No direct coupling between bending of galaxy disc stellar age and light profiles

T. Ruiz-Lara*, I. Pérez, E. Florido, P. Sánchez-Blázquez, J. Méndez-Abreu, M. Lyubenova, J. Falcón-Barroso, L. Sánchez-Menguiano, S. F. Sánchez, L. Galbany, R. García-Benito, R. M. González Delgado, B. Husemann, C. Kehrig, Ańgel R. López-Sańchez, R. A. Marino, D. Mast, P. Papaderos, G. Van De Ven, C. J. Walcher & 2 others S. Zibetti, CALIFA team

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We study the stellar properties of 44 face-on spiral galaxies from the Calar Alto Legacy Integral Field Area survey via full spectrum fitting techniques. We compare the age profiles with the surface brightness distribution in order to highlight differences between profile types (type I, exponential profile; and II, down-bending profile). We observe an upturn ('U-shape') in the age profiles for 17 out of these 44 galaxies with reliable stellar information up to their outer parts. This 'U-shape' is not a unique feature for type II galaxies but can be observed in type I as well. These findings suggest that the mechanisms shaping the surface brightness and stellar population distributions are not directly coupled. This upturn in age is only observable in the light-weighted profiles while it flattens out in the mass-weighted profiles. Given recent results on the outer parts of nearby systems and the results presented in this Letter, one of the most plausible explanations for the age upturn is an early formation of the entire disc (~10 Gyr ago) followed by an inside-out quenching of the star formation.

Original languageEnglish
Pages (from-to)L35-L39
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume456
Issue number1
DOIs
Publication statusPublished - 11 Feb 2016

Keywords

  • techniques: spectroscopic
  • galaxies: evolution
  • galaxies: formation
  • galaxies: spiral
  • galaxies: stellar content
  • galaxies: structure

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    Ruiz-Lara, T., Pérez, I., Florido, E., Sánchez-Blázquez, P., Méndez-Abreu, J., Lyubenova, M., ... CALIFA team (2016). No direct coupling between bending of galaxy disc stellar age and light profiles. Monthly Notices of the Royal Astronomical Society: Letters, 456(1), L35-L39. https://doi.org/10.1093/mnrasl/slv174