tokens: ACKNOWLEDGEMENTS We acknowledge the ‘Accordo Quadro INAF-CINECA (2017)' for the availability of high performance computing resources and support. Simulations have been performed as part of the class-A project ‘Three-dimensional relativistic simulations of bow shock nebulae' (PI B. Olmi). The authors also acknowledge financial support from the PRIN-MIUR project prot. 2015L5EE2Y ‘Multi-scale simulations of high-energy astrophysical plasmas'. B. Olmi wishes also to acknowledge Andrea Mignone, from the PLUTO team, for fundamental support, and Simone Landi and Luca Del Zanna for fruitful discussions.
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