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- W2018681307 abstract "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 these galaxies. Spectral fits of the SSS data give acceptable results only for a ~90-100 eV blackbody spectrum with an intrinsic absorption column of NH ~ (2-3) × 1021 cm-2. For a distance of 19 Mpc, the best-fit observed luminosity increases from 1.7 × 1038 ergs s-1 in 1999 December to 8.0 × 1038 ergs s-1 in 2002 May. intrinsic, absorption-corrected, best-fit luminosity reaches 1.4 × 1040 ergs s-1 in 2002 May. assumption of unbeamed emission would suggest a black hole of 100 M☉. However, if the emission is blackbody at all times, as suggested by the steep soft spectrum, the radiating area would have to vary by a factor of ~103, inconsistent with gravitational energy release from within a few Schwarzschild radii of a black hole. Viable explanations for the observed properties of the SSS are provided by anisotropic emission from either an accreting nuclear-burning white dwarf or an accreting stellar-mass black hole." @default.
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- W2018681307 date "2003-07-10" @default.
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- W2018681307 title "A Variable Ultraluminous Supersoft X‐Ray Source in “The Antennae”: Stellar‐Mass Black Hole or White Dwarf?" @default.
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- W2018681307 doi "https://doi.org/10.1086/375441" @default.
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