Is N44C a fossil X-ray ionized nebula?

Computer Science

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H Ii Regions, Nebulae, Photoionization, Stellar Spectra, X Ray Binaries, Absorption Spectra, Charge Coupled Devices, Magellanic Clouds, Spectral Line Width, Stellar Luminosity, Stellar Temperature

Scientific paper

The characteristics of the H II region N44C in the LMC are interpreted here in terms of a fossil X-ray photoionized nebula resembling the recently discovered He III region around the luminous X-ray binary LMC X-1. The presently extinct X-ray source that has been responsible for the high ionization in N44C could well be identical with the transient LMC X-5. From photon-counting arguments and recombination timescales of the interstellar plasma, it is found that less than 100 years ago the X-ray luminosity should have been comparable with that of the most luminous X-ray binaries.

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