Discovery of radio-loud quasars with redshifts above 4 from the PMN sample

We present results of a new, large survey for high-redshift radio-loud quasars, which targets quasars with $z>4$. The survey is based on the PMN and NVSS radio surveys, optically identified using digitised UKST B, R and I plates. Six new $z>4$ flat-spectrum QSOs have been discovered, and one p...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2002-08, Vol.391 (2), p.509-517
Main Authors: Hook, I. M., McMahon, R. G., Shaver, P. A., Snellen, I. A. G.
Format: Article
Language:English
Subjects:
quasars: general
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Summary:We present results of a new, large survey for high-redshift radio-loud quasars, which targets quasars with $z>4$. The survey is based on the PMN and NVSS radio surveys, optically identified using digitised UKST B, R and I plates. Six new $z>4$ flat-spectrum QSOs have been discovered, and one previously known $z>4$ QSO rediscovered, based on their red optical colours. The QSOs discovered in this survey are bright in both radio and optical bands; in particular PMN J1451-1512 ($z=4.763$, $\rm I=17.3$, $R=19.1$) and PMN J0324-2918 ($z=4.630$, $R=18.7$) are very luminous. PMN J1451-1512 at $z=4.763$ is also now the most distant radio-selected quasar. In addition, 9 new quasars with $3.5
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20020869