THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 95:1-68, 1994 November

                     ATLAS OF QUASAR ENERGY DISTRIBUTIONS

    MARTIN ELVIS, BELINDA J. WILKES, JONATHAN C. McDOWELL, RICHARD F. GREEN,
    JILL BECHTOLD, S. P. WILLNER, M. S. OEY, ELISHA POLOMSKI, AND ROC CUTRI

                                 ABSTRACT
 
        We present an atlas of the spectral energy distributions (SEDs) of
     normal, nonblazar, quasars over the whole available range (radio to 10
     keV X-rays) of the electromagnetic spectrum.  The primary (UVSX)
     sample includes 47 quasars for which the spectral energy distributions
     include X-ray spectral indices and UV data.  Of these, 29 are radio
     quiet, and 18 are radio loud.  The SEDs are presented both in figures
     and in tabular form, with additional tabular material published on
     CD-ROM.  Previously unpublished observational data for a second set of
     quasars excluded from the primary sample are also tabulated.  The
     effects of host galaxy starlight contamination and foreground
     extinction on the UVSX sample are considered and the sample is used to
     investigate the range of SED properties.  Of course, the properties we
     derive are influenced strongly by the selection effects induced by
     quasar discovery techniques.  We derive the mean energy distribution
     (MED) for radio-loud and radio-quiet objects and present the
     bolometric corrections derived from it.  We note, however, that the
     dispersion about this mean is large (~one decade for both the infrared
     and ultraviolet components when the MED is normalized at the
     near-infrared inflection).  At least part of the dispersion in the
     ultraviolet may be due to time variability, but this is unlikely to be
     important in the infrared.  The existence of such a large dispersion
     indicates that the MED reflects only some of the properties of quasars
     and so should be used only with caution.

     Subject headings: atlases -- galaxies: photometry -- quasars: general