), Astronomy Program, Dept. of Physics and Asronomy, Seoul National University)
• Seong-Kook Lee(Center for the Exploration of the Origin of the Universe(CEOU), Astronomy Program, Dept. of Physics and Asronomy, Seoul National University)