Infrared and optical imagery of the Crab Nebula

Details Infrared and optical imagery of the Crab Nebula Infrared and optical imagery of the Crab Nebula

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..539h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 539-547. Research supported by NASA and California I

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19

Crab Nebula, Energetic Particles, H Alpha Line, Infrared Imagery, Metal Ions, Emission Spectra, Line Spectra, Morphology, Vapor Phases

Scientific paper

The paper presents 1.644 micron forbidden-line Fe II and 1.570 micron continuum images of the Crab Nebula which are compared with optical H-alpha, forbidden-line O III, and 5100 A continuum data. While the same prominent filaments are generally apparent in all lines, no substantial variations within the nebula in the strength and morphology of forbidden-line Fe II relative to the other lines are found. The infrared to optical continuum ratio of the synchrotron nebula shows 15 - 20 percent variations which are dominated by features which appear related to the position of the pulsar. These are interpreted as variations of 0.15 in the spectral index and it is suggested that they are related to the radiative decay of energetic particles and the paths over which these particles travel from the pulsar throughout the nebula.

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