Internal Velocities in the Orion Nebula: Large Radial Velocity Features

Details Internal Velocities in the Orion Nebula: Large Radial Velocity Features Internal Velocities in the Orion Nebula: Large Radial Velocity Features

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.3456d&link_type=abstract

The Astronomical Journal, Volume 127, Issue 6, pp. 3456-3478.

Astronomy and Astrophysics

Astronomy

23

Ism: Herbig-Haro Objects, Ism: Individual: Name: Orion Nebula, Ism: Jets And Outflows, Stars: Winds, Outflows

Scientific paper

A map of high-velocity features in the 3'×5' central region of the Orion Nebula was created from slit spectra with a velocity resolution of 8 km s-1. We identified two new bipolar flows, Herbig-Haro (HH) 725 and HH 726, as well as a highly redshifted flow, HH 512. We also found multiple new high-velocity co-moving features, all lying in the velocity range of -30 to -100 km s-1. The newly discovered Big Arc appears as a slightly blueshifted feature. Unlike the other objects found, the Big Arc is not a shock; rather it is a result of a structural alteration in the nebula nearly extended across the sampled region. Spatial velocities of 19 features belonging to 11 HH objects were obtained by combining these radial velocity data with existing proper motion data. Most HH objects in the H II region exhibit spatial velocities ranging from 50 to 150 km s-1. By analyzing their three-dimensional paths, HH 202 and HH 203 + 204 were found to be formed on the curved main ionization front, not on the Veil, as previously proposed. We have been able to locate the source of the HH 201 outflow (possibly the IRc2 feature within the BN/KL region) at 0.21 pc behind the ionization front of the nebula. This is in contrast to the Optical Outflow Source, which gives rise to most of the HH objects in the Orion Nebula and lies only a few hundredths of a parsec behind the ionization front of the nebula.
Based in part on observations obtained at the Kitt Peak National Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation and based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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