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Line features from Cygnus X-1 and the Crab nebula in the energy range 30–270 keV

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Abstract

A balloon-borne gemanium spectrometer was flown in an attempt to detect line-emission from Cyg X-1 and the Crab nebula in the energy range 30–270 keV. The experiment was carried out on 29–30 September, 1982. A line feature at 145 keV was observed from Cyg X-1. The intensity is (1.34±0.31)×10−2 photons cm−2 s−1 and the width is 14.3 keV FWHM. From the Crab nebula, a weak line feature with 1.8σ excess was found around 78 keV.

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Watanabe, H. Line features from Cygnus X-1 and the Crab nebula in the energy range 30–270 keV. Astrophys Space Sci 111, 157–169 (1985). https://doi.org/10.1007/BF00651525

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Keywords

  • Energy Range
  • Line Feature
  • Weak Line
  • Crab Nebula