Multi-wavelength Emission from Galactic Jets: the Case of the
  Microquasar SS433
  SS433 is a Galactic microquasar with powerful jets, where very-high-energy
particles are produced. We study particle acceleration in the jets of SS433 in
the light of the recent multi-wavelength data from radio to TeV gamma ray. We
first present a general framework for the particle acceleration, cooling, and
transport in relativistic jets. We then apply this to two X-ray knots in the
jets of SS433, focusing on leptonic emission. Our detailed treatment of
particle transport and evolution produces substantially different predictions
from previous papers. For both regions, our model can account for the
multi-wavelength data except for the GeV data. This suggests that GeV emission
is mostly from different regions and/or mechanisms. We find that the
acceleration process should be efficient, which could be realized by diffusive
shock acceleration close to the Bohm limit. Provided that protons are
accelerated at the same efficiency as electrons, our results imply that SS433
is a PeVatron, i.e., can accelerate protons beyond a PeV. Future hard X-ray and
MeV gamma-ray observations can critically test our models by detecting the
spectral turnover or cutoff.
