Measurement of Harmonic Flow from Heavy Ion Collisions in ATLAS

This talk will present the results of the azimuthal anisotropy of charged particle production in Pb+Pb collisions measured with the ATLAS experiment. The results are obtained by inter-comparing several different methods with the event plane method as a baseline. A complete set of v_n harmonics measured from central to peripheral events cover a pseudo-rapidity range of $|eta|<$2.5 and a transverse momentum range 0.5 $<p_T<$ 20 GeV. Non-flow effects as well as the size of flow fluctuations are currently being assessed by inter-comparing different approaches. Scaling of integrated elliptic flow, down to very low-pT, will be discussed and compared to results of lower energy experiments.