Discovery of new objects in the Orion nebula on HST images - Shocks, compact sources, and protoplanetary disks

Details Discovery of new objects in the Orion nebula on HST images - Shocks, compact sources, and protoplanetary disks Discovery of new objects in the Orion nebula on HST images - Shocks, compact sources, and protoplanetary disks

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410..696o&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 410, no. 2, p. 696-700.

Astronomy and Astrophysics

Astronomy

235

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

Scientific paper

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.

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