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Low energy γ rays from PSR1822–09

Naturevolume 287pages124126 (1980) | Download Citation

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Abstract

Pulsed γ-ray emission in the MeV range (80 keV–6 MeV) has been clearly established1–4 for the Crab pulsar PSR0531+21 (P = 33 ms). The energy spectrum of the pulsed component follows a power law from the X-ray (100 keV) to the high energy γ-ray range (2. GeV) with an index close to 2.1 (ref. 5). Positive detection of pulsed γ ray emission from the Vela pulsar PSR0833–45 (P = 89 ms) has been claimed in the 10–30 MeV region by Albats et al.6, and clearly established5 in the high energy range 50 MeV–3 GeV with a power law index of 1.9. This pulsar was also observed in the X-ray range but with apparently conflicting results (ref. 7 and refs therein), some authors reporting positive detection while other have upper limits below the reported values. Other radio pulsars, especially PSR1822–09, and PSR1747–46 have been investigated at energies above 50 MeV by the satellites SAS28,9 and COS B10. We report here observations of PSR1822–09 (P = 769 ms) between 80 keV and 6 MeV at balloon altitudes.

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Affiliations

  1. Centre d'Etude Spatiale des Rayonnements–CNRS–UPS BP 4346, 31029, Toulouse Cedex, France

    • P. Mandrou
    •  & G. Vedrenne
  2. CEA, CEN–SEP Saclay BP 2, 91190, Gif sur Yvette, France

    • J. L. Masnou

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https://doi.org/10.1038/287124a0

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