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Turbulence and Cloud Angular Momentum

Numerical models of molecular cloud cores are obtained, with assumed Gaussian random velocity fields that are consistent with moderate turbulence. If the velocity power spectrum is taken to be P( k) f'V k", with n == -4 or -3, then the constructed line-of-sight velocity maps on the plane of the sky show gradients that can be interpreted as rotation. Deduced values of angular velocity, angular momentum, and dimensionless rotational parameter {3 are consistent with observations. The velocity gradient n of an individual core is not a good indicator of its intrinsic angular momentum JIM. However, the distribution of deduced angular momenta from a large sample ofcores with different random velocity fields is close to the distribution of actual angular momenta of these model cores if one assumes JIM == pOR 2 where R is the core radius and p must be determined from a Monte-Carlo study. For centrally condensed cores the standard value of p == 0.4 overestimates the mean intrinsic angular momentum by a factor of 3.