Magnetars and axion-like particles: probes with the hard X-ray spectrum
Magnetars and axion-like particles: probes with the hard X-ray spectrum
Abstract 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 …