Association of cyanodiacetylene emission in Heiles 2 with a cloud collision?

Abstract

A map of the |$J=9\rightarrow8$| transition of cyanodiacetylene emission in Heiles 2 dust cloud shows the source to be highly extended with dimensions 16 by ∼ 2 × 1017 cm. Although it may have stopped collapsing along its width, it appears to be unstable to contraction along its length. The position, elongation, and LSR velocity of the source suggest that it may result from a cloud collision between the two halves of Heiles 2.