Discovery of 24 radio-bright quasars at 4.9<z<6.6 using low-frequency radio observations

Properties of newly discovered high-z quasars (4.9<z<6.6) derived from photometric and spectroscopic observations. The radio measurements have been obtained using the LOFAR Two Metre Sky Survey (LoTSS-DR2; 144 MHz), VLA FIRST (1.4 GHz), and Very Large Array Sky Survey (VLASS; 2-4 GHz). The spectroscopic observations have been conducted using the Faint Object Camera and Spectrograph on the Subaru telescope, LRS2 on the Hobby-Eberly Telescope, and LRIS on Keck. The rest-frame UV magnitudes have been derived by combining the optical to mid-infrared observations and performing spectral energy distribution fitting using the template fitting code EAZY (Brammer et al 2008).