RXTE-PCA observations of XMMU J054134.7-682550

İnam, S.Ç., Townsend, Lee J., McBride, V.A., Baykal, A., Coe, Malcolm J. and Corbet, R.H.D. (2009) RXTE-PCA observations of XMMU J054134.7-682550. Monthly Notices of the Royal Astronomical Society, 395 (3), 1662-1668. (doi:10.1111/j.1365-2966.2009.14659.x).

Abstract

We analysed Rossi X-ray Timing Explorer Proportional Counter Array observations of a recent outburst of the X-ray pulsar XMMU J054134.7?682550. We calculated the pulse frequency history of the source. We found no sign of a binary companion. The source spins up when the X-ray flux is higher, with a correlation between the spin-up rate and X-ray flux, which may be interpreted as a sign of an accretion disc. On the other hand, the source was found to have an almost constant spin frequency when the X-ray flux is lower without any clear sign of a spin-down episode. The decrease in pulsed fraction with decreasing X-ray flux was interpreted as a sign of accretion geometry change, but we did not find any evidence of a transition from accretor to propeller regimes. The source was found to have variable pulse profiles. Two peaks in pulse profiles were usually observed. We studied the X-ray spectral evolution of the source throughout the observation. Pulse-phase-resolved analysis does not provide any further evidence for a cyclotron line, but may suggest a slight variation of intensity and width of the 6.4 keV iron line with phase.

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Contributors

Author: Malcolm J. Coe

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