Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339...27c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 1, 1989, p. 27-38.
Astronomy and Astrophysics
Astrophysics
65
Quasars, Red Shift, X Ray Spectra, Absorption Spectra, Heao 2, Luminosity, Proportional Counters, Radio Spectra
Scientific paper
The X-ray spectra of high-redshift QSOs are examined here using data from the Imaging Proportional Counter on the Einstein Observatory. The objects are grouped into ensembles according to radio properties, redshift, and luminosity, and their mean spectral parameters are determined. A clear correlation is found between radio properties and the energy power law index alpha. Flat radio spectrum (FRS) QSOs have alpha of about 0.4, steep radio spectrum (SRS) QSOs have alpha of about 0.7, and radio-quiet QSOs have alpha of about 1-1.4. There is no evidence for a dependence of alpha on z or, for the FRS and SRS ensembles, on X-ray luminosity over nearly three decades. FRS QSOs with z between 2.0 and 3.5 have just as flat mean spectra as those with low z, implying that a single power law, which is flatter than the canonical one with alpha of about 0.65, continues into the 1-10 keV band.
Canizares Claude R.
White Julia L.
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