ROSAT X ray spectra of quasars with a range of continuum properties and redshift

Details ROSAT X ray spectra of quasars with a range of continuum properties and redshift ROSAT X ray spectra of quasars with a range of continuum properties and redshift

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..210w&link_type=abstract

In MPI für Extraterristrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 210-215 (SEE

Astronomy and Astrophysics

Astronomy

1

Quasars, Red Shift, Rosat Mission, Spectrum Analysis, X Ray Spectra, Absorption Spectra, Luminosity, Proportional Counters, Wavelengths, X Ray Astronomy

Scientific paper

Soft x-ray spectral observations of three targeted and two serendipitous quasars with the Rosat Position Sensitive Proportional Counter (PSPC) are reported. These quasars were observed as part of a program to observe objects covering the full range of the quasar population to study the range and evolution of their x-ray spectra and eventually their full wavelength distributions. The inital sample included three radio loud, all with z greater than 0.5 and two low redshift, radio quiet quasars, one with a known excess from Einstein observations. The highest redshift object (PKS0438-43, z = 2.85) is the first high luminosity quasar to show a significant absorbing column in excess of the Galactic value and calls into question the inverse absorption/luminosity correlation found at low redshift. Only two of the three radio loud quasars follow the Einstein observed correlation between x-ray slope and core dominance parameter.

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