Triaxial bulge, thin disc and bar of the Milky Way

Details Triaxial bulge, thin disc and bar of the Milky Way Triaxial bulge, thin disc and bar of the Milky Way

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..317..142p&link_type=abstract

Milky Way Surveys: The Structure and Evolution of our Galaxy, Proceedings of ASP Conference #317. The 5th Boston University Ast

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present here two studies of the inner Milky Way using both the Besançon model of the Galaxy and near infrared star counts. Firstly, we have fitted the density parameters of the triaxial outer bulge and the inner old thin disc with DENIS data at |ℓ|<12° and |b|<4°, and show that the bulge is very oblate, with an angle from the sun-Galactic center direction of ≈10°. Secondly, we have compared Besançon simulations with CAIN data at 15°<ℓ<45° |b|≤ 2°, and show the existence of an in-plane extra density of stars at l≤27°, with a distance from the sun at ≈6 kpc. This extended over-density might correspond to the top end of a bar having a half-length of about 4 kpc and an angle of 45°±9°.

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