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A Variable Ultraluminous Supersoft X‐Ray Source in “The Antennae”: Stellar‐Mass Black Hole or White Dwarf?
The Chandra monitoring observations of "The Antennae" (NGC 4038/4039) have led to the discovery of a variable, luminous, supersoft source (SSS). This source is detected only at energies below 2 keV and, in 2002 May, reached count rates comparable to those of the nine ultraluminous X-ray sources (ULXs) detected in …