we have been conducting the first large spectroscopic campaigns of ssqs (steep-spectrum radioquasars) at the aat, wht and the not, from the mrc and 7c catalogues, currently complete to bj=20.5 (mrc) and r=19.5 (7c). the radio luminosities are orientation independent, free of the biases of beaming and gravitational lensing, and are a factor virgul10 (mrc) and virgul100 (7c) fainter than 3c. an upper limit to quasar radio luminosity p(178mhz) virgul10**28 w.hz-1.sr-1 using omega=1, h0=100 limits 3c to z<2, which is currently the only complete published database of ssqs. also, luminosity and redshift are tightly correlated within single flux-limited samples, so evolutionary effects are indistinguishable from luminosity dependence in 3c. as well as decoupling luminosity and redshift, our surveys chart the relative evolution of ssqs and the rgs (radiogalaxies) from our long term programs based on 6c and 7c at the wht. we have selected 19 (9) z>1.3 ssqs from mrc the autumn (spring) launch and 11 from 7c for the spring only, spanning a comparable range of radio luminosities to the 0.1<z<1.3 gto programs. comparison with coeval rgs srawling_hzrgsr provides a direct test of unified schemes, and informs on the molecular torus geometry. the latter is subject to the additional constraints imposed by the relative changes in ssq/rg space density; by comparing with lower-z ssqs (gto) we test for evolution both in torus properties and in star formation rates within the host galaxies.
Instrument
PHT22
Temporal Coverage
1997-01-04T10:13:08Z/1998-01-20T01:53:31Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds 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.
