Quasar energy distributions. I - Soft X-ray spectra of quasars

Details Quasar energy distributions. I - Soft X-ray spectra of quasars Quasar energy distributions. I - Soft X-ray spectra of quasars

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..243w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 243-262.

Astronomy and Astrophysics

Astrophysics

365

Astronomical Spectroscopy, Quasars, Spectral Energy Distribution, X Ray Spectra, Bl Lacertae Objects, Radio Spectra, Red Shift, Stellar Luminosity

Scientific paper

As 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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