Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..538k&link_type=abstract
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 538-552.
Astronomy and Astrophysics
Astronomy
63
Bremsstrahlung, Crab Nebula, Gamma Ray Astronomy, Pulsars, X Ray Spectra, Compton Effect, Energy Spectra, Photon Beams, Polarization Characteristics, Pulse Duration, Pulse Rate
Scientific paper
HEAO 1 observations of the 18-200 keV pulsed emission from the Crab pulsar show that the systematic variation of spectral slope as a function of pulse shape rises continuously from 4-60 keV to at least 150 keV. This strengthens the claims for the existence of both the emission from the two main pulse peaks, and a separate, interpulse emission connecting the two peaks which contributes 22% of the total pulsed flux in the 15-200 keV range and has a harder spectrum than that of the two pulse peaks. These observations are combined with others from IR to gamma-ray energies. It is concluded that the phase-averaged pulsed spectrum, dominated by the emission from the two pulse peaks, calls for at least three power law components, and that the interpulse emission has a spectrum which is better fitted by either a thin, thermal bremsstrahlung model or a Comptonization model.
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