The OMC - 1 molecular hydrogen out owas a fragmented stellar wind bubbleMark

We present new images of the OMC-1 molecular hydrogen outtow, made using long-slit spectroscopy in order to accurately subtract the underlying continuum emission. These images reveal an extremely clumpy, quasi-spherical inner shell that breaks up at larger radii into bow-shocks and trailing wakes in the northwest , as originally described by Allen & Burton (1993); a fainter counter-nger to the southeast is newly discovered in the present data. While the outtow appears to be broadly bipolar, this is probably due to an interaction between an initially spherical wind from the source and a large-scale density enhancement surrounding it, rather than direct collimation imposed close to the source. The clumpy appearance of the inner shell connrms the prediction of the recent model of Stone, Xu, & Mundy (1995), in which a spherical and time-varying wind fragments a swept-up shell, producing high-velocity shrapnel, which in turn drives bow-shocks into the surrounding gas, resulting in the observed \\ngers". As an alternative to the single varying source proposed by Stone et al., we speculate that several young sources in the BN-KL cluster may have been responsible for rst sweeping up the shell and then fragmenting it.