Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8528897h&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Cosmic X Rays, Crab Nebula, X Ray Astronomy, Balloon-Borne Instruments, High Altitude Balloons, Mathematical Models, Power Spectra, Pulsar Magnetospheres, Pulsars
Scientific paper
Astronomical observations of the Crab nebula were performed in the hard X-ray domain in the balloon experiment High Energy X-ray Experiment (HEXE). The balloon experiment, the detector systems with which it is equipped, and the behavior of the instruments during the three balloon flights are described. The Crab global power spectrum clearly shows a bend at 82 (+ or - 8) keV. Pulsar analysis shows a very strong signal in the radio period; the time-averaged high energy spectrum has a bend at 63 (+ or - 30) keV. Pulse phase spectroscopy reveals a systematic variation of the spectral index versus phase, in the sense that the spectra between peaks are harder than those of both pulses; the power spectrum bends at 41 (+ or - 10) keV. For the pulse form analysis, asymmetric modified Lorentz curves well represent the measured spectra; the pulse form parameters systematically vary with frequency and show extreme values in the hard X-ray domain. Theoretical Crab pulsar items (pulsar magnetosphere, plasma in the neighborhood of the light cylinder, relativistic compression, polarization) are discussed.
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