Computer Science – Sound
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..802g&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, May 1, 1977, p. 802-814.
Computer Science
Sound
11
Crab Nebula, Emission Spectra, Energy Spectra, Pulsars, X Ray Sources, Background Radiation, Balloon Sounding, Balloon-Borne Instruments, Collimation, Instrument Errors, Radiant Flux Density, Sodium Iodides, Spectrum Analysis
Scientific paper
Results are reported for three observations of the Crab Nebula with a balloon-borne actively collimated NaI detector over the energy range from 0.2 to 10 MeV. Possible changes in instrument performance and environmental background levels during the balloon flights are investigated, and fits for source strength are made over four broad energy channels. X-ray power-law spectra and pulsed-flux fractions are determined for both the Crab Nebula and its pulsar, NP 0532. A statistically significant flux greatly in excess of the power law was detected above 1 MeV during one flight; this flux, which has declined by at least a factor of 4 or 5 at the times of more recent observations, is assumed to be real and is attributed to the nebula.
Gruber Duane E.
Ling James C.
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