Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5605l&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #56.05; Bulletin of the American Astronomical Society, Vol. 26, p.951
Astronomy and Astrophysics
Astronomy
Scientific paper
Spectroscopy of ten semi-stellar, line-emitting knots in the Crab Nebula has been obtained using multi-slit aperture plates at the Multiple Mirror Telescope. Wavelength coverage is 3500--8200 Angstroms, with a velocity resolution of approximately 250 km s(-1) . These knots are strikingly aligned in arcs extending to the north and south from the pulsar. Their spectra are highly atypical for Crab Nebula filamentary gas, showing anomalously strong lines from collisionally excited, heavy elements. In particular, these knots tend to have significantly stronger [S II] lambda lambda 6717, 6731 and [Ar III] lambda lambda 7136, 7751 emissions relative to H_β, as compared to surrounding filaments. We discuss the roles of temperature, ionization, and chemical abundances for producing the anomalous spectra, and also the implications for the nature of these knots and their relationship to the pulsar.
Lawrence Stephen S.
MacAlpine Gordon M.
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