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Hot disk of the Swift J0243.6+6124 revealed by Insight-HXMT
V. Doroshenko, S. N. Zhang, A. Santangelo +113
We report on analysis of observations of the bright transient X-ray pulsar \src obtained during its 2017-2018 giant outburst with Insight-HXMT, \emph{NuSTAR}, and \textit{Swift} ob…
Discovery of a pulse-phase-transient cyclotron line in the X-ray pulsar GROJ2058+42
S. Molkov, A. Lutovinov, S. Tsygankov +2
We report the discovery of absorption features in the X-ray spectrum of the transient X-ray pulsar GROJ2058+42. The features are detected around , and keV…
The X-ray Polarization Probe mission concept
Keith Jahoda, Henric Krawczynski, Fabian Kislat +100
The X-ray Polarization Probe (XPP) is a second generation X-ray polarimeter following up on the Imaging X-ray Polarimetry Explorer (IXPE). The XPP will offer true broadband polarim…
Cyclotron emission, absorption, and the two faces of X-ray pulsar A 0535+262
Sergey S. Tsygankov, Victor Doroshenko, Alexander A. Mushtukov +3
Deep NuSTAR observation of X-ray pulsar A 0535+262, performed at a very low luminosity of erg s, revealed the presence of two spectral components. We ar…
Electron-positron pairs in hot plasma of accretion column in bright X-ray pulsars
Alexander A. Mushtukov, Igor S. Ognev, Dmitrij I. Nagirner
The luminosity of X-ray pulsars powered by accretion onto magnetized neutron stars covers a wide range over a few orders of magnitude. The brightest X-ray pulsars recently discover…
Evidence for the radiation-pressure dominated accretion disk in bursting pulsar GRO J1744-28 using timing analysis
Juhani Mönkkönen, Sergey S. Tsygankov, Alexander A. Mushtukov +3
The X-ray pulsar GRO J1744-28 is a unique source which shows both pulsations and type-II X-ray bursts, allowing studies of the interaction of the accretion disk with the magnetosph…
Broadband aperiodic variability in X-ray pulsars: accretion rate fluctuations propagating under the influence of viscous diffusion
Alexander A. Mushtukov, Galina V. Lipunova, Adam Ingram +3
We investigate aperiodic X-ray flux variability in accreting highly magnetized neutron stars - X-ray pulsars (XRPs). The X-ray variability is largely determined by mass accretion r…