Ruth M E Kelly
A5049363163- High-pressure geophysics and materials
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Space Science and Extraterrestrial Life
University College London
2023-2024
Abstract Magnetars are the most strongly magnetized neutron stars, and one of promising targets for X-ray polarimetric measurements. We present here first Imaging Polarimetry Explorer observation magnetar 1RXS J170849.0-400910, jointly analyzed with a new Swift archival NICER data. The total (energy- phase-integrated) emission in 2–8 keV energy range is linerarly polarized, at ∼35% level. phase-averaged polarization signal shows marked increase energy, ranging from ∼20% 2–3 up to ∼80% 6–8...
Magnetars, the most strongly magnetised neutron stars, are among promising targets for X-ray polarimetry. The Imaging Polarimetry Explorer (IXPE), first satellite devoted to exploring sky in polarised X-rays, has observed four magnetars date. A proper interpretation of IXPE results requires development new atmospheric models that can take into account effects vacuum on par with those plasma. Here we investigate mode conversion at resonance polarisation properties magnetar emission by...
The Search for Extraterrestrial Intelligence aims to find evidence of technosignatures, which can point toward the possible existence technologically advanced extraterrestrial life. Radio signals similar those engineered on Earth may be transmitted by other civilizations, motivating technosignature searches across entire radio spectrum. In this endeavor, low-frequency band has remained largely unexplored; with prior primarily above 1 GHz. survey at 110-190 MHz, observations 1,631,198 targets...
ABSTRACT Magnetars are neutron stars that host huge, complex magnetic fields which require supporting currents to flow along the closed field lines. This makes magnetar atmospheres different from those of passively cooling because heat deposited by back-flowing charges impinging on star surface layers. particle bombardment is expected imprint spectral and, even more, polarization properties emitted thermal radiation. We present solutions for radiative transfer problem bombarded...