Observation target of VERTECS is extragalactic background light (EBL). The EBL is accumulated radiation integrated from early universe to present epoch and is crucial quantity to reveal star formation history. In the near-infrared wavelength, intensity of the EBL is reportedly several times higher than that of integrated light of known galaxies. This result suggests presence of large amount of unidentified faint objects in the universe. Possible candidates have been assumed as first stellar objects including primordial blackholes or intra halo light in local universe. These objects are expected to show different radiation spectrum in visible wavelength. Therefore, VERTECS will conduct visible multi-color observation and reveal origin of the excess component of the EBL.
