A newly discovered ultraluminous X-ray transient in NGC 6946 shows a strong oxygen emission line and epoch-to-epoch spectral changes that support the wind-outflow interpretation of soft ULX spectra.
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A Sparkler in the Fireworks Galaxy: Discovery of an Ultraluminous X-ray Transient with a Strong Oxygen Line in NGC 6946
A newly discovered ultraluminous X-ray transient in NGC 6946 shows a strong oxygen emission line and epoch-to-epoch spectral changes that support the wind-outflow interpretation of soft ULX spectra.