# Pipe3D Stellar and Gaseous Velocity Dispersions for CALIFA Galaxies

## TL;DR

This paper provides detailed measurements of stellar and gaseous velocity dispersions in CALIFA galaxies, compares them with literature, and explores their use in constructing revised galaxy scaling relations.

## Contribution

It introduces a comprehensive set of velocity dispersion measurements from CALIFA data, distinguishing between stellar and gas components, and assesses their effectiveness in galaxy scaling relations.

## Key findings

- Stellar and gas dispersions are not interchangeable and have distinct features.
- The best correlation with virial velocity uses K ~ 0.5 in the S_K parameter.
- Minimal reduction in scatter when using velocity-based relations compared to luminosity-velocity relations.

## Abstract

We present tables of velocity dispersions derived from CALIFA V1200 datacubes using Pipe3D. Four different dispersions are extracted from emission (ionized gas) or absorption (stellar) spectra, with two spatial apertures (5'' and 30''). 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_K^2 = K V_rot^2 + sigma^2 constructed with each of our dispersions. Our search for the strongest linear correlation between S_K and i-band absolute magnitudes favors the common K ~ 0.5, though the range 0.3 - 0.8 is statistically acceptable. The reduction of scatter in our best stellar mass-virial velocity relations over that of a classic luminosity-velocity relation is minimal; this may however reflect the dominance of massive spirals in our sample.