Broad band X-ray properties of GRO J1948+32/KS 1947+300

You are here: Homepage > Search

Broad band X-ray properties of GRO J1948+32/KS 1947+300

Naik, S. / Callanan, P.J. / Paul, B.

AbstractWe present here results obtained from three BeppoSAX observations of the transient X-ray pulsar GRO J1948+32 carried out during the declining phase of its 2000 November–2001 June outburst. Timing analysis of the data clearly shows a 18.7s pulsation in the X-ray light curves in 0.1–100keV energy band. The pulse profile of GRO 1948+32 is characterized by a broad peak with a sharp rise followed by a narrow dip. The dip in the pulse profile shows very strong energy dependence. Phase-averaged spectroscopy obtained with three of the BeppoSAX instruments shows that the 0.1–100keV energy spectrum is described by a Comptonized component, a weak blackbody component (∼7% of the total emission) for soft X-rays, a narrow and weak iron emission line at 6.7keV and low column density of material in the line of sight. The results obtained from the analysis are discussed in this paper.