On the Magnetic Field of the Ultraluminous X-Ray Pulsar M82 X-2

  title={On the Magnetic Field of the Ultraluminous X-Ray Pulsar M82 X-2},
  author={Kun Xu and Xiang-Dong Li},
  journal={The Astrophysical Journal},
The discovery of the ultraluminous X-ray pulsar M82 X-2 has stimulated lively discussion on the nature of the accreting neutron star. In most of the previous studies the magnetic field of the neutron star was derived from the observed spin-up/down rates based on the standard thin, magnetized accretion disk model. However, under super-Eddington accretion the inner part of the accretion disk becomes geometrically thick. In this work we consider both radiation feedback from the neutron star and… 

Figures from this paper

On the magnetic fields of ultraluminous X-ray pulsars
So far quite a few ultraluminous X-ray (ULX) pulsars have been discovered. In this work, we construct a super-Eddington, magnetic accretion disk model to estimate the dipole magnetic field of eight
Accreting magnetars: linking ultraluminous X-ray pulsars and the slow pulsation X-ray pulsars
  • H. Tong, W. Wang
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2018
Possible manifestations of accreting magnetars are discussed. It is shown that the four ultra-luminous X-ray pulsars can be understood in the accreting low magnetic field magnetar scenario. The
On the Fallback Disk around the Slowest Isolated Pulsar, 1E 161348-5055
The central compact object 1E 161348$-$5055 in the supernova remnant RCW 103 has a spin period $\sim 6.67$ hr, making it the slowest isolated pulsar. It is believed that a supernova fallback disk is
Hot disk of the Swift J0243.6+6124 revealed by Insight-HXMT
We report on analysis of observations of the bright transient X-ray pulsar Swift J0243.6+6124 obtained during its 2017-2018 giant outburst with Insight-HXMT, NuSTAR, and Swift observatories. We
A Population of Neutron Star Ultraluminous X-Ray Sources with a Helium Star Companion
It was recently proposed that a significant fraction of ultraluminous X-ray sources (ULXs) actually host a neutron star (NS) accretor. We have performed a systematic study on the NS ULX population in
Unifying neutron star sub-populations in the supernova fallback accretion model
We employ the supernova fallback disk model to simulate the spin evolution of isolated young neutron stars (NSs). We consider the submergence of the NS magnetic fields during the supercritical
Do the Periodic Activities of Repeating Fast Radio Bursts Represent the Spins of Neutron Stars?
Fast radio bursts (FRBs) are mysterious radio transients with millisecond durations. Recently, ∼16 days of periodic activity and ∼159 days of possible periodicity were detected to arise from FRB


Accretion mode of the ultraluminous X-ray source M82 X-2
Periodic pulsations have been found in emission from the ultra-luminous X-ray source (ULX) M82 X-2, strongly suggesting that the emitter is a rotating neutron star rather than a black hole. However,
A Population of Ultraluminous X-ray Sources with An Accreting Neutron Star
Most ultraluminous X-ray sources (ULXs) are believed to be X-ray binary systems, but previous observational and theoretical studies tend to prefer a black hole rather than a neutron star accretor.
Accretion by rotating magnetic neutron stars. III. Accretion torques and period changes in pulsating X-ray sources.
We use the solutions of the two-dimensional hydromagnetic equations obtained previously to calculate the torque on a magnetic neutron star accreting from a Keplerian disk. We find that the magnetic
Optically thick envelopes around ULXs powered by accreating neutron stars
Magnetized neutron stars power at least some ultraluminous X-ray sources. The accretion flow in these cases is interrupted at the magnetospheric radius and then reaches the surface of a neutron star
Propeller effect in action in the ultraluminous accreting magnetar M82 X-2
We present here the first convincing observational manifestation of a magnetar-like magnetic field in an accreting neutron star in binary system - the first pulsating ultra-luminous X-ray source X-2
On the Formation of Ultraluminous X-ray Sources with Neutron Star Accretors: the Case of M82 X-2
The recent discovery of a neutron star accretor in the ultra-luminous X-ray source M82 X-2 challenges our understanding of high-mass X-ray binary formation and evolution. By combining binary
Modelling the spin equilibrium of neutron stars in low‐mass X‐ray binaries without gravitational radiation
In this paper we discuss the spin equilibrium of accreting neutron stars in low-mass X-ray binaries (LMXBs). We demonstrate that, when combined with a naive spin-up torque, the observed data lead to
The ultraluminous X-ray source NuSTAR J095551+6940.8: a magnetar in a high-mass X-ray binary
The recent detection of pulsations from the ultra luminous X-ray source (ULX) NuSTAR J095551+6940.8 in M82 by Bachetti et al. indicates that the object is an accreting neutron star in a high mass
Super-Eddington Accretion in the Ultraluminous X-ray Source NGC 1313 X-2: An Ephemeral Feast
We investigate the X-ray spectrum, variability, and the surrounding ionized bubble of NGC 1313 X-2 to explore the physics of super-Eddington accretion. Beyond the Eddington luminosity, the accretion
The X-ray Pulsar M82 X-2 on its Propeller Line
{\it NuSTAR} has detected pulsations from the ultraluminous X-ray source X-2 in M82 and archival {\it Chandra} observations have given us a good idea of its duty cycle. The newly discovered pulsar