Digital analysis of narrow-band imagery of the Cygnus Loop

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photography, Digital Techniques, Shock Waves, Supernova Remnants, Astronomical Models, Calibrating, Data Reduction, Emission Spectra, Line Spectra, Spectrophotometry

Scientific paper

Calibrated surface brightness and spectral line ratio maps which involve emission from six different ionic species are derived from the digital analysis of narrow passband direct imagery of a field in the southeast part of the Cygnus Loop SNR, and the spatial structure is categorized on the basis of the presence or absence of features in images isolating different emission lines. While features present in all emission lines are found to have spectral behavior consistent with steady flow shock model calculations for a range of v(s), the features present only in such 'hot' lines as the O III forbidden line 5007 A are found to account for relative intensities of that line greater than can be matched by steady flow model calculations.

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