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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

G. L. Israel , A. Papitto , P. Esposito , L. Stella , L. Zampieri , A. Belfiore , G. A. Rodríguez Castillo , A. De Luca
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A. Tiengo F. Haberl J. Greiner R. Salvaterra S. Sandrelli G. Lisini
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keywords sourcex-rayaccretionluminosityodotperiodpulsarsystem
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abstract

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 4 Pith papers

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

  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 of 10

    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 of 10

    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.

  3. Physics of Strong Magnetism with eXTP

    astro-ph.HE 2025-06 unverdicted novelty 3.0 of 10

    The eXTP mission's planned instruments would enable more sensitive X-ray polarization and timing observations of magnetars and accreting pulsars, potentially testing vacuum birefringence and probing magnetic field structures.

  4. X-Ray Views of Galactic Accreting Pulsars in High-Mass X-Ray Binaries

    astro-ph.HE 2024-12 accept novelty 1.0 of 10

    A concise review of the timing, spectral, and polarization properties of accreting X-ray pulsars in high-mass X-ray binaries, including recent IXPE results.

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