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The formation mechanism of the W50/SS433 complex has long been a mystery. Wepropose a new scenario in which the SS433 jets themselves form the W50/SS433system. We carry out magnetohydrodynamics simulations of two-side jetpropagation using the public code CANS+. As found in previous jet studies, whenthe propagating jet is lighter than the surrounding medium, the shocked plasmaflows back from the jet tip to the core. We find that the morphology of lightjets is spheroidal at early times, and afterward, the shell and wings aredeveloped by the broadening spherical cocoon. The morphology strongly dependson the density ratio of the injected jet to the surrounding medium. Meanwhile,the ratio of the lengths of the two-side jets depends only on the densityprofile of the surrounding medium. We also find that most of the jet kineticenergy is dissipated at the oblique shock formed by the interaction between thebackflow and beam flow, rather than at the jet terminal shock. The position ofthe oblique shock is spatially consistent with the X-ray and TeV gamma-rayhotspots of W50.

Continuous Jets and Backflow Models for the Formation of W50/SS433 in Magnetohydrodynamics Simulations