M51 ULX-7: super-orbital periodicity and constraints on the neutron star magnetic field
arXiv:1911.09670 · doi:10.1093/mnras/stz3298
Abstract
In the current work we explore the applicability of standard theoretical models of accretion to the observed properties of M51 ULX-7. The spin-up rate and observed X-ray luminosity are evidence of a neutron star with a surface magnetic field of G, rotating near equilibrium. Analysis of the X-ray light-curve of the system (Swift/XRT data) reveals the presence of a 39 d super-orbital period. We argue that the super-orbital periodicity is due to disc precession, and that material is accreted onto the neutron star at a constant rate throughout it. Moreover, by attributing this modulation to the free precession of the neutron star we estimate a surface magnetic field strength of G. The agreement of these two independent estimates provide strong constraints on the surface polar magnetic field strength of the neutron star.
11 pages, 6 figures, accepted for publication in MNRAS
References in corpus (26)
- An online repository of Swift/XRT light curves of GRBs
- An Ultraluminous X-ray Source Powered by An Accreting Neutron Star
- Super-critically accreting stellar-mass black holes as ultraluminous X-ray sources
- An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907
- Discovery of coherent pulsations from the Ultraluminous X-ray Source NGC 7793 P13
- Thermal and Bulk Comptonization in Accretion-Powered X-Ray Pulsars
- A spectral-timing model for ULXs in the super-critical regime
- Using Neutron Star Observations to Determine Crust Thicknesses, Moments of Inertia, and Tidal Deformabilities
- The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
- A rapidly-changing jet orientation in the stellar-mass black hole V404 Cygni
- Pulsing ULXs: tip of the iceberg?
- Optically thick envelopes around ULXs powered by accreating neutron stars
- ULX spectra revisited: Accreting, highly magnetized neutron stars as the engines of ultraluminous X-ray sources
- Evidence for precession of the isolated neutron star RX J0720.4-3125
- A 78 Day X-ray Period Detected from NGC 5907 ULX1 by Swift
- Searching for Outflows in Ultraluminous X-ray Sources Through High-Resolution X-ray Spectroscopy
- No magnetars in ULXs
- Super-Eddington accretion discs with advection and outflows around magnetized neutron stars
- Mode switching and oscillations in PSR B1828-11
- Two ~35 day clocks in Her X-1: evidence for neutron star free precession
- Modeling the light curves of ultraluminous X-ray sources as precession
- A New Two-Fluid Radiation-Hydrodynamical Model for X-ray Pulsar Accretion Columns
- SWIFT Detection of a 65-Day X-ray Period from the Ultraluminous Pulsar NGC 7793 P13
- Uncovering Red and Dusty Ultraluminous X-ray Sources with Spitzer
- Evidence for the radiation-pressure dominated accretion disk in bursting pulsar GRO J1744-28 using timing analysis
- A Possible 55-day X-ray Period of the Ultraluminous Accreting Pulsar M82 X-2
Cited by in corpus (3)
- The 2019 super-Eddington outburst of RX J0209.6-7427: Detection of pulsations and constraints on the magnetic field strength
- Orbital and super-orbital periods in ULX pulsars, disc-fed HMXBs, Be/X-ray binaries and double-periodic variables
- On the Magnetic Fields, Beaming Fractions, and Fastness Parameters of Pulsating Ultra-Luminous X-Ray Sources