Search Publications
Positron annihilation spectrum from the Galactic Centre region observed by SPI/INTEGRAL
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +2 more
The electron-positron annihilation spectrum observed by SPI/INTEGRAL during deep Galactic Centre region exposure is reported. The line energy (510.954+/-0.075 keV) is consistent with the unshifted annihilation line. The width of the annihilation line is 2.37 +/- 0.25 keV (full width at half-maximum), while the strength of the ortho-positronium con…
A quantum electrodynamics model for non-thermal emission from soft gamma repeaters and anomalous X-ray pulsars
Hernquist, Lars; Heyl, Jeremy S.
Previously, we showed that, owing to effects arising from quantum electrodynamics (QED), magnetohydrodynamic fast modes of sufficient strength will break down to form electron-positron pairs while traversing the magnetospheres of strongly magnetized neutron stars. The bulk of the energy of the fast mode fuels the development of an electron-positro…
Discovery and study of the accreting pulsar 2RXP J130159.6-635806
Revnivtsev, M.; Lutovinov, A.; Chernyakova, M. +1 more
We report on analysis of the poorly studied source 2RXP J130159.6-635806 at different epochs with ASCA, BeppoSAX, XMM-Newton and INTEGRAL. The source shows coherent X-ray pulsations at a period ~700 s with an average spin-up rate of about . A broad-band (1-60 keV) spectral analysis of 2RXP J130159.6-635806 based on almost simultaneous XMM-Newton a…
Periodic variability during the X-ray decline of 4U 1636-53
Charles, P. A.; Bird, A. J.; Cornelisse, R. +2 more
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the Rossi X-ray Timing Explorer/All Sky Monitor (RXTE/ASM) data of the prototype X-ray burster 4U 1636-53, the X-ray flux of which has been gradually declining over the last 4 yr. This behaviour is remarkably similar to that observed in the neutron star low …
The INTEGRAL spectrometer SPI: performance of point-source data analysis
Knödlseder, J.; von Kienlin, A.; Bouchet, L. +9 more
The performance of the SPI point-source data analysis system is assessed using a combination of simulations and of observations gathered during the first year of INTEGRAL operations. External error estimates are derived by comparing source positions and fluxes obtained from independent analyses. When the source detection significance provided by t…