Supermassive black holes do not correlate with galaxy disks or pseudobulges

It is thought that there is a supermassive black hole at the centre of most large galaxies. Two papers in this issue go some way to solving the mystery of what mechanisms are involved in feeding such black holes. The first combines a survey of pseudobulge classifications for a sample of nearby galaxies with recent measurements of velocity dispersions in the biggest bulgeless galaxies to confirm that black holes do not correlate with disks or with pseudobulges. And the second shows that there is almost no correlation between dark matter and parameters that measure black holes unless the galaxy also contains a bulge.