Can I read Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum on EtoBox?

Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum by Fortin, Jean-François; Guo, Huai-Ke; Harris, Steven P.; Sheridan, Elijah; Sinha, Kuver is a scholarly article available to read on EtoBox.

What is Magnetars and Axion-like Particles: Probes with the Hard X-ray Spectrum about?

Quiescent hard X-ray and soft gamma-ray emission from neutron stars constitute a promising frontier to explore axion-like-particles (ALPs). ALP production in the core peaks at energies of a few keV to a few hundreds of keV; subsequently, the ALPs escape and convert to photons in the magnetosphere. The emissivity goes as $\sim T^6$ while the conversion probability is enhanced for large magnetic fields, making magnetars, with their high core temperatures and strong magnetic fields, ideal targets for probing ALPs. We compute the energy spectrum of photons resulting from conversion of ALPs in the magnetosphere and then compare it against hard X-ray data from NuSTAR, INTEGRAL, and XMM-Newton, for a set of eight magnetars for which such data exists. Upper limits are placed on the product of the ALP-nucleon and ALP-photon couplings. For the production in the core, we perform a calculation of the ALP emissivity in degenerate nuclear matter modeled by a relativistic mean field theory. The reduction of the emissivity due to improvements to the one-pion exchange approximation is incorporated, as is the suppression of the emissivity due to proton superfluidity in the neutron star core. A range

Author

Fortin, Jean-François; Guo, Huai-Ke; Harris, Steven P.; Sheridan, Elijah; Sinha, Kuver

Published

2021

Language

EN