Triangulum galaxy
Triangulum is classified as unbarred, but another look at the galaxy shape shows a weak bar-like structure around the galactic nucleus. The center of this galaxy  is the most luminous source of X-rays in the Local Group of galaxies. However, the center does not appear to contain a supermassive black hole, as an upper limit of 3,000 solar masses is placed on the mass of a central black hole based upon the speed of stars in the core region.