Digital analysis of narrow band imagery of the Cygnus loop

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dc.contributor.advisorDufour, Reginald J.en_US
dc.contributor.committeeMemberClayton, Donald W.en_US
dc.contributor.committeeMemberFew, Arthur A.en_US
dc.creatorHester, John Jeffreyen_US
dc.date.accessioned2018-12-18T21:15:02Zen_US
dc.date.available2018-12-18T21:15:02Zen_US
dc.date.issued1983en_US
dc.description.abstractDigital analysis of narrow passband direct imagery of a field in the southeast part of the Cygnus Loop SNR is presented. Calibrated surface brightness and spectral line ratio maps involving emission lines from six different ionic species are shown. The detailed morphology of the remnant and correlations between various line ratios are discussed in the context of recent shock model calculations. The spatial structure is categorized on the basis of the presence or absence of features in images isolating different emission lines, and the correlation or lack thereof between these features and features in the maps of spectral line ratios such as [ III] 57/Ha. For a common type of structure, features present in line ratio maps are not associated with surface brightness features. These same structures also demonstrate spectral behavior consistent with that predicted by steadyflow shock calculations, indicating the presence of steady-flow shocks with velocities from <= 6 km/sec to ≈ 12 km/sec. Differences in the morphologies of the remnant as viewed in different emission lines and gradients in spectral line ratios are interpreted as a continuous transition with distance behind the blast wave from non-steady-flow shocks with velocities >= 13 km/sec to steady-flow shocks with velocities ≈ 6 km/sec .en_US
dc.format.digitalOriginreformatted digitalen_US
dc.format.extent88 ppen_US
dc.identifier.callnoThesis Sp. Sci. 1983 Hesteren_US
dc.identifier.citationHester, John Jeffrey. "Digital analysis of narrow band imagery of the Cygnus loop." (1983) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/103892">https://hdl.handle.net/1911/103892</a>.en_US
dc.identifier.digitalRICE1518en_US
dc.identifier.urihttps://hdl.handle.net/1911/103892en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.titleDigital analysis of narrow band imagery of the Cygnus loopen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentSpace Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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