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- W14799274 abstract "We discuss results from a large completed project which takes advantage of the characteristics of compact, high-power radio-loud QSOs identified by Ken Kellermann early in his career. We set out to (i) search for high-redshift radio-loud QSOs and (ii) study the evolution of the flat-spectrum QSO population. Following a 6 yr campaign we have obtained accurate radio positions and optical data for a large sample of Parkes flat-spectrum radio sources. The resultant sample enables us to trace the space density turnover of flat-spectrum QSOs. We conclude that there is a space density turnover in the QSO population and that optically-selected QSO samples are little affected by dust obscuration. 1. High-redshift QSOs and the RLF Since the first identification of the spectral features of the radio-loud QSO 3C 273, bright QSOs have been targeted in the quest to find the highest-redshift object in the Universe. Historically, the blue-ribbon for QSO redshifts was long held by radio-loud sources. This bias was due to a large fraction of radio-bright (S178 MHz > 10 Jy) sources lying at high redshift, as evidenced by the redshift distribution for the Cambridge 3C sample and known to be due to a strong evolution in the powerful radio source population. (Longair 1966). More recently optical color selection techniques and narrow-band Lyα searches have proved highly successful in detecting the highest-redshift objects: The current record-" @default.
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- W14799274 date "2003-01-01" @default.
- W14799274 modified "2023-09-26" @default.
- W14799274 title "High-Redshift Radio-Loud QSOs: Unification and the Space Density Turnover" @default.
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