Quasar energy distributions. I - Soft X-ray spectra of quasars
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CitationWilkes, Belinda J., and Martin Elvis. 1987. “Quasar Energy Distributions. I - Soft X-Ray Spectra of Quasars.” The Astrophysical Journal 323 (December): 243. doi:10.1086/165822.
AbstractAs the initial stage of a study of quasar energy distributions (QEDs), Einstein IPC spectra of 24 quasars are presented. These are combined with previously reported IPC spectra to form a sample of 33 quasars with well-determined soft X-ray slopes. A correlation analysis shows that radio loudness, rather than redshift or luminosity, is fundamentally related to the X-ray slope. This correlation is not followed by higher energy spectra of active galaxies. Two components are required to explain both sets of results. The best-fit column densities are systematically smaller than the Galactic values. The same effect is not present in a sample of BL Lac objects, implying that the effect is intrinsic to the quasars and is caused by a low-energy turnup in the quasar spectra.
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