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Published online by Cambridge University Press: 19 July 2016
Different astrophysicai contexts (e.g. extragalactic jets, star forming regions) are related with collimated ouflows. An analysis of this phenomenology in principle would require a fully numerical treatment, however analytical investigations are also possible by assuming a suitable behaviour of streamlines. In this framework we investigate solutions of the hydrodynamic and MHD equations describing helicoidal collimated outflows from a central gravitating object.