Chandra Observations of Fast Spinning Hard Transients in Quiescence: Probing the Spectrum Deep in the Propeller Regime

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Chandra Proposal Id #02400498

Scientific paper

We propose Chandra observations of five HXRTs containing fast spinning and/or high magnetic field neutron stars to probe their quiescent emission. Due to their faintness these sources are likely in an accretion regime which does not allow matter to fall directly onto the neutron star surface (propeller state). Indeed, we have already carried out BeppoSAX observations onsome of these sources with promising results as the dramatic increase in the X-ray luminosity by a factor of 100 in 15 hr in 4U 0115+63, interpreted as the overcome of the centrifugal barrier. The selected sample allows us to probe the physics of the propeller in a variaty of conditions (P=69 ms-103 s / B=10^11-10^13 G), and in a range of luminosities unaccessible to previous X-ray missions.

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