Cyclotron line signatures of thermal and magnetic mountains from accreting neutron stars
arXiv:1409.3327 · doi:10.1093/mnras/stu1825
Abstract
Cyclotron resonance scattering features (CRSFs) in the X-ray spectrum of an accreting neutron star are modified differently by accretion mounds sustained by magnetic and thermocompositional gradients. It is shown that one can discriminate, in principle, between mounds of different physical origins by studying how the line energy, width, and depth of a CRSF depend on the orientation of the neutron star, accreted mass, surface temperature distribution, and equation of state. CRSF signatures including gravitational light bending are computed for both phase-resolved and phase-averaged spectra on the basis of self-consistent Grad-Shafranov mound equilibria satisfying a global flux-freezing constraint. The prospects of multimessenger X-ray and gravitational-wave observations with future instruments are canvassed briefly.
17 pages, 12 figures, accepted for publication in MNRAS
References in corpus (20)
- Physics of Strongly Magnetized Neutron Stars
- The Breaking Strain of Neutron Star Crust and Gravitational Waves
- A Debris Disk Around An Isolated Young Neutron Star
- The Magnificent Seven: Magnetic fields and surface temperature distributions
- Modelling magnetically deformed neutron stars
- Detecting gravitational wave emission from the known accreting neutron stars
- Discovery of a flux-related change of the cyclotron line energy in Her X-1
- A model for cyclotron resonance scattering features
- Mountains on Neutron Stars: Accreted vs. Non-Accreted crusts
- Pulse phase resolved analysis of the HMXB Cen X-3 over two binary orbits
- A Further Study of the Luminosity-Dependent Cyclotron Resonance Energies of the Binary X-ray Pulsar 4U0115+63 with RXTE
- A 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRAL
- Are neutron stars with crystalline colour superconducting cores interesting for the LIGO experiment?
- INTEGRAL observations of Her X-1
- Burial of the polar magnetic field of an accreting neutron star. II. Hydromagnetic stability of axisymmetric equilibria
- Improved estimate of the detectability of gravitational radiation from a magnetically confined mountain on an accreting neutron star
- Three-dimensional stability of magnetically confined mountains on accreting neutron stars
- Signature of Temporary Burning Front Stalling from a Non-Photospheric Radius Expansion Double-peaked Burst
- MHD instabilities in accretion mounds - 1: 2D axisymmetric simulations
- Does the accreting millisecond pulsar XTE J1814-338 precess?
Cited by in corpus (7)
- The Science of the Einstein Telescope
- Detecting gravitational waves from mountains on neutron stars in the Advanced Detector Era
- Neutron star deformation due to poloidal-toroidal magnetic fields of arbitrary multipole order: a new analytic approach
- Revisiting field burial by accretion onto neutron stars
- Relaxation by thermal conduction of a magnetically confined mountain on an accreting neutron star
- Gravitational waves from neutron-star mountains
- Swift/BAT measurements of the cyclotron line energy decay in the accreting neutron star Her X-1: indication of an evolution of the magnetic field?