Disks, Microjets, Windblown Bubbles, and Outflows in the Orion Nebula*

摘要: New deep narrowband images of the Orion Nebula obtained with WFPC2 on Hubble Space Telescope (HST) and spectra taken HIRES spectrometer at Keck Observatory are presented. We report eight new circumstellar disks seen in silhouette against background nebular light about 30 dark embedded within bright proplyds rimmed by ionization fronts. Deep λ6300 A reveal skins glowing [O I] emission associated several proplyds. also surrounds one disk not surrounded an front; this object may be photon-dominated, mostly neutral region behind front Nebula. The intensity morphology provides support for photon-dominated–region models externally irradiated which soft UV powers photoablation surface. Dozens outflows powered young stars have been discovered images. More than 20 stellar jets emerge from or their Most one-sided (monopolar) subarcsecond-scale microjets, too small to ground-based light. Additionally, wide-angle winds 10 outskirts power large-scale bow shocks facing Trapezium OB stars. These produced wind-wind interactions where T-Tauri interact outflow plasma core M42. largest such structure, star LL Ori, contains a number compact high–proper-motion clumps moving almost tangentially shock. data combined older HST determine proper motions many features. Neither Ori type nebula nor Hα + III] arcs that surround near show measurable therefore stationary structures. However, most other bow-shaped features centered exhibit large motions, velocities ranging 50 300 km s-1. sources these remain unknown. proper-motion survey reveals presence dozen (>0.1 pc) complexes. Many originate vicinity high-luminosity OMC-1S infrared submillimeter source complex located southwest Trapezium. supersonic provide evidence inject amounts kinetic energy into nebula. quantitative analysis indicates total is compared flowing away main front.