Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252...53g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 53-55.
Astronomy and Astrophysics
Astronomy
3
Quasars, Radio Sources (Astronomy), X Ray Spectra, Active Galactic Nuclei, Exosat Satellite, Extragalactic Radio Sources
Scientific paper
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 January 29 and May 14, 1984. 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, alpha, of the power law fits to the LE + ME data of January 29 and May 14 are 0.98+0.18/-0.14 and 0.82+0.12/-0.11 (error bars are with 90 percent confidence), respectively. The values of alpha 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.
Ghosh Kajal K.
Soundararajaperumal S.
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