= > this proposal requests an upgrade from priority 3 for prop_b_a.pandrean = we propose to use phot to carry out measurements at wavelengths of 11.5, 60 and 160um of a complete sub-sample of optically selected bright quasars taken from two recently completed multicolour (u,b,v,r,i) quasar surveys. the optical fluxes are in the range 15 < b < 17, partially overlapping those of the pg survey, but with a much better photometric accuracy (sigma_b virgul 0.1mag). our samples show that the true surface density of optically-selected quasars in the range 15<b<16.5 is significantly higher (a factor 3) with respect to the pg survey. no other complete quasar surveys sample such bright fluxes. rosat and vla observations were already obtained for whole bright sub-sample. with our new estimation of the b-band space density of quasars, our main aim is to estimate, for the first time, the bivariate luminosity function. this will tell us how the optical-infrared relation for quasars changes as a function of both luminosity and redshift. using this relation we can derive the relative strengths of the different components responsible for infrared emission and disentangle the dependences on redshift and luminosity. note that this project cannot be carried out using iras data because of the low sensitivity of this survey and the lack of any complete quasar sample observed by this satellite. photometry at different fir wavelengths will measure the spectral energy distribution (sed) of the population and address the issues of the relative importance of thermal and non-thermal emission. the inference of the amount of dust in these objects will have profound impact onto the question of the host galaxy formation. only 6 sources are in the reserved list of iso-phot and her...e we propose to upgrade those aots concerning the remaining 26 objects with bmag<16.7 to build a homogeneous sample at this magnitude. only in this way, significant statistics can be obtained to achieve the scientific aims of this project.
Instrument
PHT22
Temporal Coverage
1997-05-08T15:44:40Z/1997-12-03T22:10:29Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the world's first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, 1999, Fir Photometry Of A Complete Sample Of Optically Selected Bright Quasars., 1.0, European Space Agency, https://doi.org/10.5270/esa-tpmg14w
