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- W4387339942 abstract "Abstract Using the Zwicky Transient Facility, in 2021 February we identified the first known outburst of the black hole X-ray transient XTE J1859+226 since its discovery in 1999. The outburst was visible at X-ray, UV, and optical wavelengths for less than 20 days, substantially shorter than its full outburst of 320 days in 1999, and the observed peak luminosity was 2 orders of magnitude lower. Its peak bolometric luminosity was only 2 × 10 35 erg s −1 , implying an Eddington fraction of about 3 × 10 −4 . The source remained in the hard spectral state throughout the outburst. From optical spectroscopy measurements we estimate an outer disk radius of 10 11 cm. The low observed X-ray luminosity is not sufficient to irradiate the entire disk, but we observe a surprising exponential decline in the X-ray light curve. These observations highlight the potential of optical and infrared synoptic surveys to discover low-luminosity activity from X-ray transients." @default.
- W4387339942 created "2023-10-05" @default.
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- W4387339942 date "2023-10-01" @default.
- W4387339942 modified "2023-10-06" @default.
- W4387339942 title "An Optically Discovered Outburst from XTE J1859+226" @default.
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- W4387339942 doi "https://doi.org/10.3847/1538-4357/acf37c" @default.
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