X-Rays from V723 Mon are due to Optical Loading in Swift XRT
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2021-11
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Hare, Jeremy et al.; X-Rays from V723 Mon are due to Optical Loading in Swift XRT; Research Notes of the AAS, Volume 5, Number 11, November, 2021; https://doi.org/10.3847/2515-5172/ac35e5
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
V723 Mon was recently reported to be hosting the nearest (d = 460 pc) candidate black hole by Jayasinghe et al. An X-ray detection was claimed based on deep Swift XRT observations with a luminosity of Lₓ ≈ 8 × 10²⁹ erg s⁻¹ or Lₓ/LEdd ≈ 10⁻⁹. Here we show that the X-ray photons detected by Swift XRT are due to optical loading from the bright (V = 8.3 mag) star. Using events in the 2–10 keV energy band, where optical loading does not strongly contribute, we find a 3σ upper-limit on the unabsorbed 2–10 keV X-ray flux of Fₓ < 2.8 × 10⁻¹⁴ erg cm⁻² s⁻¹, corresponding to a luminosity Lₓ < 7.2 × 10²⁹ erg s⁻¹ at a distance of 460 pc or Lₓ/LEdd ≲ 2 × 10⁻⁹ for a M ≈ 3M⊙ black hole.