Authors: Nandini Sahu, Alister W. Graham, Benjamin L. Davis
Using 143 early- and late-type galaxies (ETGs and LTGs) with directly-measured super-massive black hole masses (MBH), we build upon our previous discoveries that: (i) LTGs, most of which have been alleged to contain a pseudobulge, follow the relation MBH ∝ M∗,sph2.16±0.32 ; and (ii) the ETG relation M∗,sph1.27±0.07 is an artifact of ETGs with/without disks following parallel M∗,sph1.9±0.2 relations which are offset by an order of magnitude in the MBH-direction. Here we searched for substructure in the MBH–(central velocity dispersion, σ) diagram using our recently published, multicomponent, galaxy decompositions; investigating divisions based on the presence of a depleted stellar core (major dry-merger), a disk (minor wet/dry-merger, gas accretion), or a bar (evolved unstable disk). The Sérsic and core-Sérsic galaxies define two distinct relations: MBH ∝ σ5.86±0.33 and MBH ∝ σ8.54±1.07, with Δrms|BH = 0.51 and 0.47 dex, respectively. We also report on the consistency with the slopes and bends in the galaxy luminosity (L)-σ relation due to Sérsic and core-Sérsic ETGs, and LTGs which all have Sérsic light-profiles. The bend in the MBH-Sérsic diagram (superficially) reappears upon separating galaxies with/without a disk, while we find no significant offset between barred and non-barred galaxies, nor between galaxies with/without active galactic nuclei. We also address selection biases purported to affect the scaling relations for dynamically-measured MBH samples. These new, type-dependent, MBH--σ relations more precisely estimate MBH in other galaxies, and hold implications for galaxy/black hole co-evolution theories, simulations, feedback, the pursuit of a black hole fundamental plane, and calibration of virial f-factors for reverberation-mapping.