Velocity Structure in the Orion Nebula. I. Spectral Mapping in Low-Ionization Lines

Abstract

High-dispersion echelle spectroscopy in optical forbidden lines of O^0, S^+, and S^2+ is used to construct velocity-resolved images and electron density maps of the inner region of the Orion nebula with a resolution of 10 km s-1 x 3" x 2". Among the objects and regions newly discovered in this study are (1) the Diffuse Blue Layer: an extended layer of moderately blue-shifted, low-density, low-ionization emission in the southeast region of the nebula; (2) the Red Bay: a region to the east of the Trapezium where the usual correlation between velocity and ionization potential is very weak, and where the emitting layer is very thick; and (3) HH 873: a new redshifted jet to the southwest of the Trapezium.

Astronomical Journal, in press. Figures have been compressed to comply with arxiv size requirements. See them how they were meant to be at http://www.ifront.org/wiki/Spectral_Mapping_Paper_I

References in corpus (1)

• Dynamical HII Region Evolution in Turbulent Molecular Clouds

Cited by in corpus (31)

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• The three dimensional dynamic structure of the inner Orion Nebula
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• Spectrophotometry of the Huygens Region of the Orion Nebula, the Extended Orion Nebula, and M~43; Scattered Light Systematically Distorts Conditions Derived from Emission-Lines
• High Velocity Features in the Orion Nebula
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• A Detailed Morpho-Kinematic Model of the Eskimo, NGC 2392. A Unifying View with the Cat's Eye and Saturn Planetary Nebulae
• Large Scale Flows from Orion-South
• Turbulence in simulated HII regions
• Turbulence in the Ionized Gas of the Orion Nebula
• Pumping up the [N I] nebular lines
• Magnetic fields in star forming systems (I): Idealized synthetic signatures of dust polarization and Zeeman splitting in filaments
• Ionized gas diagnostics from protoplanetary discs in the Orion Nebula and the abundance discrepancy problem
• The 2015-2016 outburst of the classical EXor V1118 Ori
• Structure and Physical Conditions in the Huygens Region of the Orion Nebula
• Integral field spectroscopy of selected areas of the Bright Bar and Orion-S cloud in the Orion Nebula
• The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
• Deciphering the 3-D Orion Nebula-I: Expanding Shells in the Huygens Region
• Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy II: HH204
• The Orion fingers: Near-IR spectral imaging of an explosive outflow
• Raman mapping of photodissociation regions
• Layers in the Central Orion Nebula
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• The Owl and other strigiform nebulae: multipolar cavities within a filled shell
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• The Integral Field View of the Orion Nebula