Martin Durant

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The detection of optical/infrared counterparts to Anomalous X-ray Pulsars (AXPs) has greatly increased our understanding of these systems. Models for the AXP phenomenon were based upon their X-ray emission, and all but the magnetar model made predictions for the optical/infrared that have now been falsified. With detections in hand, detailed studies of the(More)
Feroci, M.; den Herder, J. W.; Bozzo, E.; Barrett, D.; Brandt, S.; Hernanz, M.; van der Klis, M.; Pohl, M.; Santangelo, A.; Stella, L.; Watts, A.; Wilms, J.; Zane, S.; Ahangarianabhari, M.; Alpar, A.; Altamirano, D.; Alvarez, L.; Amati, L.; Amoros, C.; Andersson, N.; Antonelli, A.; Argan, A.; Artigue, R.; Azzarello, P.; Baldazzi, G.; Balman, S.; Barbera,(More)
The vast majority of known nonaccreting neutron stars (NSs) are rotation-powered radio and/or γ-ray pulsars. So far, their multiwavelength spectra have all been described satisfactorily by thermal and nonthermal continuum models, with no spectral lines. Spectral features have, however, been found in a handful of exotic NSs and were thought to be a(More)
Results of observations of the Galactic bulge X-ray source GX 9+9 by the All-Sky Monitor (ASM) and Proportional Counter Array (PCA) onboard the Rossi X-ray Timing Explorer are presented. The ASM results show that the 4.19 hour X-ray periodicity first reported by Hertz and Wood in 1987 was weak or not detected for most of the mission prior to late 2004, but(More)
Multi-colour (JHKS) imaging and photometry of the field of the Anomalous X-ray Pulsar AXP 1E 1841−045 is analysed in the light of new, accurate coordinates from Chandra (Wachter et al, 2004). From excellent quality images, we find multiple sources in and around the position error circle. Of these, none can be confidently identified as the infrared(More)
The Large Observatory For x-ray Timing (LOFT) is a mission concept which was proposed to ESA as M3 and M4 candidate in the framework of the Cosmic Vision 2015-2025 program. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument and the uniquely large field of view of its wide field monitor, LOFT will be able(More)
We have collected data spanning seven years of observations of the magnetar 4U 0142+61 in the infrared, optical and soft X-rays. These combine our own observations and analysis of archival data. We find that the source is variable in the optical, in contrast to what had been previously reported, that the K-band flux can vary by over a magnitude on the(More)