2 research outputs found
Star formation in CALIFA survey perturbed galaxies.III. Stellar & ionized-gas kinematic distributions
We obtain the kinematic distributions of stars (synthetic model line
absorption) and ionized gas (H line emission) for star-forming regions
residing in CALIFA survey tidally perturbed (perturbed) and non-tidally
perturbed (control) galaxies. We set the uncertainties of the velocity
dispersion by measuring the statistical variability of the datasets themselves.
Using these adopted uncertainties and considering the sensitivity of the
grating device, we establish thresholds of reliability that allow us to select
reliable velocity dispersions. From this selection, we pair the star-forming
spaxels between control and perturbed galaxies at the closest shifts in
velocity (de-redshifting). We compare their respective distributions of
velocity dispersion. In perturbed galaxies, median velocity dispersions for the
stellar and gaseous components are minimally higher and equal, respectively,
than those in control galaxies. The spread in velocity dispersion and the
velocity shift - velocity dispersion space agree with this result. Unlike the
well-known trend in strongly interacting systems, the stellar and ionized-gas
motions are not disturbed by the influence of close companions. For the gaseous
component, this result is due to the poor statistical variability of its data,
a consequence of the tightness in velocity dispersion derived from high
spectral line intensities. This analysis concludes the series, which previously
showed star-forming regions in galaxies with close companions undergoing more
prominent gas inflows, resulting in differences in their star formation and
consequent metal content