Detection of the old stellar component of the major Galactic bar

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

2000-07-17

arxiv.org/abs/astro-ph/0007232v1

Mon.Not.Roy.Astron.Soc. 317 (2000) L45

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures accepted as a letter in MNRAS

Scientific paper

10.1046/j.1365-8711.2000.03858.x

We present near-IR 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 two and probably more than a factor five times that of the disc at the same position. This feature forms a distinct clump on an H vs. 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.

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