Velocity dispersions for CALIFA Galaxies

Four different dispersions are extracted from emission (ionized gas) or absorption (stellar) spectra, with two spatial apertures (5 and 30arcsec). Stellar and ionized gas dispersions are not interchangeable and we determine their distinguishing features.

We also compare these dispersions with literature values and construct sample scaling relations to further assess their applicability. We consider revised velocity-based scaling relations using the virial velocity parameter S^2^_K_=KV^2^_rot_+{sigma}^2^ constructed with each of our dispersions. Our search for the strongest linear correlation between S_K_ and i-band absolute magnitudes favours the common K~0.5, though the range 0.3-0.8 is statistically acceptable.