2011MNRAS.414.1023D

We report a detailed timing and spectral analysis of Rossi X-ray Timing Explorer Proportional Counter Array (RXTE-PCA) data obtained from observations during the outburst of a transient X-ray pulsar 1A 1118-61 in 2009 January. The pulse profile showed significant evolution during the outburst and also significant energy dependence – a double-peaked profile up to 10 keV and a single peak at higher energy. We have also detected quasi-periodic oscillations (QPOs) at 0.07–0.09 Hz. The rms value of the QPO is 5.2 per cent, and it shows a significant energy dependence with highest rms of 7 per cent at 9 keV. The QPO frequency changed from 0.09 to 0.07 Hz within 10 d. The magnetic field strength calculated using the QPO frequency and the X-ray luminosity is in agreement with the magnetic field strength measured from the energy of the cyclotron absorption feature detected in this source. The 3–30 keV energy spectrum over the 2009 outburst of 1A 1118-61 can be well fitted with a partial covering power-law model with a high-energy cut-off and an iron fluorescence line emission. The pulse phase resolved spectral analysis shows that the partial covering and high-energy cut-off model parameters have significant changes with the pulse phase.