Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13
By G. Israel, A. Papitto, P. Esposito, L. Stella, L. Zampieri, A. Belfiore, G. A. R. Castillo, Andrea De Luca, A. Tiengo, F. Haberl and 4 more. 2016
246 citations recorded by the source corpus.
NGC 7793 P13 is a variable (luminosity range ∼100) ultraluminous X-ray source proposed to host a stellar-mass black hole of less than 15 M⊙ in a binary system with orbital period of 64 d and a 18-23 M⊙ B9Ia companion. Within the EXTraS (Exploring the X-ray Transient and variable Sky) project, we discovered pulsations at a period of ∼0.42 s in two XMM-Newton observations of NGC 7793 P13, during which the source was detected at LX ∼ 2.1 × 1039 and 5 × 1039 erg s-1 (0.3-10 keV band). These findings unambiguously demonstrate that the compact object in NGC 7793 P13 is a neutron star accreting at super-Eddington rates. While standard accretion models face difficulties accounting for the pulsar X-ray luminosity, the presence of a multipolar magnetic field with B ∼ few × 1013 G close to the base of the accretion column appears to be in agreement with the properties of the system.
Subfields: Astronomy and Astrophysics, Geophysics
View Paper: https://www.semanticscholar.org/paper/f4545ce690a8e78701afcee61981e75c4f97d491
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Citations in the corpus
- Formation of Double Neutron Star Systems (2017, background): “Such a high accretion rate is apparently evident in a ULX system with a pulsating NS accretor (Israel et al. 2017a).”
- Discovery of pulsations from NGC 300 ULX1 and its fast period evolution (2018, methodology): “…known ULPs: for NGC 7793 P13 it increases from ∼10% to ∼40% in the XMM-Newton band (Israel et al. 2017b), for NGC 5907 ULX1 it grows from ∼12% to ∼20% (Israel et al. 2017a, XMM-Newton band), and M82 X-2 also shows the highest pulsed fraction of ∼23% at higher energies (Bachetti et al. 2014,…”
- Observational evidence for intermediate-mass black holes (2017, background): “Dynamical evidence for the presence of a stellar-mass BH has been found in some ULXs (M101-X1, Liu et al. 2013; NGC 7793 P13, Motch et al. 2014, but later found to host a neutron star, Fürst et al. 2016, Israel et al. 2017b), though the most surprising case is that of M82 X-2.”
- A review of quasi-periodic oscillations from black hole X-ray binaries: Observation and theory (2019, background): “A number of subsequent detections of pulsations from other ULXs [61, 99, 100] have confirmed that at least a fraction of ULXs are powered by super-Eddington accreting NSs and have cast doubt on the simple QPO mass scaling arguments for the intermediate mass BH hypothesis – particularly since M82 X-2”