A search for possible interactions between ejections from GRS 1915+105 andthe surrounding interstellar medium

We have observed an extended region surrounding the first discovered galact ic superluminal source GRS 1915+105, seeking evidence of interaction betwee n the relativistic ejecta of that object and the interstellar medium. We fi nd two radio sources axisymmetrically aligned along the sub-arcsecond relat ivistic ejecta of GRS 1915+105 and roughly 17' distant from it, which coinc ide with the luminous IRAS sources 19124+1106 and 19132+1035. We have obser ved these sources at centimeter (VLA), millimeter (IRAM 30 m), and infrared (ISO, UKIRT, ESO/MPI 2.2 m) wavelengths in both line and continuum emissio n. At centimeter wavelengths a non-thermal jet-like feature aligned along t he outflow axis is located adjacent to the inner edge of the southern sourc e. Strong density enhancements are found in the millimeter tracers CO and ( HCO+)-C-13 at the positions of both sources and some of the morphology is r eminiscent of shock-like interactions; however, linewidths are narrow. At i nfrared wavelengths strong hydrogen recombination lines and weak lines of m olecular hydrogen are observed at the southern source. We discuss these res ults as possible evidence of the sought-after interaction, both in terms of the regions undergoing ongoing shock-heating and in terms of them being lo cations of shock-induced star formation. The evidence for each of these is inconclusive. Millimeter line mapping of a portion of W 50 where the relati vist;ic jets of the X-ray binary SS 433 interact with the interstellar medi um shows roughly similar morphology as GRS 1915+105, suggesting that the ph enomena observed at the IRAS sources may not be unusual for such a long dis tance interaction.