The high-energy X-ray spectrum of the Crab Nebula observed from OSO-8

Details The high-energy X-ray spectrum of the Crab Nebula observed from OSO-8 The high-energy X-ray spectrum of the Crab Nebula observed from OSO-8

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..809d&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 809-814.

Astronomy and Astrophysics

Astrophysics

28

Astronomical Spectroscopy, Crab Nebula, Oso-8, X Ray Spectra, Emission Spectra, Photons, Pulsed Radiation, Spectrometers, Statistical Analysis, Steady Flow

Scientific paper

Results are reported for a measurement of the X-ray spectrum of the Crab Nebula over the energy range from 20 to 500 keV with a scintillation spectrometer aboard the OSO-8 satellite. A time-averaged spectrum of the nebula is presented which includes the average intensity of the X-ray pulsar NP 0532. The photon spectrum is shown to be well-fitted by a power law with a constant of approximately 4.19, a weighted mean energy of 39.1 keV, and a spectral index of about 2.00. No evidence is found for day-to-day variations in the spectrum of the source. The spectrum obtained is taken as evidence for the single power-law character of the Crab Nebula spectrum out to at least 200 keV and probably to as high an energy as 500 keV.

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