We report on preliminary results from a new deep 21-cm survey of the Andromeda galaxy , based on observations performed with the Synthesis Telescope and the 26-m antenna at DRAO .
The H i distribution and kinematics of the disc are analyzed and basic dynamical properties are derived .
New H i structures are discovered , like thin H i spur-like structures and an external arm in the disc outskirts .
The H i spurs are related to perturbed stellar clumps outside the main disc of M31 .
The external arm lies on the far , receding side of the galaxy and has no obvious counterpart in the opposite side .
These H i perturbations probably result from tidal interactions with companions .
It is found a dynamical mass of ( 4.7 \pm 0.5 ) \times 10 ^ { 11 } M _ { \odot } enclosed within a radius R = 38 kpc and a total mass of \sim 1 \times 10 ^ { 12 } M _ { \odot } inside the virial radius .