Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997taea....1.1000w&link_type=abstract
NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment, vol. 1, p
Physics
Lagoons, Nebulae, Sagittarius Constellation, Correction, Cosmic Rays, Dust, Electron Density (Concentration), Electron Energy, Emission Spectra, Gamma Rays, Image Analysis, Lower California (Mexico), Abundance, Bias, Charge Coupled Devices, Clumps, Constellations, Interstellar Matter, Ionization, Observatories, Pixels, Sulfur, Telescopes
Scientific paper
The Lagoon Nebula (M8) is a well known H h region in the constellation of Sagittarius. It is one of the most studied objects in the Interstellar Medium (ISM) and has been examined at all wavelengths from the radio to the gamma ray region. This study will concentrate on the optical region using CCD images taken through filters centered at select wavelengths. These wavelengths are important to understanding the physics of the nebula and include emission lines of the following ions: O(sup ++) at lambda(lambda)4363,5007, N(sup +) at lambda(lambda)5755,6584, S(sup +) at lambda(lambda)6717,6731 and H(sup +) at lambda(lambda)4861,6563. The first two sets of lines are used to determine the electron temperature (Te) of the nebula, the next pair is used to calculate the electron density (Ne) and the final pair is used to determine the amount of light which is scattered due to dust in the nebula. The CCD images used in this study were obtained at San Pedro Matir Observatory in Baja, Mexico, using the 2.12 meter telescope. The images were reduced using the Image Reduction Analysis Facility (IRAF). Corrections to the raw data included bias subtraction, dark subtraction, cosmic ray removal and corrections for flat field differences. Additional steps were necessary to produce the final images, which are Te and Ne maps of the nebula. These steps will be discussed. The maps show variations in temperature and density on a pixel-by-pixel level. The O(sup ++) images clearly show high ionization regions in the nebula near the ionizing stars, as expected, Some of the most dramatic variations can be seen in the sulfur images. Clumps, ridges and arcs of high density material are clear and well defined. These maps are used to better understand the physical conditions in M8 and the chemical abundances in the nebula.
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