Abstract
RADIO spectra for the highly redshifted z ≥ 3.40 quasars OH471 (ref. 1) and OQ172 (ref. 2) are presented here for frequencies between 16.7 MHz and 85.3 GHz. The spectra are complex. Both have a peak at or near 1.4 GHz and a second peak near or above 85 GHz. Both have a low frequency cutoff, the one for OH471 being especially sharp. OH471 sometimes seems to be variable at 31 GHz on a time scale of days but the source appears to be stable at 10.7 and 22 GHz.
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GEARHART, M., KRAUS, J., ANDREW, B. et al. Radio spectra of OH471 and OQ172. Nature 249, 743–746 (1974). https://doi.org/10.1038/249743a0
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DOI: https://doi.org/10.1038/249743a0
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