Asymmetric SN explosion in Vela SNR

The Vela supernova remnant (SNR) displays remarkable features which appear to beejecta shrapnel.. visible beyond the main shell. One of these shrapnel (A) isdistinct from the others in that its Xray spectrum exhibits a high Siabundance, while the other shrapnel exhibit enhanced O, Ne, and Mg abundances.Two unexplored ejecta shrapnel (G and H) are located on the opposite side of theremnant from shrapnel A, suggesting that the SN explosion may have resulted in ajetcounterjet Sirich structure, reminiscent of Cas A. We propose to observethese shrapnel for the first time to determine if they are also Sirich likeshrapnel A. If this is the case, the Vela SNR may be the first direct evidenceof a jetinduced SN explosion. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]