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Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13

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arxiv 1609.06538 v2 pith:KORIVFZD submitted 2016-09-21 astro-ph.HE

Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13

G. L. Israel , A. Papitto , P. Esposito , L. Stella , L. Zampieri , A. Belfiore , G. A. Rodr\'iguez Castillo , A. De Luca
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A. Tiengo F. Haberl J. Greiner R. Salvaterra S. Sandrelli G. Lisini
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classification astro-ph.HE
keywords sourcex-rayaccretionluminosityodotperiodpulsarsystem
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NGC 7793 P13 is a variable (luminosity range ~100) ultraluminous X-ray source (ULX) proposed to host a stellar-mass black hole of less than 15 M$_{\odot}$ in a binary system with orbital period of 64 d and a 18-23 M$_{\odot}$ B9Ia companion. Within the EXTraS 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 $L_{\mathrm{X}}\sim2.1\times10^{39}$ and $5\times10^{39}$ 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 $\times$ 10$^{13}$ G close to the base of the accretion column appears to be in agreement with the properties of the system.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Significant or Not? The Impact of Randomisation During Data Reduction on Confirming a New Pulsating Ultraluminous X-ray Source Candidate in Centaurus A

    astro-ph.HE 2026-05 conditional novelty 7.0

    A soft-spectrum PULX candidate is reported in Cen A but XMM-SAS randomisation during data reduction renders the marginal 1.27 Hz pulsation detection unreliable across repeated reductions.

  2. Deep optical spectroscopic monitoring of the pulsating ULX NGC 1313 X-2 with longslit Gemini observations

    astro-ph.HE 2026-06 unverdicted novelty 4.0

    Gemini spectroscopy suggests an A-type supergiant donor in NGC 1313 X-2 and provides updated constraints on orbital parameters, disk size, and gas bubble expansion.