The quasar 1821+643 during the ROSAT survey

Details The quasar 1821+643 during the ROSAT survey The quasar 1821+643 during the ROSAT survey

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..169u&link_type=abstract

In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 169-174 (SEE

Astronomy and Astrophysics

Astronomy

1

Iue, Quasars, Rosat Mission, Sky Surveys (Astronomy), Ultraviolet Spectra, X Ray Spectra, Light Curve, Proportional Counters, Radiant Flux Density, Variability, X Ray Telescopes

Scientific paper

Observations of the nearby intrinsically bright quasar 1821 + 643 situated at 86 deg. ecliptic latitude, for 37 days by the X-ray Telescope/Position Sensitive Proportional Counter (XRT/PSPC) during the Rosat all sky survey and with IUE on 7 days almost evenly spaced during Rosat visibility period are reported. Both the X-ray and the UV flux remained constant within the measurement errors during that period. The spectrum obtained by adding all the photons can be well fitted with a model comprising a power law with Gamma approximately -1.80, NH fixed to the galactic value of 4.09 times 10 to the 20th power/sq cm and a soft excess component. From a statistical viewpoint the fits of the soft excess by a black body, by a thermal bremsstrahlung or by a step power law are equally acceptable.

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