Do quasars with radio spectra peaked at gigahertz frequencies have extremely high redshifts?

Details Do quasars with radio spectra peaked at gigahertz frequencies have extremely high redshifts? Do quasars with radio spectra peaked at gigahertz frequencies have extremely high redshifts?

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245p..20o&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 1, 1990, p. 20P-23P.

Astronomy and Astrophysics

Astronomy

24

Quasars, Radio Spectra, Red Shift, Spectral Energy Distribution, Cosmology, Galactic Evolution, Star Formation, Ultrahigh Frequencies

Scientific paper

Quasars with simple convex radio spectra peaked near 1 GHz, or gigahertz-peaked spectrum (GPS) quasars, are examined, focusing on the question of wheter or not GPS quasars are more frequent at ultra-high redshifts. It is found that about half of all ultra-high redshift (z greater than 3) quasars are GPS sources and about half of all GPS quasars are a ultra-high z. This results is used to discuss the possibility of using GPS quasars to detect ultra-high z quasars.

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