Breaking Orion's Veil with fossil outflows

The role of feedback in the self-regulation star formation is a fundamental question astrophysics. Orion Nebula nearest site ongoing and recent massive formation. It unique laboratory for study stellar feedback. Recent SOFIA [CII] 158 $\mu$m observations revealed an expanding bubble, Veil shell, being powered by winds ionization We have identified protrusion-like substructure Northwest portion Shell that may indicate additional mechanisms are highly directional. Our goal to investigate origin protrusion quantifying its possible driving mechanisms. use map obtained with upGREAT instrument onboard SOFIA. spectral spatial resolution 0.3 km/s 16 arcsec, respectively. consider three origins this protrusion: Fossil outflow cavities created jets/outflows during protostellar accretion phase, pre-existing clumpiness OMC-1 core, wind main sequence phase. Based on energetics morphology, we conclude northwestern part cloud was locally perturbed outflows ejected from protostars Trapezium cluster. This suggests result mechanical rather than radiative Furthermore, argue location suitable place break owing photo-ablation walls protrusion. can influence morphology future \hii\,region even cause breakages front. Specifically, interaction main-sequence stars molecular core pre-processed jet important.