Distribution of the He I 5876 A/H-beta line emission ratio in the Crab Nebula

Details Distribution of the He I 5876 A/H-beta line emission ratio in the Crab Nebula Distribution of the He I 5876 A/H-beta line emission ratio in the Crab Nebula

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1511u&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, June 1987, p. 1511-1513. AAS-supported research.

Astronomy and Astrophysics

Astronomy

28

Crab Nebula, Emission Spectra, Line Spectra, Radiation Distribution, Filaments, H Beta Line, Helium, Interstellar Matter, Matched Filters, Pulsars, Spatial Distribution

Scientific paper

Interference-filter images of the Crab Nebula have been employed to produce a map of the He I 5876 A/H-beta line-intensity ratio over the bright filamentary structure. Calibrations with published slit spectroscopy and theoretical calculations indicate that most of the nebular gas is characterized by at least a 75 percent helium mass fraction if the lines arise from recombination. However, collisional excitation of He I lines may be appreciable. The line ratio distribution is markedly nonuniform, including a large, patchy, low-helium region near the base of the tubular 'jet' structure and exceptionally high He I emitting areas defining an extended, broken strip across the pulsar.

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