SIMBAD references

2000MNRAS.317L..45H - Mon. Not. R. Astron. Soc., 317, L45-L49 (2000/September-3)

Detection of the old stellar component of the major Galactic bar.


Abstract (from CDS):

We present near-infrared colour-magnitude diagrams and star counts for a number of regions along the Galactic plane. It is shown that along the l=27°, b=0° line of sight there is a feature at 5.7±0.7kpc with a density of stars at least a factor of 2 and probably more than a factor of 5 times that of the disc at the same position. This feature forms a distinct clump on an H versus J-H diagram and is seen at all longitudes from the bulge to about l=28°, but at no longitude greater than this. The distance to the feature at l=20° is about 0.5kpc further than at l=27°, and by l=10° it has merged with, or has become, the bulge. Given that at l=27° and l=21° there is also a clustering of very young stars, the only component that can reasonably explain what is seen is a bar with half-length of around 4kpc and a position angle of about 43°±7°.

Abstract Copyright: 2000, Royal Astronomical Society

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

Simbad objects: 2

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