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Three-dimensional decomposition of galaxies with bulge and long bar

Bibcode
2014A&A...571A..98C
DOI
10.1051/0004-6361/201424572
Compère, P.; López-Corredoira, M.; Garzón, F.
Bibliographical reference

Astronomy and Astrophysics, Volume 571, id.A98, 8 pp.

Advertised on:
11
2014
Journal
Astronomy and Astrophysics
Number of authors
3
IAC number of authors
3
Citations
7
Refereed citations
6
Description
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°.
Related projects
Project Image
Morphology and dynamics of the Milky Way

This project consists of two parts, each differentiated but both complementary: morphology and dynamics. Detailed study of the morphology of the Milky Way pretends to provide a data base for the stellar distribution in the most remote and heavily obscured regions of our Galaxy, through the development of semiempirical models based on the

Martín
López Corredoira
In progress
Type
Refereed
Galaxies
The Milky Way and the Local Group (MWLG)

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