  There are three Galactic jet sources, from which TeV emission has been
detected: LS 5039, LS I +61 303 and Cygnus X-1. These three sources show
power-law tails at X-rays and soft gamma-rays that could indicate a non-thermal
origin for this radiation. In addition, all three sources apparently show
correlated and complex behavior at X-ray and TeV energies. In some cases, this
complex behavior is related to the orbital motion (e.g. LS 5039, LS I +61 303),
and in some others it is related to some transient event occurring in the
system (e.g. Cygnus X-1, and likely also LS I +61 303 and LS 5039). Based on
modeling or energetic grounds, it seems difficult to explain the emission in
the X-/soft gamma-ray and the TeV bands as coming from the same region (i.e.
one-zone). We also point out the importance of the pair creation phenomena in
these systems, which harbor a massive and hot star, for the radio and the X-ray
emission, since a secondary pair radiation component may be significant in
these energy ranges. Finally, we discuss that in fact the presence of the star
can indeed have strong impact on, beside the non-thermal radiation production,
the jet dynamics.
