EXOSAT observations of the quasar PKS 2135 - 147

Details EXOSAT observations of the quasar PKS 2135 - 147 EXOSAT observations of the quasar PKS 2135 - 147

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243...67s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 67-70.

Astronomy and Astrophysics

Astronomy

3

Exosat Satellite, Galactic Nuclei, Quasars, Radiant Flux Density, Satellite Observation, X Ray Spectroscopy, Line Of Sight, Radio Sources (Astronomy), Red Shift, Very Large Array (Vla)

Scientific paper

A study of X-ray emission from the low polarization quasar, PKS 2135 - 147 (PHL 1657), is presented based on the Exosat observations carried out on two occasions separated by a week in 1984. There is little evidence for any variations in the X-ray intensity on hourly time scales during either of the two observations. About 30 percent change in the soft X-ray (0.1-2 keV) intensity is, however, observed over a week. The observed X-ray spectral data is best fitted by a power law with a photon index Gamma of 1.6 + or - 0.4 (error bars are with 90 percent confidence), and a line of sight column density consistent with the 21 cm observations. There is neither a detection of any significant low energy absorption within the quasar nor is there any evidence for soft X-ray excess.

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