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Detection of an X-ray-ionized nebula around the black hole candidate binary LMC X-l

Abstract

Optical spectra of the black hole candidate X-ray binary LMC X-l reveal that the system is surrounded by an extended, highly ionized He III region, N159F, which appears to be the long-sought-for example of an X-ray-photoionized nebula. The spatially resolved temperature and ionization structure allows us to measure the previously unobservable extreme ultraviolet (EUV) luminosity of an accreting compact object.

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Pakull, M., Angebault, L. Detection of an X-ray-ionized nebula around the black hole candidate binary LMC X-l. Nature 322, 511–517 (1986). https://doi.org/10.1038/322511a0

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