Velocity Dispersion saper Aperture Corrections as a Function of Galaxy Properties from Integral-field Stellar Kinematics of 10,000 MaNGA Galaxies

The second moment of the stellar velocity within the effective radius, denoted by s(e)(2), is a crucial quantity in galaxy studies, as it provides insight into galaxy properties and their mass distributions. However, large spectroscopic surveys typically do not measure se directly, instead providing saper, the second moment of the stellar velocity within a fixed fiber aperture. In this paper, we derive an empirical aperture correction formula, given by s(aper)/s(e) = (R-aper/R-e)(s), using spatially resolved stellar kinematics extracted from approximately 10,000 Sloan a Digital Sky Survey-Mapping Nearby Galaxies at Apache Point Observatory integral field unit observations. Our analysis reveals a strong dependence of a on the r-band absolute magnitude Mr, g-i color, and S & eacute;rsic index nSer, where a values are lower for brighter, redder galaxies with higher S & eacute;rsic indices. Our results demonstrate that the aperture correction derived from previous literature on early-type galaxies cannot be applied to predict the aperture corrections for galaxies with intermediate S & eacute;rsic indices. We provide a lookup table of a values for different galaxy types, with parameters in the ranges of -18 > M-r > -24, 0.4 < g-i < 1.6, and 0 < n(Ser) < 8. A Python script is provided to obtain the correction factors from the lookup table.

Automated summary

This paper derived an empirical aperture correction formula and provided a lookup table of correction factors for different galaxy types. They also provided a Python script to obtain the correction factors from the lookup table.