Testing exterior spacetime of the neutron star via X-ray reflection spectroscopy

Abstract

The exterior geometry of a neutron star can be approximated by relativistic multipole moments of a parametrized metric using Ernst potential formalism. This spacetime can be tested with electromagnetic wave observation of astrophysical black holes. In the present paper, I simulate X-ray reflection spectra of a thin accretion disk with future X-ray missions. The purpose of this work is to understand whether X-ray reflection spectroscopy can distinguish the neutron star from the Kerr solution of General Relativity. I found that for the higher value of spin and multipole moment parameters, there are small differences in the shape of neutron star iron lines. It is hard to distinguish neutron star iron lines from Kerr ones due to the small deviations. Also, electromagnetic wave observation of slow rotating neutron stars is marginally consistent with Kerr black holes of general relativity.

arXiv commentv2: corrected some typos

References in corpus (32)

• The Confrontation between General Relativity and Experiment
• Testing General Relativity with Pulsar Timing
• Quadrupole moments of rotating neutron stars
• eXTP -- enhanced X-ray Timing and Polarimetry Mission
• A code to compute the emission of thin accretion disks in non-Kerr space-times and test the nature of black hole candidates
• Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
• Revising the multipole moments of numerical spacetimes, and its consequences
• Testing the space-time geometry around black hole candidates with the analysis of the broad K$\alpha$ iron line
• Effective No-Hair Relations for Neutron Stars and Quark Stars: Relativistic Results
• Effectively universal behavior of rotating neutron stars in general relativity makes them even simpler than their Newtonian counterparts
• Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. IV. Relativistically Broadened Iron Lines
• Profiles of emission lines generated by rings orbiting braneworld Kerr black holes
• Broad K$\alpha$ iron line from accretion disks around traversable wormholes
• K$\alpha$ iron line profile from accretion disks around regular and singular exotic compact objects
• Approximate Matching of Analytic and Numerical Solutions for Rapidly Rotating Neutron Stars
• Innermost stable circular orbits around relativistic rotating stars
• Three-Hair Relations for Rotating Stars: Nonrelativistic Limit
• Using iron line reverberation and spectroscopy to distinguish Kerr and non-Kerr black holes
• Optical effects related to Keplerian discs orbiting Kehagias-Sfetsos naked singularities
• Testing the Kerr metric with the iron line and the KRZ parametrization
• Testing Einstein-dilaton-Gauss-Bonnet gravity from the reflection spectrum of accreting black holes
• Iron K$\alpha$ line of boson stars
• The relativistic Iron K-alpha line from an accretion disc onto a static non-baryonic compact object
• An all-purpose metric for the exterior of any kind of rotating neutron star
• Towards a self-consistent relativistic model of the exterior gravitational field of rapidly rotating neutron stars
• An accurate metric for the spacetime around neutron stars
• Profiled spectral lines generated by Keplerian discs orbiting in the Bardeen and Ayon-Beato-Garcia spacetimes
• Iron K$\alpha$ line of Proca stars
• Iron K$\alpha$ line of Kerr black holes with Proca hair
• The exterior field of slowly and rapidly rotating neutron stars: Rehabilitating spacetime metrics involving hyperextreme objects
• Constraining the Kerr parameters via X-ray reflection spectroscopy
• Matching of analytical and numerical solutions for neutron stars of arbitrary rotation

Cited by in corpus (3)

• Accretion disks around the Gibbons-Maeda-Garfinkle-Horowitz-Strominger charged black holes
• Accretion disk around the rotating Damour-Solodukhin wormhole
• Iron Line from Neutron Star Accretion Disks in Scalar Tensor Theories