Scaling relations between the supermassive black hole mass and the host spheroid properties

Supermassive black holes in local galaxies obey a surprisingly large number of scaling laws that involve the black hole mass and various properties of the host galaxy. These 'black hole mass scaling relations' reveal a strong symbiosis between galaxies and black holes, define important constraints about their co-evolution through the cosmic time, and set the boundary conditions for theoretical models and simulations of galaxy formation. This thesis presents updates and modifications to several black hole mass scaling relations, and discusses important implications for galaxy evolution models.