Abstract The X-ray pulsar GX 1+4 was observed during a balloon flight from Alice Springs, Australia on November 20, 1986. Significant flux was detected over the full energy range of the detector (15 – 114 keV). The spectrum was very hard with a photon power law index of 1.9 ± 0.2. The intensity at 30 keV was (5.1±0.2) × 10−4 cm−2s−1keV−1; a factor of ∼ 3 less than typical during the 1970's but orders of magnitude greater than during recent satellite measurements. The pulse profiles below ∼ 75 keV were very broad with indications of a notch at the peak. At higher energies there was a remarkable change with a narrow pulse of phase width ∼ 0.2 centred on the phase of the lower energy notch. We believe this to be the first observation of phase reversals in pulse profiles in the hard X-ray energy range. The observational evidence can be explained within the framework of a model based on two-photon emission as the dominant continuum source. This requires a magnetic field ∼ 2 × 1013 gauss — a value consistent with accretion models in which the system has a retrograde disc.


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    Titel :

    Energy spectrum and pulse profiles of the binary pulsar GX 1 + 4


    Beteiligte:
    Dieters, S.W.B. (Autor:in) / Greenhill, J.G. (Autor:in) / Sharma, D.P. (Autor:in) / Sood, R.K. (Autor:in) / Waldron, L. (Autor:in) / Storey, M.C. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1991-01-01


    Format / Umfang :

    5 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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