X-ray spectrum of the radio-loud quasar PKS 1217+023.

Abstract

A study of the X-ray (0.1-10 keV) spectrum from the radio-loud quasar, PKS 1217+023 is presented. This quasar was observed with EXOSAT on two epochs in 1984 January 29 and May 14. The data were obtained from the EXOSAT archives. The soft (0.1-2 keV) and hard (2-10 keV) X-ray fluxes have displayed significant changes between the two observations. There is neither a detection of any significant low energy absorption within the quasar nor is there any evidence for the presence of soft X- ray excess. The energy indices, α, of the power law fits to the LE + ME data ofJanuary 29 and May 14 are 0.98^+0.18^_-0.14_ and 0.82^+0.12^_-0.11_ (error bars are with 90% confidence) respectively. The values of a are consistent with the values obtained from Ginga observations but larger than that obtained from Einstein data. A thermal bremsstrahlung model also provides a good fit to the X-ray data of PKS 1217+023.