Ultraviolet (UV) Emission Line Mapping Of Selected Regions In The Orion Nebula

Barry E. Turnrose; Peter M. Perry; Christopher A. Harvel; Randall W. Thompson; Anthony D. Mallama

doi:10.1117/12.959813

21 November 1980 Ultraviolet (UV) Emission Line Mapping Of Selected Regions In The Orion Nebula

Barry E. Turnrose, Peter M. Perry, Christopher A. Harvel, Randall W. Thompson, Anthony D. Mallama

Proceedings Volume 0264, Applications of Digital Image Processing to Astronomy; (1980) https://doi.org/10.1117/12.959813
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

Low dispersion spectra extending over the wavelength range λλ1150-3250Å have been obtained with the International Ultraviolet Explorer (IUE) satellite at 35 neighboring locations defining a mosaic within the central region of the Orion Nebula. These spectra have been processed in a unique way to assemble monochromatic images of the emission in the wavelengths of the most prominent ultraviolet (UV) spectral lines seen in the nebula: CIII] λ1909, CII] λ2326, and [OII] λ2470. The mosaic images, covering approximately a 0.6 arcminute by 2 arcminute region including part of the bright bar, have a spectral resolution of ≈6Å and a spatial resolution of ≈4-5 arcseconds. The image processing techniques used to extract each 2 arcsecond-by-2 arcsecond picture element of the mosaics from the original IUE spectra are discussed. These procedures include calculation of spectrograph orientation and thermal effects, normalization for exposure time, subtraction of background, correction for sensitivity variation within the 10 arcsecond-by 20 arcsecond IUE spectrograph aperture, correction to an absolute flux scale, sample interpolation, and display on graphic devices. The resulting UV emission line intensity maps may be used in conjunction with observations of comparable resolution in other wavelength regions to infer the spatial distribution of ionization and abundance levels of carbon and oxygen in Orion.

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Barry E. Turnrose, Peter M. Perry, Christopher A. Harvel, Randall W. Thompson, and Anthony D. Mallama "Ultraviolet (UV) Emission Line Mapping Of Selected Regions In The Orion Nebula", Proc. SPIE 0264, Applications of Digital Image Processing to Astronomy, (21 November 1980); https://doi.org/10.1117/12.959813

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KEYWORDS

Ultraviolet radiation

Image segmentation

Line width roughness

Astronomy

Carbon

Vignetting

Ionization

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