Position Measurements of the Core in 3C 66B

摘要

It was argued that 3C 66B, a nearby radio galaxy, harbors a supermassive black hole binary (SMBHB). To investigate this, a 4-epoch VLBA phase referencing imaging observation was performed in 2004-2005. Here we present some preliminary results of this project. We found a large position difference compared to previous results.