Effect of bars in galaxy properties

SOL ALONSO; MATIAS VERA; GEORGINA COLDWELL; DIEGO G. LAMBAS

Córdoba

Workshop; Friends of Friends Meeting; 2015

Observatorio Astronómico de Córdoba

With the aim of assessing the effects of  bars on galaxy properties, we present an analysis of  characteristics of galaxies with and without bars.We selected spiral face-on galaxies from the Sloan Digital Sky Survey Data Release 7 (SDSS-DR7) brighter than $g-$mag$<$16.5. By visual inspection of SDSS images we classified these galaxies into barred or unbarred. With the purpose of providing an appropriate quantification of the effects of bars, we also constructed a suitable control sample of unbarred galaxies with similar redshift, magnitude, morphology, bulge sizes, and local environment distributions.We find that the bar fraction, with respect to the full sample of spiral face-on galaxies, is approx 22$\%$, in  good agreement with some previous works. Barred galaxies show an excess of old stellar populations (as derived with the $D_n(4000)$ spectral index), low star formation activity,  dominated by red $u-r$ and $g-r$ colors, with respect to the control sample. These results suggest that bars produce an important effect on galaxy properties.