Letter | Published:

Observations of a transient X-ray source with a period of 104 s

Naturevolume 256pages628630 (1975) | Download Citation

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Abstract

DURING routine observations of the Crab Nebula by Ariel V, experiment A, the rotation modulation collimator (RMC), discovered a new X-ray source A0535+26. The source was just detectable during the first observation on April 13, and during the 16 d of observation was seen to brighten to nearly twice the Crab's intensity (in the 3–7 keV range). The source varies periodically, with a period of 104 s, and has a very flat spectrum in the 3–7 keV range.

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References

  1. 1

    Eyles, C. J., Skinner, G. K., Willmore, A. P., and Rosenberg, F. D., Nature, 254, 577, (1975).

  2. 2

    Ives, J. C., Sanford, P. W., and Bell-Burnell, S. J., Nature, 254, 578 (1975).

  3. 3

    Ricketts, M. J., Turner, M. J. L., Page, C. E., and Pounds, K. A., Nature, (1975).

  4. 4

    Eyles, C. J., Skinner, G. K., Willmore, A. P., and Rosenberg, F. D., IAU Circ., No. 2274 (1975).

  5. 5

    Staubert, R., et al., Astrophys. J. Lett. (in the press).

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Author information

Affiliations

  1. Mullard Space Science Laboratory, University College, London, UK

    • F. D. ROSENBERG
  2. Department of Space Research, University of Birmingham, UK

    • C. J. EYLES
    • , G. K. SKINNER
    •  & A. P. WILLMORE

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https://doi.org/10.1038/256628a0

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