What is actually the center of the galaxy here? Is it the bright star or something nearby it?
This image is based on a combined data set from the MeerKAT radio telescope. The processing is described in The 1.28 GHz MeerKAT Galactic Center Mosaic. This paper includes a replica of the image above (with a different palette) along with celestial and galactic coordinates. I am reproducing the image below. The direction of the center of the galaxy is located the intersection of the to galactic coordinate lines $l=0.0°$ and $b=0.0°$.