Observation The VLBI observation of JVAS B1938+666 used for this work was performed using a global VLBI array combining antennas from the Very Long Baseline Array (VLBA) and European VLBI Network (EVN) at 1.7 GHz for 14 h at a data recording rate of 512 Mbits s−1 (ID: GM068; Principal Investigator: McKean). The observing strategy followed a standard phase referencing mode only for the …
Read More »A million-solar-mass object detected at a cosmological distance using gravitational imaging
