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The primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to findwell screened galaxy candidates at z>7 (z' dropout) in the Extended ChandraDeep Field-South (ECDFS). To this end, TENIS provides relatively deep J and Ksdata (~25.3 ABmag, 5-sigma) for an area of 0.5*0.5 degree. Leveraged withexisting data at mid-infrared to optical wavelengths, this allows us to screenfor the most luminous high-z objects, which are rare and thus require a surveyover a large field to be found. We introduce new color selection criteria toselect a z>7 sample with minimal contaminations from low-z galaxies andGalactic cool stars; to reduce confusion in the relatively low angularresolution IRAC images, we introduce a novel deconvolution method to measurethe IRAC fluxes of individual sources. Illustrating perhaps the effectivenessat which we screen out interlopers, we find only one z>7 candidate, TENIS-ZD1.The candidate has a weighted z_phot of 7.8, and its colors and luminosityindicate a young (45M years old) starburst galaxy with a stellar mass of3.2*10^10 M_sun. The result matches with the observational luminosity functionanalysis and the semi-analytic simulation result based on the MillenniumSimulations, which may over predict the volume density for high-z massivegalaxies. The existence of TENIS-ZD1, if confirmed spectroscopically to be atz>7, therefore poses a challenge to current theoretical models for how so muchmass can accumulate in a galaxy at such a high redshift.

The Taiwan ECDFS Near-Infrared Survey: Very Bright End of the Luminosity Function at z>7