2013MNRAS.435.3085M

We present the results of a study of a statistically significant sample of galaxies which clearly demonstrate that supermassive black holes are generically present in all morphological types. Our analysis is based on the quantitative morphological classification of 1.12 million galaxies in the Sloan Digital Sky Survey Data Release 7 and on the detection of black hole activity via two different methods: the first one based on their X-ray/radio emission and the second one based on their mid-infrared colours. The results of the first analysis confirm the correlation between black hole and total stellar mass for eight galaxies and include one galaxy classified as bulgeless. The results of our second analysis, consisting of 15 991 galaxies, show that galaxies hosting a supermassive black hole follow the same morphological distribution as the general population of galaxies in the same redshift range. In particular, the fraction of bulgeless galaxies, 1450 galaxies or 9 percent, is found to be the same as in the general population. We also present the correlation between black hole and total stellar mass for 6247 of these galaxies. Importantly, while previous studies were limited to primarily bulge-dominated systems, our study confirms this relationship to all morphological types, in particular, to 530 bulgeless galaxies. Our results indicate that the true correlation that exists for supermassive black holes and their host galaxies is between the black hole mass and the total stellar mass of the galaxy and, hence, we conclude that the previous assumption that the black hole mass is correlated with the bulge mass is only approximately correct.