Optical-faint compact radio sources
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This work investigates a population of bright, compact radio sources that are very faint in optical, which has never been studied before in a comprehensive manner. The sample consists of 135 radio sources selected from the Radio Fundamental Catalog (RFC). These sources have accurate VLBI positions, have ultra-compact radio morphologies (<10 mas), are strong in radio (median flux density [about]100 mJy), and yet are completely invisible in the SDSS DR10 data. While it is natural to guess that the OFCORS are powerful AGN, their exact nature is unclear. This multiwavelength study was performed by obtaining deeper optical imaging with OSMOS, CFHT, and PanSTARRS, perform SED fitting to determine the sources properties, explore the K-z andW1-z relations, and determine the power law in the infrared and radio regime.
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