Discovery of New Objects in the Orion Nebula on HST Images: Shocks, Compact Sources, and Protoplanetary Disks
Abstract
We have reduced and analyzed a set of narrow-band HST images of a portion of M42 south of the Trapezium. Many new emission-line sources were found, some quite long but so narrow that they are not seen on ground-based images. These include thin shells which are high-ionization shocks. The structure around Orion HH 3 is resolved into multiple components. Slit spectroscopy data establish the high expansion velocities of all these regions. The other objects seen are compact sources. Although some had been detected in VLA surveys and several had been seen from the ground optically, the new images show previously undetected structure and clearly establish that most are protoplanetary disks, which are neutral disks surrounding low-mass pre-main-sequence stars and are ionized from the outside by Theta1 C and Theta2 A Ori.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1993
- DOI:
- 10.1086/172786
- Bibcode:
- 1993ApJ...410..696O
- Keywords:
-
- Herbig-Haro Objects;
- Hubble Space Telescope;
- Orion Nebula;
- Pre-Main Sequence Stars;
- Protoplanets;
- Spaceborne Astronomy;
- Astronomical Models;
- Charge Coupled Devices;
- Ionization;
- Molecular Clouds;
- Shock Waves;
- Astrophysics;
- ISM: H II REGIONS;
- ISM: INDIVIDUAL NAME: ORION NEBULA;
- ISM: JETS AND OUTFLOWS;
- STARS: FORMATION