The Optical and Radio Spectrum of the Radio-Selected High Redshift Quasar S4:1745+624

Details The Optical and Radio Spectrum of the Radio-Selected High Redshift Quasar S4:1745+624 The Optical and Radio Spectrum of the Radio-Selected High Redshift Quasar S4:1745+624

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275...49s&link_type=abstract

Astronomy and Astrophysics, Vol.275, NO. 1/AUG(I), P. 49, 1993

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

The optical and radio spectrum as well as direct imaging data for the strong radio source S4 1745+624, a high redshift quasar with z = 3.886, are presented. The optical continuum redward of Lyman α is rather steep with a spectral index of α = - 1.3 and the continuum depression blueward of the Lyman α λ1216 emission line is smaller than in optically selected quasars of similar redshift. The overall radio spectrum differs markedly from that of other high redshift radio quasars, showing a steep low frequency part and a flat high frequency part.

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