Distinct stellar populations in the inner bars of double-barred galaxies

摘要: Numerical simulations of double-barred galaxies predict the build-up different structural components (e.g. bulges, inner discs) in central regions disc galaxies. In those simulations, bars have a prominent role internal secular evolution their host The development bulges and discs is, however, poorly understood observationally due to small number studies focusing on stellar populations these systems. order provide constraints relevant processes inducing creation presence bars, we carried out detailed kinematical population analysis sample four galaxies, ranging from SB0 SBb, observed with integral-field spectroscopy. We find that present distinct properties, being younger more metal-rich than surrounding outer bars. While detect signatures gas inflow through no evidence associated star-forming or newly formed structures around them. This result suggests that, regardless formation scenario, at are playing moderate even minor morphological this