  Measurements of flow harmonics $v_1-v_6$ are presented in a broad range of
transverse momentum and centrality for $\sqrt{s_{NN}} = 2.76$ TeV Pb-Pb
collisions with the ATLAS experiment. The fourier coefficients of two-particle
correlations are shown to factorize as products of the single particle $v_n$
for $n=2-6$. The factorization breaks for $n=1$ due to effects of global
momentum conservation. The dipolar $v_1$ associated with the initial dipole
asymmetry is extracted from the two-particle correlations via a two component
fit that accounts for momentum conservation. The magnitude of the extracted
dioplar $v_1$ is comparable to $v_3$. Measurements of correlations between
harmonic planes of different orders, which give additional constraints on the
initial geometry and expansion mechanism of the medium produced in the heavy
ion collisions, are also presented.
