PKS 1251-407: a radio-loud quasar at z=4.46

Details PKS 1251-407: a radio-loud quasar at z=4.46 PKS 1251-407: a radio-loud quasar at z=4.46

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278l..11s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 278, Issue 1, pp. L11-L15.

Astronomy and Astrophysics

Astronomy

18

Quasars: General, Quasars: Individual: Pks 1251-407

Scientific paper

During the course of a search for z<~5 radio-loud quasars, the radio source PKS 1251-407 was found to be identified with a quasar at z=4.46. This is the highest redshift radio-loud quasar found to date, and one of only two at z<~4. It has B and Gunn-i magnitudes of m_B=23.7 and m_i=19.9, and a flux density at 2.7 GHz of 0.25 Jy. The corresponding luminosities are typical of radio-loud quasars at lower redshifts. The Lyalpha, NV and CIV emission lines are exceptionally narrow, even for the class of narrow-line QSOs. It is likely that PKS 1251-407 is the highest redshift quasar in the parent sample of 896 flat-spectrum Parkes sources, and this would be consistent with a fall-off in the space density of such objects at high redshifts.

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