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NATURE OF THE SOFT ULX IN NGC 247: SUPER-EDDINGTON OUTFLOW AND TRANSITION BETWEEN THE SUPERSOFT AND SOFT ULTRALUMINOUS REGIMES
ABSTRACT We report on XMM-Newton / Chandra / Swift / Hubble Space Telescope observations of the ultraluminous X-ray source (ULX) in NGC 247, which is found to make transitions between the supersoft ultraluminous (SSUL) regime with a spectrum dominated by a cool (∼0.1 keV) blackbody component and the soft ultraluminous …