Abstract
THE discovery of a low-intensity soft X-ray source in a region of the sky containing the dwarf nova AY Lyrae is reported here. Figure 1 shows how the source, designated H1839 + 37, appeared in the superposition of HEAO A2 scanning data that were taken on 9 October 1977 with the low-energy detector LED1. (A complete description of the A2 experiment on HEAO 1 is given by Rothschild et al.1.) The source was detected only in the energy interval 0.18–0.43 keV. The peak in Fig. 1 represents an intensity of 0.014 ±0.0027 counts cm−2 s−1 (5σ). An upper limit to the temperature of H1839 + 37 was derived by comparing the ratio of the source counts in different energy bands. If a thermal bremsstrahlung spectrum is assumed, TBR ≤ 5 × 106 K, whereas a black-body fit implies TBL ≤ 1.4 × 106 K. A lower limit TBL ≥ 1×105K is set by the LED1 lower-level discriminator.
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References
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CÓRDOVA, F., GARMIRE, G. Soft X-ray emission from the vicinity of the dwarf nova AY Lyrae. Nature 279, 782–783 (1979). https://doi.org/10.1038/279782a0
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DOI: https://doi.org/10.1038/279782a0
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