Query : 2008A&A...491..781C

2008A&A...491..781C - Astronomy and Astrophysics, volume 491, 781-787 (2008/12-1)

The long Galactic bar as seen by UKIDSS Galactic plane survey.


Abstract (from CDS):

Over the past decade there have been a series of results supporting the hypothesis of the existence of a long thin bar in the Milky Way with a half-length of 4.5kpc and a position angle of around 45°. This is apparently a very different structure from the triaxial bulge of the Galaxy, which is thicker and shorter and dominates the star counts at |l|<10°. In this paper, we analyse the stellar distribution in the inner Galaxy to see if there is clear evidence for two triaxial or bar-like structures in the Milky Way. By using the red-clump population as a tracer of Galactic structure, we determine the apparent morphology of the inner Galaxy. Deeper and higher spatial-resolution near infrared photometry from the UKIDSS Galactic plane survey allows us to use in-plane data even at the innermost Galactic longitudes, a region where the source confusion is a dominant effect that makes it impossible to use other databases, such as 2MASS or TCS-CAIN. We show that results previously obtained with the red-clump giants are confirmed with the in-plane data from UKIDSS GPS. There are two different structures coexisting in the inner Galactic plane: one with a position angle of 23.60±2.19deg that can be traced from the Galactic centre up to ∼10° (the Galactic bulge), and other with a larger position angle of 42.44±2.14deg, that ends around l=28° (the long Galactic bar).

Abstract Copyright:

Journal keyword(s): Galaxy: general - Galaxy: stellar content - Galaxy: structure - infrared: stars

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13564 0
2 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2631 0
3 NAME Galactic Bar reg ~ ~           ~ 1128 0
4 NAME Galactic Bulge reg ~ ~           ~ 4052 0

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