Weak Elliptical Distortion of the Milky Way Potential traced by Open Clusters

Details Weak Elliptical Distortion of the Milky Way Potential traced by Open Clusters Weak Elliptical Distortion of the Milky Way Potential traced by Open Clusters

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008chjaa...8...96z&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 8, Issue 1, pp. 96-102 (2008).

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

From photometric observations and star counts, the existence of a bar in the central few kpc of the Galaxy is suggested. It is generally thought that our Galaxy is surrounded by a massive invisible halo. The gravitational potential of the Galaxy is therefore made non-axisymmetric generated by the central triaxial bar, by the outer triaxial halo, and/or by the spiral structures. Selecting nearly 300 open clusters with complete spatial velocity measurements and ages, we were able to construct the rotation curve of the Milky Way within a range of 3 kpc of the Sun. Using a dynamic model for an assumed elliptical disk, a clear weak elliptical potential of the disk with ellipticity of epsilon(R0) = 0.060±0.012 is detected, the Sun is found to be near the minor axis, displaced by 30°±3°. The motion of the clusters is suggested to be on an oval orbit rather than on a circular one.

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