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On the nature of pulse profile variations and timing noise in accreting millisecond pulsars
Juri Poutanen, Askar Ibragimov, Marja Annala
Timing noise in the data on accretion-powered millisecond pulsars (AMP) appears as irregular pulse phase jumps on timescales from hours to weeks. A large systematic phase drift is…
Polarization properties of X-ray millisecond pulsars
Juri Poutanen
Radiation of X-ray bursts and of accretion shocks in weakly magnetized neutron stars in low-mass X-ray binaries is produced in plane-parallel atmospheres dominated by electron scat…
Spectral variability of ultraluminous X-ray sources
Jari J. E. Kajava, Juri Poutanen
We study spectral variability of 11 ultraluminous X-ray sources (ULX) using archived XMM-Newton and Chandra observations. We use three models to describe the observed spectra: a po…
Accreting millisecond pulsar SAX J1808.4-3658 during its 2002 outburst: evidence for a receding disc
Askar Ibragimov, Juri Poutanen
An outburst of the accreting X-ray millisecond pulsar SAX J1808.4-3658 in October-November 2002 was followed by the Rossi X-ray Timing Explorer for more than a month. We demonstrat…