The Crab Nebula - High energy X-ray observation of a lunar occultation

Details The Crab Nebula - High energy X-ray observation of a lunar occultation The Crab Nebula - High energy X-ray observation of a lunar occultation

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201l..15s&link_type=abstract

Astrophysical Journal, vol. 201, Oct. 1, 1975, pt. 2, p. L15-L19. Research supported by the Science Research Council of England

Other

9

Crab Nebula, Lunar Occultation, X Ray Spectroscopy, Energy Transfer, Mathematical Models, Normal Density Functions, Poisson Equation, Radiant Flux Density, Radiation Sources, Satellite Observation, Scintillation Counters, Statistical Analysis

Scientific paper

A lunar occultation of the Crab Nebula was observed at X-ray energies above 15 keV by a scintillation counter on a Skylark project launched in 1974. The angular extent of the region of emission of 75 per cent of the total flux between 15 and 150 keV (average photon energy 39 keV) along position angle 263 deg is found to be 110 (plus or minus 25) sec. The offset of the centroid of the extended source is such that its projection to the west of NP 0532 is 8 (plus or minus 6) sec. The variation of size with energy, as found from this and other measurements, sets constraints on models for energy transfer along magnetic field lines in the Crab.

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