J-PLUS: 2-D analysis of the stellar population in NGC 5473 and NGC 5485
  The spatial variations of stellar population properties within a galaxy are
intimately related to their formation process. Therefore, spatially resolved
studies of galaxies are essential to uncover their formation and assembly. The
Javalambre Photometric Local Universe Survey (J-PLUS) is a dedicated
multi-filter designed to observed ~8500 deg2 using twelve narrow-,
intermediate- and broad-band filters in the optical range. In this study, we
test the potential of the multi-filter observation carried out with J-PLUS to
investigate the properties of spatially-resolved nearby galaxies. We present
detailed 2D maps of stellar population properties (age, metallicity,
extinction, and stellar mass surface density) for two early-type galaxies
observed in both, J-PLUS and CALIFA surveys: NGC 5473 and NGC 5485. Radial
structures are also compared and luminosity- and mass-weighted profiles are
derived. We use MUFFIT to process the J-PLUS observations, and two different
techniques (STARLIGHT and STECKMAP) to analyze IFU CALIFA data. We demonstrate
that this novel technique delivers radial stellar population gradients in good
agreement with the IFU technique CALIFA/STECKMAP although comparison of the
absolute values reveals the existence of intrinsic systematic differences.
Radial stellar population gradients differ when CALIFA/STARLIGHT methodology is
used. Age and metallicity radial profiles derived from J-PLUS/MUFFIT are very
similar when luminosity- or mass-weighted properties are used, suggesting that
the contribution of a younger component is small. Comparison between the three
methodologies reveals some discrepancies suggesting that the specific
characteristics of each method causes important differences. We conclude that
the ages, metallicities and extinction derived for individual galaxies not only
depend on the chosen models but also depend on the method used.
