PHD Thesis

We have performed careful, multi-component, photometric-decompositions of the largest-to-date sample of galaxies with dynamically measured (central) SMBH masses. These decompositions enabled us to measure the bulge masses and reliably identify the galaxy morphologies. We explored the black hole mass scaling relations for various sub-morphological classes of the galaxies, including galaxies with and without a rotating stellar disk, early-type (E, ES, S0) versus late-type galaxies (all spirals), barred versus non-barred galaxies, and Sérsic versus core-Sérsic galaxies. Consequently, we have discovered significantly modified correlations of black hole mass with galaxy properties, i.e., the spheroid/bulge stellar mass, the total galaxy stellar mass, the central stellar velocity dispersion, central luminosity/mass concentration (Sérsic index), effective half-light radius, and the internal/spatial stellar mass density. 

The final scaling relations are dependent on galaxy morphology, which is fundamentally linked with the formation and evolutionary paths of galaxies. These modified scaling relations more accurately predict the black hole masses in other galaxies, pose ramifications for the virial-mass f-factor, and offer insights into simulations and theories of black hole-galaxy co-evolution. Additionally, these scaling relations will improve the predictions for the ground-based and space-based detection of long-wavelength gravitational waves by the pulsar timing arrays and the upcoming Laser Interferometer Space Antenna (LISA), respectively.