Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer
we report a highly significant (> 17 σ) detection of the polarization signal from an accreting …

We review topics in searches for axion-like-particles (ALPs), covering material that is
complementary to other recent reviews. The first half of our review covers ALPs in the …

Radiation from X-ray pulsars (XRPs) was expected to be strongly linearly polarized owing to
a large difference in their ordinary and extraordinary mode opacities. The launch of IXPE …

The first X-ray pulsar, Cen X-3, was discovered 50 yr ago. Radiation from such objects is
expected to be highly polarized due to birefringence of plasma and vacuum associated with …

X-ray polarimetry is a unique way to probe the geometrical configuration of highly
magnetized accreting neutron stars (X-ray pulsars). GRO J1008− 57 is the first transient X …

Discovery of pulsations from a number of ultra-luminous X-ray (ULX) sources proved that
accretion onto neutron stars can produce luminosities exceeding the Eddington limit by …

We present measurements of the polarization of X-rays in the 2–8 keV band from the pulsar
in the ultracompact low-mass X-ray binary 4U 1626–67 using data from the Imaging X-Ray …

We report on IXPE, NICER, and XMM–Newton observations of the magnetar 1E 2259+ 586.
We find that the source is significantly polarized at about or above 20 per cent for all phases …

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 …

ABSTRACT A new window is opening in high-energy astronomy: X-ray polarimetry. With
many missions currently under development and scheduled to launch as early as 2021 …