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26 April 2024 |
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The long bar as seen by the VVV Survey: II. Star counts | | Eduardo Brescansin de Amôres
; Martín López-Corredoira
; Carlos González-Fernández
; André Moitinho
; Dante Minniti
; Sebastian Gurovich
; | | Date: |
28 Aug 2013 | | Abstract: | There is still some debate about the presence and the morphological
properties of the long bar that is still is an undisputed structure in the
inner Galaxy. We investigate the morphological properties of the long Galactic
bar using the VVV survey extending star counts at least 3 mag deeper than
2MASS. Our study covers the relatively unexplored negative longitudes of the
Galactic bar. We obtain a detailed description of the spatial distribution of
star counts towards the long Galactic bar as well as to measure its parameters.
We performed star counts towards -20^circ < ell < 0, |b| leq 2^circ$ using
VVV, 2MASS, and GLIMPSE data. We applied an average interstellar extinction
correction. We also adjusted latitudinal profiles to obtain the centroid
variation and bar thickness. We probe, the structure of long Galactic bar, as
well as its far edge at ell approx -14^circ. The differences between counts
with and without extinction correction allow us to produce a crude extinction
map showing regions with high extinction, mainly beyond the end of long
Galactic bar. The latitudinal profiles show evidence of the centroid vertical
variation with Galactic longitude reaching a minimum at ell approx
-13.8^circ. The bar has an inclination angle alpha =43^circ pm 5^circ with
respect to the line Sun-Galactic center. In addition, we have determined the
bar parameters, such as thickness, length, and stellar distribution. | | Source: | arXiv, 1308.6022 | | Services: | Forum | Review | PDF | Favorites | |
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