Search for thermal X-ray line emission from the Crab Nebula

Details Search for thermal X-ray line emission from the Crab Nebula Search for thermal X-ray line emission from the Crab Nebula

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..27k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Aug. 15, 1977, p. L27-L29.

Astronomy and Astrophysics

Astrophysics

8

Crab Nebula, Supernova Remnants, Thermal Emission, X Ray Spectra, Astronomical Spectroscopy, Emission Spectra, High Temperature Plasmas, Oso-8, Plasma Spectra

Scientific paper

Observations of the Crab Nebula from 1.85 to 8 keV obtained with the large-area graphite crystal spectrometer on OSO-8 show a smooth featureless continuum with an absence of X-ray emission lines from highly ionized Si and S. Upper limits on the line emission are used to derive an upper limit to the emission measure for a thermal source associated with the Crab Nebula. Existing evidence for an extended thermal source is discussed, and it is shown that the evidence is not contradicted by the upper limits set with the spectrometer data.

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