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Study of the X-ray pulsar IGR J19294+1816 with NuSTAR: detection of cyclotron line and transition to accretion from the cold disc
Sergey S. Tsygankov, Victor Doroshenko, Alexander A. Mushtukov +2
In the work we present the results of two deep broad-band observations of the poorly studied X-ray pulsar IGR J19294+1816 obtained with the NuSTAR observatory. The source was obser…
Timing properties of ULX pulsars: optically thick envelopes and outflows
Alexander A. Mushtukov, Adam Ingram, Matthew Middleton +2
It has recently been discovered that a fraction of ultra-luminous X-ray sources (ULXs) exhibit X-ray pulsations, and are therefore powered by super-Eddington accretion onto magneti…
Dramatic spectral transition of X-ray pulsar GX 304-1 in low luminous state
Sergey S. Tsygankov, Alicia Rouco Escorial, Valery Suleimanov +5
We report on the discovery of a dramatic change in the energy spectrum of the X-ray pulsar GX 304-1 appearing at low luminosity. Particularly, we found that the cutoff power-law sp…
Discovery of X-rays from the old and faint pulsar J1154--6250
Andrei P. Igoshev, Sergey S. Tsygankov, Michela Rigoselli +4
We report on the first X-ray observation of the 0.28 s isolated radio pulsar PSR J1154--6250 obtained with the XMM-Newton observatory in February 2018. A point-like source is firml…
On the magnetic field of the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124
Sergey S. Tsygankov, Victor Doroshenko, Alexander A. Mushtukov +2
We report on the monitoring of the final stage of the outburst from the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124, which reached 40 Eddington luminosities…
Ultraluminous X-ray sources as neutrino pulsars
Alexander A. Mushtukov, Sergey S. Tsygankov, Valery F. Suleimanov +1
The classical limit on the accretion luminosity of a neutron star is given by the Eddington luminosity. The advanced models of accretion onto magnetized neutron stars account for t…