Evolution of faint radio sources in the VIDEO-XMM3 field

摘要: It has been speculated that low luminosity radio-loud AGN have the potential to serve as an important source of feedback, and may be responsible for suppressing star-formation activity in massive elliptical galaxies at late times. As such cosmic evolution these sources is vitally understanding significance feedback processes their influence on global history universe. In this paper we present a new investigation faint radio out z�2.5. We combine 1 square degree VLA survey, complete depth 100 µJy, with accurate 10 band photometric redshifts from VIDEO CFHTLS surveys. The results indicate population experiences mild positive z�1.2 increasing space density by factor �3, consistent several previous studies. Beyond z=1.2 there evidence slowing down evolution. Star-forming drive more rapid redshifts, z 1.2. best fit pure star-forming evolving (1 + z) 2.47±0.12 1.18±0.21 .