Discovery of bright z ~ 7 galaxies in the UltraVISTA survey
R. A. A. Bowler, J. S. Dunlop, R. J. McLure, H. McCracken, B., Milvang-Jensen, H. Furusawa, J. P. U. Fynbo, O. Le Fevre, J. Holt, Y. Ideue,, Y. Ihara, A. B. Rogers, Y. Taniguchi

TL;DR
This study utilizes deep multi-wavelength imaging from the UltraVISTA survey to identify and analyze a small sample of credible luminous galaxies at redshift z ~ 7, providing insights into early galaxy formation.
Contribution
First credible z ~ 7 Lyman-break galaxy candidates in the COSMOS field identified using multi-wavelength data and photometric redshift fitting.
Findings
Identified up to ten galaxy candidates at z > 6.5.
Confirmed four robust z > 6.5 galaxies with detailed properties.
Refuted previous z ~ 7 galaxy claims in the COSMOS field.
Abstract
We have exploited the new, deep, near-infrared UltraVISTA imaging of the COSMOS field, in tandem with deep optical and mid-infrared imaging, to conduct a new search for luminous galaxies at redshifts z ~ 7. The unique multi-wavelength dataset provided by VISTA, CFHT, Subaru, HST and Spitzer over a common area of 1 deg^2 has allowed us to select galaxy candidates at z > 6.5 by searching first for Y+J-detected (< 25 AB mag) objects which are undetected in the CFHT+HST optical data. This sample was then refined using a photometric redshift fitting code, enabling the rejection of lower-redshift galaxy contaminants and cool galactic M,L,T dwarf stars.The final result of this process is a small sample of (at most) ten credible galaxy candidates at z > 6.5 which we present in this paper. The first four of these appear to be robust galaxies at z > 6.5, and fitting to their stacked SED yields z…
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