Fig. 1.
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Light curve of RX J0440 during the 2022–2023 outburst. The black points represent Swift/BAT (15–50 keV) data, while the gray strip marks the supercritical regime, identified by Salganik et al. (2023) and Li et al. (2023). The green and red strips indicate the first and second IXPE observations, respectively. Luminosity values were calculated assuming a distance of 2.4 kpc to the source (Bailer-Jones et al. 2021).
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