Galactic superluminal sources

A new class of X-ray sources was clearly established with the discovery of highly relativistic radio jets from the galactic sources GRS 1915 + 105 and GRO J1655-40. Both of these objects have given us a broader view of black holes and the formation of jets, yet they also show the complexity of the a ccretion environment near relativistic objects. The fast apparent motion of the jets, their luminosity and variability, high energy spectrum, and appr oximate scaling to the behavior of active galactic nuclei, certainly warran t the description "microquasar". I present a review of the observational da ta on these sources, and discuss where we stand on a physical picture of GR S 1915 + 105 and GRO J1655-40 as taken from multi-wavelength studies. I als o point out other galactic sources which share some of the properties of th e microquasars, and what to look for as a high energy "signature" in future observations.