Volume 571, November 2014
|Number of page(s)||8|
|Published online||17 November 2014|
Three-dimensional decomposition of galaxies with bulge and long bar
Instituto de Astrofísica de Canarias,
La Laguna, Tenerife
2 Universidad de La Laguna, Dpto. Astrofísica, 38206, La Laguna, Tenerife, Spain
Received: 9 July 2014
Accepted: 13 October 2014
Context. Some observations indicate that the Milky Way has two inner components, a bulge and a long bar, which present a misalignment of Δα ≃ 20° that is against the predictions of some theoretical models that are based on numerical simulations.
Aims. We wish to determine whether this misalignment between the bar and the bulge can be observed in barred galaxies other than the Milky Way.
Methods. Each galaxy of our sample was decomposed based on its Ks-band 2MASS image by fitting and modelling in a three-dimensional (3D) space the following components: a disc, a bar, and a bulge. The χ2 goodness-of-fit estimation allowed retrieving the best-fit angle values for the bar and the bulge to detect any misalignment.
Results. From the 3D decomposition of six barred galaxies, we have detected at least three galaxies (NGC 2217, NGC 3992, and NGC 4593) that present a significant misalignment between the bar and the bulge of Δα> 20°.
Key words: galaxies: structure / galaxies: bulges / galaxies: fundamental parameters / Galaxy: structure
© ESO, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.