A small radio galaxy at z = 4.026

Less than 200 radio-loud active galactic nuclei are known above redshift 4. Around 40 of them have been observed at milliarcsecond (mas) scale resolution with very long baseline interferometry (VLBI) technique. Some unresolved, compact, relativistically beamed objects, and blazars jets pointing small angles to the observer's line sight. But there also objects no sign relativistic beaming possibly having larger jet inclination angles. In a couple cases, X-ray observations indicate presence contrary VLBI measurements made European Network. J1420+1205 is prominent example, where our 30–100 mas-scale enhanced multi element remotely linked interferometer network radio revealed rich structure reminiscent galaxy. It shows bright hotspot that might be related denser interstellar medium around young galaxy an early cosmological epoch.