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Many supernova remnants (SNRs) are characterized by a knotty ejectastructure. The Vela SNR is an excellent example of remnant in which detachedclumps of ejecta are visible as X-ray emitting bullets that have been observedand studied in great detail. We aim at modelling the evolution of ejectashrapnel in the Vela SNR, investigating the role of their initial parameters(position and density) and addressing the effects of thermal conduction andradiative losses. We performed a set of 2-D hydrodynamic simulations describingthe evolution of a density inhomogeneity in the ejecta profile. We exploreddifferent initial setups. We found that the final position of the shrapnel isvery sensitive to its initial position within the ejecta, while the dependenceon the initial density contrast is weaker. Our model also shows that moderatelyoverdense knots can reproduce the detached features observed in the Vela SNR.Efficient thermal conduction produces detectable effects by determining anefficient mixing of the ejecta knot with the surrounding medium and shaping acharacteristic elongated morphology in the clump.

Hydrodynamic modelling of ejecta shrapnel in the Vela supernova remnant