X-Ray Spectra of PG Quasars. I. The Continuum from X-Rays to the Infrared
Elvis, Martin; Green, Richard F.; Bechtold, Jill; Fabbiano, G.; Matthews, K.; Soifer, B. T.; Neugebauer, G.; Schmidt, Maarten
United States
Abstract
Einstein IPC X-ray spectra for a sample of eight optically selected quasars from the Palomar Bright Quasar survey are presented. The quasars have a mean power law energy slope which in five individual cases is inconsistent with the value found in hard X-ray selection criterion rather than luminosity, redshift, or U-B color. New IUE and optical continuum spectra and infrared photometry are presented for these quasars. The data are combined into log vf(v) and log v distributions which support the decomposition of the overall quasar spectrum into a power law plus a superposed optical-UV 'big bump' which may be due to an accretion disk. At least six of the quasars have vf(v)s which are roughly constant between their infrared and X-ray power laws, suggesting a strong link between the two regions.