Serendipitous discovery of a redshift 4.4 QSO

Details Serendipitous discovery of a redshift 4.4 QSO Serendipitous discovery of a redshift 4.4 QSO

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328l..29m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 328, May 15, 1988, p. L29-L33. Research supported by the Universi

Astronomy and Astrophysics

Astrophysics

38

Emission Spectra, Lyman Alpha Radiation, Quasars, Red Shift, Line Spectra, Radio Galaxies

Scientific paper

The authors report the serendipitous discovery of an extremely high-redshift quasar (QSO), designated Q2203+29. It was found during long-slit observations of the radio galaxy 3C 441. The QSO spectrum contains strong emission lines of Lyα, N V λ1240, and C IV λ1549, as well as weaker Lyβ, O VI λ1034, Si II λ1262, and Si IV/O IV] λ1400. There is a prominent break in the continuum level blueward of Lyα. The derived redshift is 4.406±0.005. Deep broad-band imaging reveals no resolved structure. The r magnitude of the QSO is 20.8. The broad-band images show a faint disk galaxy with z = 0.2, located 7arcsec away from the QSO. Spectra do not exhibit any absorption lines produced by this foreground galaxy.

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