Exploring the Full Range of Quasar/AGN Properties

scientific abstract we plan to obtain spectrophotometry with iso to complete multiwavelength observations (180 microns 2 kev) of a sample of quasars which, when combined with that included in the european core program, will fully sample the quasar population as we know it. due to their broad bandwidth emission, complete spectral coverage of the continuum is essential to understanding the energy deneration mechanisms at work in these powerful objects. such data is currently available only for lowredshift objects. with these data we will measure the spectral energy distributions of the population, search for evolutionary effects and address specific issues such as the nature of the farir turnover and the relative importance of thermal and nonthermal emission in the infrared. our sample contains a substantial overlap with quasars scheduled for observation with rosat so as to include xray information as far as possible. observation summary filters and aots: the 3180 micron continuum of the quasars will be observed using photp and photc, aots phot03 and phot22 respectively. these filter include: p03: 4.85, 7.3, 11.5, 25, 60, 100; and p22: 160 (or 135 and 200 for the brightest objects); giving 7/8 photometric points covering the full range of available spectrum. exposure times: the exposure times have been computed to obtain s/n of about 10 in each filter and so vary from object to object. the minimum is 16 secs on source and 16 secs off for a given filter and the maximum 256 and 256 secs. for those objects where a few filters reach the maximum exposure time, the s/n will likely be <10 for those filters. flux estimation: fluxes in the farir have been estimated based upon a mean spectral energy distribution for quasars at low redshift which extends to 100 microns. it is based upon 47 lowredshift quasars and is in press in apj supplements (elvis etal 1994). beyond 100 microns, where truncated!, [truncated!, Please see actual data for full text]