Three-dimensional decomposition of galaxies with bulge and long bar

Abstract

Some observations indicate that the Milky Way has two inner components, a bulge and a long bar, which present a misalignment of about 20 degrees that is against the predictions of some theoretical models that are based on numerical simulations. In this paper, we wish to determine whether this misalignment between the bar and the bulge can be observed in barred galaxies other than the Milky Way. For that, 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 chi-square goodness-of-fit estimation allowed retrieving the best-fit angle values for the bar and the bulge to detect any misalignment. 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 more than 20 degrees.

arXiv comment8 pages, 1 figure. Accepted for publication in A&A. Corrected typos

References in corpus (35)

• Detailed Structural Decomposition of Galaxy Images
• Detailed Decomposition of Galaxy Images. II. Beyond Axisymmetric Models
• Structural Properties of Pseudo-Bulges, Classical Bulges and Elliptical Galaxies: an SDSS Perspective
• Dynamics of Barred Galaxies
• First GLIMPSE Results on the Stellar Structure of the Galaxy
• Mapping the Three-Dimensional Density of the Galactic Bulge with VVV Red Clump Stars
• Old stellar Galactic disc in near-plane regions according to 2MASS: scales, cut-off, flare and warp
• Modelling the Galactic Bar Using Red Clump Giants
• AINUR: Atlas of Images of NUclear Rings
• BUDDA: A New Two-Dimensional Bulge/Disk Decomposition Code for Detailed Structural Analysis of Galaxies
• Image Decomposition of Barred Galaxies and AGN Hosts
• Modelling the Galactic bar using OGLE-II Red Clump Giant Stars
• Detection of the old stellar component of the major Galactic bar
• K-Band Observations of Boxy Bulges. I. Morphology and Surface Brightness Profiles
• A New Photometric Model of the Galactic Bar using Red Clump Giants
• Unifying boxy bulge and planar long bar in the Milky Way
• Peanuts at an Angle: Detecting and Measuring the Three-Dimensional Structure of Bars in Moderately Inclined Galaxies
• The Long Bar in the Milky Way. Corroboration of an old hypothesis
• The Near-infrared S0 Survey III: Morphology of 15 Southern Early-type Disk Galaxies
• The long Galactic bar as seen by UKIDSS Galactic Plane Survey
• A boxy bulge in the Milky Way. Inversion of the stellar statistics equation with 2MASS data
• Mid-Infrared Galaxy Morphology from the Spitzer Survey of Stellar Structure in Galaxies (S^4G): The Imprint of the de Vaucouleurs Revised Hubble-Sandage Classification System at 3.6 microns
• Kinematic Signatures of Bulges Correlate with Bulge Morphologies and Sérsic Index
• Disk-Bulge-Halo Models for the Andromeda Galaxy
• Searching for the in-plane Galactic bar and ring in DENIS
• Unveiling the Structure of Barred Galaxies at 3.6 $\mu \mathrm{m}$ with the Spitzer Survey of Stellar Structure in Galaxies (S${}^4$G): I. Disk Breaks
• Modelling the inner disc of the Milky Way with manifolds. I - A first step
• Evidence for a deficit of young and old stars in the Milky Way inner in-plane disc
• Stellar density distribution in the NIR on the Galactic plane at longitudes 15-27 deg. Clues for the Galactic bar ?
• Modeling Star counts in the Monoceros stream and the Galactic anti-centre
• The long bar as seen by the VVV Survey: II. Star counts
• NIR surface photometry of a sample of nearby spiral galaxies
• Investigation of the Galactic Bar based on Photometry and Stellar Proper Motions
• Towards understanding the dynamics of the bar/bulge region in our Galaxy
• Dynamical evolution of two associated galactic bars

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