CALIFA color/metallicity gradients connections Virtual Observatory Resource

  1. Marino R.A.
  2. Gil de Paz A.
  3. Sanchez S.F.
  4. Sanchez-Blazquez P.
  5. Cardiel N.,Castillo-Morales A.
  6. Pascual S.
  7. Vilchez J.
  8. Kehrig C.
  9. Molla M.,Mendez-Abreu J.
  10. Catalan-Torrecilla C.
  11. Florido E.
  12. Perez I.
  13. Ruiz-Lara T.,Ellis S.
  14. Lopez-Sanchez A.R.
  15. Gonzalez Delgado R.M.
  16. De Lorenzo-Caceres A.,Garcia-Benito R.
  17. Galbany L.
  18. Zibetti S.
  19. Cortijo C.
  20. Kalinova V.
  21. Mast D.,Iglesias-Paramo J.
  22. Papaderos P.
  23. Walcher C.J.
  24. Bland-Hawthorn J.,(the Califa Team)
  25. Published by

We study, for the first time in a statistically significant and well-defined sample, the relation between the outer-disk ionized-gas metallicity gradients and the presence of breaks in the surface brightness profiles of disk galaxies. Sloan Digital Sky Survey (SDSS) g'- and r'-band surface brightness, (g'-r') color, and ionized-gas oxygen abundance profiles for 324 galaxies within the Calar Alto Legacy Integral Field Area (CALIFA) survey are used for this purpose. We perform a detailed light-profile classification, finding that 84% of our disks show down- or up-bending profiles (Type II and Type III, respectively), while the remaining 16% are well fitted by one single exponential (Type I). The analysis of the color gradients at both sides of this break shows a U-shaped profile for most Type II galaxies with an average minimum (g'-r') color of ~0.5mag and an ionized-gas metallicity flattening associated with it only in the case of low-mass galaxies. Comparatively, more massive systems show a rather uniform negative metallicity gradient. The correlation between metallicity flattening and stellar mass for these systems results in p-values as low as 0.01. Independent of the mechanism having shaped the outer light profiles of these galaxies, stellar migration or a previous episode of star formation in a shrinking star-forming disk, it is clear that the imprint in their ionized-gas metallicity was different for low- and high-mass Type II galaxies. In the case of Type III disks, a positive correlation between the change in color and abundance gradient is found (the null hypothesis is ruled out with a p-value of 0.02), with the outer disks of Type III galaxies with masses <=10^10^M_{sun}_ showing a weak color reddening or even a bluing. This is interpreted as primarily due to a mass downsizing effect on the population of Type III galaxies that recently experienced an enhanced inside-out growth.

  1. galaxies
  2. photometry
  3. visible-astronomy
  4. sloan-photometry
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