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We propose to use ISOCAM and ISOPHOT to study phenomena at the
interface between the High Energy Astrophysics and the Physics of
Cold Interstellar Gas. If an X-ray binary is inside or near a molecular
cloud most of the energy from the relativistic particles streaming out
from the compact source must be dissipated by heating of the interstellar
material and thermal emission from dust is expected. The radio ears in W50
(which are brightened by particles streaming out from the classic microquasar
SS433), and the runaway binary Circinus X-1 (which is moving through the
interstellar medium at a speed of several hundred km/s) are appropriate
to study these phenomena. Other sources of study are the high mass X-ray
binary Cygnus X-1 and the superluminal microquasar.