The Milky Way: A Significant Asymmetric Distribution of Faint Halo/Thick Disk Stars

Astronomy and Astrophysics – Astronomy

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Scientific paper

We present a star count analysis of the faint stars on either side of the Sun-Center line, from l = +/- 20 deg to +/- 75 deg and b = +20 deg to +50 deg with data from 40 POSS I fields. Larsen and Humphreys [1996] found a significant asymmetry in the number of faint blue stars on either side of the line to the Galactic center with significantly more stars observed in the first quadrant. We sample stars of different color ranges to distinguish between halo/thick disk and old disk stellar populations using a galactic model. Our analysis shows that the observed stellar excess increases with fainter magnitudes and is comprised of mainly halo/thick disk stars. It is possible the excess in star counts could be due to a bar-induced ''wake'', a disk interaction from a merger or that the asymmetry is an indication that the thick disk/inner halo is triaxial. A ''wake'' would suggest that the asymmetry is also present below the plane, so we are investigating 40 additional fields below the galactic plane.

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