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

Ma. T. García-Díaz | Zendy; W. J. Henney | Zendy

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

Author(s) -

Ma. T. García-Díaz,

W. J. Henney

Publication year - 2007

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/510621

Subject(s) - orion nebula , physics , ionization , astrophysics , nebula , electron density , redshift , spectroscopy , emission spectrum , spectral line , astronomy , electron , stars , ion , galaxy , quantum mechanics

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

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