084049

Recently comma very high energy TeV gamma-rays have been detected from the extended source W50-SS433 using the High-Altitude Water Cherenkov Observatory openParHAWCclosePar. Multi-wavelength observations suggest that the extended lobes of W50 are being impacted by the SS433 jets tens of parsecs away. X-ray emission is found to fill the radio lobe out to the radio .ears. comma softening away from the black hole and with evidence of hard X-rays in the innermost regions pointing to an extreme accelerator. We propose a joint XMM-NuSTAR observation of the HAWC emission comma coincident with the inner eastern lobe of W50. This broadband X-ray study will comma for the first time comma resolve and constrain both the non-thermal and thermal X-ray emission comma providing a key insight into the nature of this Galactic PeVatron.