Letter | Published:

High-energy γ-ray light curve of PSR0531 + 21

Nature volume 296, pages 723726 (22 April 1982) | Download Citation

Subjects

Abstract

The Crab pulsar (PSR0531 + 21) was one of the earliest identified sources of high-energy γ radiation1–6. As such it was selected as the first object of detailed study by ESA's γ-ray astronomy satellite COS B, launched in August 1975. The experiment and mission have been described elsewhere7. In the first 6 yr of operation COS B has made five observations (each of 30–40 days duration) in which PSR0531 + 21 was within 15° of the centre of the field of view. The first of these confirmed the result of the SAS 2 experiment that the γ-ray light curve for energies above a few tens of MeV consisted essentially of two equally strong peaks but the later measurements found a decrease in the strength of the second peak relative to the first. No change was observed in the 2–12 keV X-ray light curve simultaneously measured by COS B. The total data from the five observations contain the first evidence of interpulse emission between the two peaks in the energy range 50–3,000 MeV.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    , & Nature phys. Sci. 232, 99–101 (1971).

  2. 2.

    et al. Nature 240, 221–224 (1972).

  3. 3.

    , & Astrophys. J. 180, 547–549 (1973).

  4. 4.

    et al. Nature phys. Sci. 242, 117–120 (1973).

  5. 5.

    , , , & Astrophys. J. 184, 571–580 (1973).

  6. 6.

    et al. Nature 251, 397–399 (1974).

  7. 7.

    et al. Proc. 12th ESLAB Symp. ESA SP-124, 3–11 (1977).

  8. 8.

    Publ. astr. Soc. Pac. 83, 491–492 (1971).

  9. 9.

    , , & Astr. J. 82, 309–312 (1977).

  10. 10.

    , , , & Proc. 9th ESLAB Symp. ESRO SP-106, 353–362 (1974).

  11. 11.

    , , , & Proc. 12th ESLAB Symp. ESA SP-124, 309–316 (1977).

  12. 12.

    et al. Non-Solar Gamma Rays, Advances in Space Exploration Vol. 7 (eds Cowsik, R. & Wills, R. D.) 49–53 (Pergamon, Oxford, 1980).

  13. 13.

    et al. Astr. Astrophys. 61, 279–284 (1977).

  14. 14.

    et al. Astr. Astrophys. 90, 163–169 (1980).

  15. 15.

    , & Nature 228, 445–450 (1970).

  16. 16.

    , , & Astrophys. J. Lett. 203, L57–L61 (1976).

  17. 17.

    thesis, Univ. Leiden (1980).

  18. 18.

    , , , & Astrophys. J. 213, 252–262 (1979).

  19. 19.

    et al. Proc. 17th int. Cosmic Ray Conf., Paris 1, 22–25 (1980).

  20. 20.

    , & Nature 283, 50–51 (1980).

  21. 21.

    , & Nature 224, 50–51 (1969).

  22. 22.

    Astrophys. J. Lett. 168, L39–L42 (1971).

  23. 23.

    , & Nature phys. Sci. 232, 120–121 (1971).

  24. 24.

    et al. Nature 266, 431–433 (1977).

  25. 25.

    & Astrophys. J. 216, 560–564 (1977).

  26. 26.

    & Astrophys. J. (submitted).

  27. 27.

    , & Astrophys. J. 209, 592–601 (1978).

  28. 28.

    & Mon. Not. R. astr. Soc. 181, 761–767 (1977).

  29. 29.

    Proc. IAU Symp. No. 94, 175–204 (1981).

  30. 30.

    Proc. IAU Symp. No. 95, 241–250 (1981).

Download references

Author information

Affiliations

  1. Space Science Department of the European Space Agency, ESTEC, Noordwijk, The Netherlands

    • R. D. Wills
    •  & K. Bennett
  2. Istituto di Fisica Cosmica del CNR, Milano, Italy

    • G. F. Bignami
    •  & P. A. Caraveo
  3. Istituto di Fisica Cosmica e Informatica del CNR, Palermo, Italy

    • R. Buccheri
    •  & B. Sacco
  4. Cosmic Ray Working Group, Huygens Laboratorium, Leiden, The Netherlands

    • W. Hermsen
  5. Max Planck Institut fur Extraterrestrische Physik, Garching bei München, FRG

    • G. Kanbach
    •  & H. A. Mayer-Hasselwander
  6. Service d'Electronique Physique, Centre d'Etudes Nucléaires de Saclay, France

    • J. L. Masnou
    •  & J. A. Paul

Authors

  1. Search for R. D. Wills in:

  2. Search for K. Bennett in:

  3. Search for G. F. Bignami in:

  4. Search for R. Buccheri in:

  5. Search for P. A. Caraveo in:

  6. Search for W. Hermsen in:

  7. Search for G. Kanbach in:

  8. Search for J. L. Masnou in:

  9. Search for H. A. Mayer-Hasselwander in:

  10. Search for J. A. Paul in:

  11. Search for B. Sacco in:

About this article

Publication history

Received

Accepted

Published

DOI

https://doi.org/10.1038/296723a0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.