Other
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329..693h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 15, 1988, p. 693-701. Research supported by the University of Okl
Other
22
Emission Spectra, Forbidden Transitions, Infrared Spectra, Nebulae, Nitrogen, Seyfert Galaxies, Supernova Remnants, Abundance, Crab Nebula, Nickel, Orion Nebula
Scientific paper
New spectrophotometric observations of the Orion and Crab Nebulae are presented, and numerous mechanisms which might explain the strong, observed forbidden Ni II emission are considered. The results indicate that an enlarged Ni(+) zone, a large effective radiative recombination coefficient, and photon pumping are unlikely explanations for the strong forbidden Ni II 7378 A emission seen in a wide variety of emission-line objects. A scenario in which forbidden Ni II emission is produced in regions where the densities are about 100,000/cu cm or more may explain the observations, although this idea implies untenable cooling times in a number of objects. Limits set by new observations on the strength of other optical forbidden Ni II lines fail to provide useful constraints for testing the atomic data. Further observational tests employing lines in the infrared are suggested which should prove helpful for understanding the emission.
Fesen Robert A.
Henry Richard B. C.
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