Other
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l.151s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Nov. 1, 1980, p. L151-L154.
Other
25
Astronomical Spectroscopy, Crab Nebula, Supernova Remnants, X Ray Spectra, Cosmic Dust, Focal Plane Devices, Interstellar Radiation, Line Spectra, Thermal Plasmas
Scientific paper
X-ray emission lines from the Crab Nebula and the surrounding region have been searched with the Focal Plane Crystal Spectrometer (FPCS) on the Einstein Observatory. A 3 x 30 arcmin and a 6 arcmin diameter circular aperture were pointed at several positions centered on, and immediately to the north and south of, the nebula. Stringent upper limits are obtained for emission in lines of N-6 (0.43 keV), O-8 (0.65 keV), Fe-17 (0.83 keV), and others - most of which are prominent in the spectra of other supernova remnants and of the sun. The observed upper limits and standard models for the emission from a thermal plasma lead to upper limits on the quantity of hot plasma within or around the Crab. In particular, previously reported emission from a 7 arcmin diameter region surrounding the Crab is probably due to scattering of X-rays from the central source by interstellar dust in the line of sight and is certainly not due to emission from a thermal plasma.
Berg J. C.
Canizares Calude R.
Clark George W.
Markert Thomas H.
Schattenburg Mark L.
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