Galaxy Zoo: secular evolution of barred galaxies from structural decomposition of multiband images

Kruk, Sandor J.
Lintott, Chris J.
Bamford, Steven P.
Masters, Karen L.
Simmons, Brooke D.
Häußler, Boris
Cardamone, Carolin N.
Hart, Ross E.
Kelvin, Lee
Schawinski, Kevin
Smethurst, Rebecca J.
Vika, Marina

Open link

Publication date

March 2018

DOI

10.1093/mnras/stx2605

Publisher

Oxford University Press (OUP)

Abstract

We present the results of two-component (disc+bar) and three-component (disc+bar+bulge) multiwavelength 2D photometric decompositions of barred galaxies in five Sloan Digital Sky Survey (SDSS) bands (ugriz). This sample of ∼3500 nearby (z<0.06) galaxies with strong bars selected from the Galaxy Zoo citizen science project is the largest sample of barred galaxies to be studied using photometric decompositions that include a bar component. With detailed structural analysis, we obtain physical quantities such as the bar- and bulge-to-total luminosity ratios, effective radii, Sersic indices and colours of the individual components. We observe a clear difference in the colours of the components, the discs being bluer than the bars and bulges. An...