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GX 1+4: a wonderful Compton reflection dominated spectrum

We report on the longest uninterrupted observation ever carried out of the slow–rotating binary pulsar GX 1+4 . BeppoSAX monitored the ingress and the egress of a low X-ray emission event, covering an energy band of ∼0.1– 200 keV. We found the low–energy pulsation to disappear during the event while the high energy pulsations were shifted in phase of ∼ 0.22 . A broad iron line at ∼ 6.55 keV was present during the high intensity part of the observation on a continuum spectrum well fitted by an absorbed cut-off power law. In the low intensity emission part of the light curve, two narrow iron line emission at ∼ 6.47 keV and ∼ 7.05 keV, were superimposed to a Compton reflection dominated spectrum. The source spin period was Ps ∼ 135 s and the pulse profile highly variable as a function of energy and time during the observation. We discuss all the implications of these new results and we propose a model for the low intensity event occurred in the X-ray light curve. Moreover, we discuss similarities between this source and the recent discovered highly absorbed INTEGRAL sources.