Unifying the Scaling Relations in Galactic Bulges – an Implication of Bulge Formation
Issue: 2013 - Volume 3 [Issue 3]
Chan Man Ho *
Department of Physics and Institute of Theoretical Physics, the Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
*Author to whom correspondence should be addressed.
Aims: I present the derivation of some important scaling relations in galactic bulges by using a simple model of bulge formation.
Methodology: If the radiation pressure of the bulge suppresses its accretion of mass, together with the bulge luminosity-mass relation and the supermassive black hole (SMBH)- velocity dispersion relation, we can obtain a set of scaling relations such as those relating the mass of SMBH to bulge mass and luminosity, the Faber-Jackson and the fundamental plane relations.
Results: All these derived scaling relations agree with the empirical fittings from the observations.
Conclusion: All the scaling relations derived are consistent with the observational data. Therefore, the radiation pressure of the bulge provides a significant role to connect all the scaling relations together.
Keywords: Galaxies, galactic centre, supermassive blackholes, velocity dispersion