Radio continuum imaging has been a key approach to trace the production of stars and the activity of supermassive black holes at redshifts 0<z<5 – a cosmic epoch marked by the dominant fraction of star formation that is obscured by dust. In recent years, our team has pushed the resolution and sensitivity limits of the Very Large Array (VLA) to obtain some of the deepest and sharpest radio continuum images ever obtained, providing unique constraints on the radio emission of galaxies at high redshifts. In this talk, I will present multi-frequency VLA radio surveys in the GOODS-N, CEERS and Abell2744 fields that reach sub-μJy sensitivity and sub-arcsecond resolution at 3-10 GHz. After summarizing the available data products, I will provide an overview of the different science topics that are being addressed with these data sets; such as the estimation of the cosmic star formation rate density of the universe from free-free radio emission, multi-band radio morphology of high-redshift galaxies, and constraints on the radio emission of the so-called “little red dots” recently discovered in deep JWST images. Finally, I will highlight the imaging challenges faced to produce and characterize the aforementioned radio surveys, which will be key to obtain future SKA and ngVLA blind radio surveys.
