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ON THE LENGTHS, COLORS, AND AGES OF 18 FACE-ON BARS D. A. Gadotti1, 2, 3
 

Summary: ON THE LENGTHS, COLORS, AND AGES OF 18 FACE-ON BARS
D. A. Gadotti1, 2, 3
and R. E. de Souza1
Received 2004 October 1; accepted 2005 November 22
ABSTRACT
Along with a brief analysis we present data obtained from BVRI and Ks images of a sample of 19 galaxies (18 barred
and 1 unbarred), which will be further explored in a future paper. We measured the lengths and colors of the bars,
created color maps, and estimated global color gradients. Applying a method developed in a companion paper, we
could distinguish for seven galaxies in our sample those whose bars have been recently formed from the ones with
already evolved bars. We estimated an average difference in the optical colors between young and evolved bars that
may be translated to an age difference of the order of 10 Gyr, meaning that bars may be, at least in some cases, long-
standing structures. Moreover, our results show that, on average, evolved bars are longer than young bars. This seems
to indicate that, during its evolution, a bar grows longer by capturing stars from the disk, in agreement with recent
numerical and analytical results. Although the statistical significance of these results is low, and further studies are
needed to confirm them, we discuss the implications from our results on the possibility of bars being a recurrent
phenomenon. We also present isophotal contours for all our images as well as radial profiles of relevant photometric
and geometric parameters.
Subject headinggs: galaxies: bulges -- galaxies: evolution -- galaxies: formation --
galaxies: fundamental parameters -- galaxies: photometry -- galaxies: structure
Online material: extended figure set

  

Source: Alexei, Dimitri - European Southern Observatory

 

Collections: Physics