A HEAD-TAIL-STRUCTURED MOLECULAR CLOUD AND A CO OUTFLOW ASSOCIATED WITH IRAS 22103+5828 IN S134

We have carried out (CO)-C-12, (CO)-C-13, and (CO)-O-18 (J = 1-0) obse rvations toward IRAS 22103 + 5828 in the H Pi region S134 with the 4 m telescope at Nagoya University and the 45 m telescope at Nobeyama Rad io Observatory. We find a molecular cloud and a dense core around the IRAS point source. The molecular cloud is elongated, consisting of a d ense ''head'' and a diffuse extended ''tail,'' with the head pointing toward the star exciting the H Pi region, lambda Cep. The cloud shows a velocity gradient of similar to 0.2 km s(-1) pc(-1) along the major axis. A molecular outflow has been discovered at the position of the I RAS point source. The combination of (1) the head-tail structure and t he velocity gradient of the molecular cloud, (2) the presence of the d ense core and the molecular outflow, and (3) the high ratio of the IRA S luminosity to the cloud mass strongly implies that IRAS 22103+5828 f ormed in the cloud associated with S134. The possibility is suggested that the rocket effect may be the major mechanism causing the observed velocity gradient of the quiescent molecular cloud.