High Velocity Features in the Orion Nebula

Abstract

We have used widely spaced in time Hubble Space Telescope images to determine tangential velocities of features associated with outflows from young stars. These observations were supplemented by groundbased telescope spectroscopy and from the resultant radial velocities, space velocities were determined for many outflows. Numerous new moving features were found and grouped into known and newly assigned Herbig Haro objects. It was found that stellar outflow is highly discontinuous, as frequently is the case, with long-term gaps of a few hundred years and that these outflow periods are marked by staccato bursts over periods of about ten years. Although this has been observed in other regions, the Orion Nebula Cluster presents the richest display of this property. Most of the large scale Herbig Haro objects in the brightest part of the Orion Nebula appear to originate from a small region northeast of the strong Orion-S radio and infrared sources. With the possible exception of HH 203, we are not able to identify specific stellar sources, but do identify candidate sources for several other bright Herbig Haro objects. We find that there are optical features in the BN-KL region that can be related to the known large scale outflow that originates there. We find additional evidence for this outflow originating 500 to 1000 years ago.

19 pages, many beautiful figures, accepted by AJ

References in corpus (23)

• The distance to the Orion Nebula
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• Distance to Orion KL Measured with VERA
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• A Uniform CO Survey of the Molecular Clouds in Orion and Monoceros
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• A Cluster of 1.3 cm Continuum Sources in OMC1 South
• Identifying the outflow driving sources in Orion-KL
• Velocity Structure in the Orion Nebula. I. Spectral Mapping in Low-Ionization Lines
• Large Scale Flows from Orion-South
• Thermal-IR Detection of Optical Outflow Sources in OMC1 South
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• Sub-Arcsecond Near-Infrared Images of Massive Star Formation Region NGC 6334 V

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• Physical Conditions in Barnard's Loop, Components of the Orion-Eridanus Bubble, and Implications for the WIM Component of the ISM
• Turbulence in simulated HII regions
• Turbulence in the Ionized Gas of the Orion Nebula
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy I: HH529II and III
• Ionized gas diagnostics from protoplanetary discs in the Orion Nebula and the abundance discrepancy problem
• The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
• Integral field spectroscopy of selected areas of the Bright Bar and Orion-S cloud in the Orion Nebula
• Molecular outflows: Explosive versus protostellar
• Orion's Veil: Magnetic field strengths and other properties of a PDR in front of the Trapezium Cluster
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy III: HH514
• Properties of the ionized gas in HH202. I: Results from integral field spectroscopy with PMAS
• The three-dimensional structure of Galactic molecular cloud complexes out to 2.5 kpc
• Small-spatial scale variations of nebular properties and the abundance discrepancy in three Galactic HII regions
• Adaptive Optics Observations of 3 micron Water Ice in Silhouette Disks in the Orion Nebula Cluster and M43
• Exploring the effects of high-velocity flows in abundance determinations in H II regions. Bidimensional spectroscopy of HH 204 in the Orion Nebula
• Scattered Nebular Light in the Extended Orion Nebula
• Turbulence in compact to giant H II regions
• Deciphering the 3-D Orion Nebula-IV: The HH~269 flow emerges from the Orion-S Embedded Molecular Cloud
• The Integral Field View of the Orion Nebula
• Observing and Reducing IFUs: INTEGRAL and PMAS -- Properties of the Ionized Gas in HH 202