Abstract
The investigation reported here of the variable source Circinus X-1 (Cir X-1) reveals that it is embedded in a nebula of steady radio emission extending over several parsecs, orders of magnitude larger than the binary stellar system responsible for the fluctuating component of emission (detected at X-ray, radio and optical wavelengths). This is in marked contrast to most X-ray binaries, where an envelope of radio emission is conspicuously absent. There are difficulties in explaining the emission, but analogies with SS433 and the Crab nebula suggest possible models.
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Haynes, R., Komesaroff, M., Little, A. et al. A radio nebula associated with Circinus X-1. Nature 324, 233–235 (1986). https://doi.org/10.1038/324233a0
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DOI: https://doi.org/10.1038/324233a0
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