RCSEDv2: homogenization of multi-wavelength photometric data
  RCSEDv2 (https://rcsed2.voxastro.org/), the second Reference Catalog of
Spectral Energy Distributions of galaxies includes the largest homogeneously
processed photometric dataset for 4 million galaxies assembled from several
wide-field surveys. Here we describe the methodology of the photometric data
homogenization. We first correct all photometric measurements for the
foreground Galactic extinction, then convert them into the photometric system
we adopted as a standard (GALEX + SDSS + UKIDSS + WISE). We computed aperture
corrections into several pre-defined apertures by using published galaxy sizes
/ light profiles and image quality for each of the surveys. We accounted for
k-corrections using our own analytic approximations. Such a homogeneous
photometric catalog allows us to build fully calibrated SEDs for the galaxies
in our sample (defined by the availability of their spectra) and enables direct
scientific analysis of this unique extragalactic dataset.
