Elvis, MartinWilkes, BelindaTananbaum, Harvey2017-06-081985Elvis, M., B. J. Wilkes, and H. Tananbaum. 1985. “The Diversity of Soft X-Ray Spectra in Quasars.” The Astrophysical Journal 292 (May): 357. doi:10.1086/163166.0004-637Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:32955251Soft X-ray spectra for three quasars obtained with the Einstein Imaging Proportional Counter covering the 0.1-4.0 keV band are reported. Power-law fits to these spectra have best-fit energy indices of 1.2 +0.6 or -0.2, for the quasar NAB 0205 + 024, 0.6 +0.3 or -0.2 for the quasar B2 1028 + 313, and 2.2 + or -0.4 for the quasar PG 1211 + 143. None of the quasars shows any evidence for a column density of cold matter in excess of the galactic values. The derived spectra demonstrate that there is no single universal power law slope for quasar X-ray spectra. The implications of these results for the X-ray background, X-ray continuum emission mechanisms, and the production of the optical/UV emission lines are briefly discussed.en-USquasarsradiation mechanismsX-rays: sourcesJournal Article2017-02-0819852017-06-0810.1086/163166