Abstract
A sample of 25 QSOs is used to investigate the average spectrum between
the soft X-ray energy band of the Einstein Observatory Image
Proportional Counter, and the higher energy band of the HEAO 1 A-2
experiment. Assuming a power-law spectrum, a 90 percent confidence range
is found for alpha(F(v) approximately v to the -alpha of 0.83 (+0.32,
-0.22) for N(H) lower than 3 x 10 to the 20th atoms/sq cm. Higher column
densities for QSOs are not anticipated, but if N(H) were about 10 to the
22nd atoms/sq cm, then alpha would be greater then 0.97. The present
spectrum is similar to those exhibited by Seyfert galaxies and narrow
emission line galaxies above 2 keV. The spectrum is soft enough that, if
these objects are typical of the higher redshift, more radio-quiet QSOs,
then QSOs can be excluded as being the dominant origin of the diffuse
X-ray background.
Original language | English |
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Pages (from-to) | 434-439 |
Journal | Astrophysical Journal |
Volume | 276 |
Publication status | Published - 1 Jan 1984 |
Keywords
- Quasars
- X Ray Sources
- Broadband
- Energy Spectra
- Heao 1
- Heao 2
- Seyfert Galaxies
- Spectrum Analysis
- X Ray Spectra