Modelling the Galactic bar using OGLE-II Red Clump Giant Stars

Details Modelling the Galactic bar using OGLE-II Red Clump Giant Stars Modelling the Galactic bar using OGLE-II Red Clump Giant Stars

2007-04-12

arxiv.org/abs/0704.1614v1

Mon.Not.Roy.Astron.Soc.378:1064-1078,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 10 figures, accepted for publication in MNRAS. Supplementary material available online: 10 pages, 10 figures

Scientific paper

10.1111/j.1365-2966.2007.11843.x

Red clump giant stars can be used as distance indicators to trace the mass distribution of the Galactic bar. We use RCG stars from 44 bulge fields from the OGLE-II microlensing collaboration database to constrain analytic tri-axial models for the Galactic bar. We find the bar major axis is oriented at an angle of 24 - 27 degrees to the Sun-Galactic centre line-of-sight. The ratio of semi-major and semi-minor bar axis scale lengths in the Galactic plane x_0, y_0, and vertical bar scale length z_0, is x_0 : y_0 : z_0 = 10 : 3.5 : 2.6, suggesting a slightly more prolate bar structure than the working model of Gerhard (2002) which gives the scale length ratios as x_0 : y_0 : z_0 = 10 : 4 : 3 .

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