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We study the efficiency of grain alignment by radiative torques (RATs) for anensemble of irregular grains. The grains are modeled as ensembles of oblate andprolate spheroids, deformed as Gaussian random ellipsoids, and their scatteringinteractions are solved using numerically exact methods. We define the fractionof the grains that both rotate fast and demonstrate perfect alignment withgrain long axes perpendicular to the magnetic field. We demonstrate that fortypical interstellar conditions the degree of alignment arising from the RATmechanism is significantly larger than that arising from the Davis-Greenstein(DG) mechanism based on paramagnetic relaxation. We quantify a factor relatedto the efficacy of alignment and show that it is related to a$q_\mathrm{max}$-factor of analytical model (AMO) of the RAT theory. Ourresults indicate that the RAT alignment can potentially be sufficiently strongand to explain observations even if grains do not have magnetic inclusions.

Alignment of irregular grains by radiative torques: efficiency study