We study the density profile and shape of the Galactic halo using deep multicolour images from the MENeaCS and CCCP projects , over 33 fields selected to avoid overlap with the Galactic plane .
Using multicolour selection and PSF homogenization techniques we obtain catalogues of F stars ( near-main sequence turnoff stars ) out to Galactocentric distances up to 60kpc .
Grouping nearby lines of sight , we construct the stellar density profiles through the halo in eight different directions by means of photometric parallaxes .
Smooth halo models are then fitted to these profiles .
We find clear evidence for a steepening of the density profile power law index around R = 20 kpc , from -2.50 \pm 0.04 to -4.85 \pm 0.04 , and for a flattening of the halo towards the poles with best-fit axis ratio 0.63 \pm 0.02 .
Furthermore , we can not rule out a mild triaxiality ( w \geq 0.8 ) .
We recover the signatures of well-known substructure and streams that intersect our lines of sight .
These results are consistent with those derived from wider but shallower surveys , and augur well for upcoming , wide-field surveys of comparable depth to our pencil beam surveys .