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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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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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  1. Ayre, C. A., Bhat, P. N., Ma, Y. Q., Myers, R. M., and Thompson, M. G.: 1983,Monthly Notices Roy. Astron. Soc. 205, 285.

  2. Forman, W., Jones, C., Cominsky, L., Julien, P., Murray, S., Peters, G., Tananbaum, H., and Giacconi, R.: 1978,Astrophys. J. Suppl. 38, 357.

  3. Hermsen, W.: 1983,Space Sci. Rev. 36, 61.

  4. Ichimaru, S.: 1977,Astrophys. J. 214, 840.

  5. Ling, J. C., Mahoney, W. A., Willett, J. B., and Jacobson, A. S.: 1979,Astrophys. J. 231, 896.

  6. Ling, J. C., Mahoney, W. A., Wheaton, W. A., Jacobson, A. S., and Kaluzienski, L.: 1983,Astrophys. J. 275, 307.

  7. Mahoney, W. A., Ling, J. C., and Jacobson, A. S.: 1984,Astrophys. J. 278, 784.

  8. Manchanda, R. K., Bazzano, A., La Padula, C. D., Polcaro, V. F., and Ubertini, P.: 1982,Astrophys. J. 252, 172.

  9. Mandrou, P., Niel, M., Vedrenne, G., Dupont, A., and Hurley, K.: 1978,Astrophys. J. 219, 288.

  10. Nolan, P. L. and Matteson, J. L.: 1983,Astrophys. J. 265, 389.

  11. Oda, M.: 1977,Space Sci. Rev. 20, 757.

  12. Ramaty, R. and Lingenfelter, R. E.: 1979,Nature 278, 127.

  13. Ramaty, R., Kozlovsky, B., and Lingenfelter, R. E.: 1979,Astrophys. J. Suppl. 40, 487.

  14. Shapiro, S. L., Lightman, A. P., and Eardley, D. M.: 1976,Astrophys. J. 204, 187.

  15. Steinle, H., Voges, W., Pietsch, W., Reppin, C., Trümper, J., Kendziorra, E., and Staubert, R.: 1982,Astron. Astrophys. 107, 350.

  16. Strickman, M. S., Johnson, W. N., and Kurfess, J. D.: 1979,Astrophys. J. 230, L15.

  17. Strickman, M. S., Kurfess, J. D., and Johnson, W. N.: 1982,Astrophys. J. 253, L23.

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