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Fürst, F.; Walton, D. J.; Harrison, F. A.; Stern, D.; Barret, D.; Brightman, M.; Fabian, A. C.; Grefenstette, B.; Madsen, K. K.; Middleton, M. J.; Miller, J. M.; Pottschmidt, K.; Ptak, A.; Rana, V.; Webb, N.
Astrophysical journal. Letters, 11/2016, Letnik: 831, Številka: 2Journal Article
ABSTRACT We report the detection of coherent pulsations from the ultraluminous X-ray source (ULX) NGC 7793 P13. The 0.42 s nearly sinusoidal pulsations were initially discovered in broadband X-ray observations using XMM-Newton and NuSTAR taken in 2016. We subsequently also found pulsations in archival XMM-Newton data taken in 2013 and 2014. The significant (>5 ) detection of coherent pulsations demonstrates that the compact object in P13 is a neutron star, and given the observed peak luminosity of 1040 erg s − 1 (assuming isotropy), it is well above the Eddington limit for a 1.4 M accretor. This makes P13 the second ULX known to be powered by an accreting neutron star. The pulse period varies between epochs, with a slow but persistent spin-up over the 2013-2016 period. This spin-up indicates a magnetic field of B 1.5 × 1012 G, typical of many Galactic accreting pulsars. The most likely explanation for the extreme luminosity is a high degree of beaming; however, this is difficult to reconcile with the sinusoidal pulse profile.
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