Kinematic analysis of the ambient molecular clouds. Left panel: integrated intensity images for clouds: MC G150.6+03.7, MC G149.5+04.9, MC G151.9+05.2, and MC 150.9+05.1. Right panels: l-v (top) and b-v (bottom) diagrams show the ¹²CO data integrated over the selected clouds. An approximate fitting is marked by a red solid-line ellipse, illustrating an arc-like structure in the diagrams.