RXTE-PCA observations of 1A 1118−61: timing and spectral studies during an outburst

摘要: 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 transient pulsar 1A 1118−61 in 2009 January. The pulse profile showed significant evolution also energy dependence – double-peaked up to 10 keV single peak at higher energy. have detected quasi-periodic oscillations (QPOs) 0.07–0.09 Hz. rms value QPO is 5.2 per cent, it shows with highest 7 cent 9 keV. frequency changed 0.09 to 0.07 Hz within 10 d. magnetic field strength calculated using luminosity agreement measured cyclotron absorption feature this source. 3–30 keV spectrum over can be well fitted partial covering power-law model high-energy cut-off an iron fluorescence line emission. phase resolved that parameters changes phase.