Abstract
A spectral feature, apparently an absorption line, has been observed at an energy of 20.1 ± 0.5 ke V in the pulsed flux of 3.61 s X-ray pulsar 4U0115 + 63 using the UCSD/MIT instrument on HEAO 1. The line strength, expressed as equivalent width, is 3.1 ± 0.5 ke V. Although essentially unresolved, the feature has a depth more than 60% of the continuum flux. If the feature arises by cyclotron resonance absorption near the magnetic poles of the neutron star, it implies a magnetic field of between ≈1.8 and ≈2.5 × 1012 G depending on the gravitational redshift (≲5–40%).
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Wheaton, W., Doty, J., Primini, F. et al. An absorption feature in the spectrum of the pulsed hard X-ray flux from 4U0115 + 63. Nature 282, 240–243 (1979). https://doi.org/10.1038/282240a0
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DOI: https://doi.org/10.1038/282240a0
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