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Comparing the super-eddington accretion of SMC X-3 and RX J0209.6-7427 with Swift J0243.6+6124

Abstract : We study the giant outbursts of SMC X-3 and RX J0209.6-7427 to compare their super-Eddington accretion regime with that of Swift J0243.6+6124. The high double-peak profile of SMC X-3 is found to be 0.25 phase offset from that below 2.3 × 1038erg s-1, which is similar to Swift J0243 (happened around 0.9 × 1038erg s-1). The profile of RX J0209 shows a similar 0.25 phase offset between high double-peak and low double-peak around 1.25 × 1038erg s-1. The 0.25 phase offset corresponds to a 90 degree angle change of the emission beam and strongly supports for a transition from a fan beam to a pencil beam. Their critical luminosities imply a surface magnetic field ~4 × 1013 G and 2 × 1013 G for SMC X-3 and RX J0209, respectively, based on the recently measured cyclotron line of Swift J0243. The spin-up rate and luminosity of SMC X-3 follows a relation of $\dot{\nu }\propto L^{0.94\pm 0.03}$, while that of RX J0209 follows $\dot{\nu }\propto L^{1.00\pm 0.03}$, which are similar to Swift J0243 and consistent with the prediction of a radiation-pressure-dominated (RPD) disk. These results indicate that accretion columns are indeed formed above Eddington luminosity, and the population of ULXPs likely corresponds to X-ray pulsars of highest magnetic field.
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https://hal-insu.archives-ouvertes.fr/insu-03794901
Contributor : Olivier Hauss Connect in order to contact the contributor
Submitted on : Monday, October 3, 2022 - 3:54:26 PM
Last modification on : Thursday, November 24, 2022 - 5:02:58 PM

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Jiren Liu, Georgios Vasilopoulos, Mingyu Ge, Long Ji, Shan-Shan Weng, et al.. Comparing the super-eddington accretion of SMC X-3 and RX J0209.6-7427 with Swift J0243.6+6124. Monthly Notices of the Royal Astronomical Society, 2022, ⟨10.1093/mnras/stac2746⟩. ⟨insu-03794901⟩

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