Abstract
IN January 1977 the radio source AO0827+24 (ref. 1) was observed at 90 GHz by F. Owen, S. Mufson, R. Porcas and T. Moffett with the NRAO 36-foot antenna at Kitt Peak, during observations of several flat spectrum sources selected from the Green Bank 5-Ghz survey2. Among these sources, 34, including AO0827+24, were found to have flux densities greater than 1 Jy at 90 GHz. Spectrographic observations of the optical counterparts of these 34 sources are in progress. We report here observations of the Mg(II) and Fe(II) absorption line system, at a redshift z = 0.525, in the optical spectrum of the 17.5-mag stellar object associated with AO0827+24 because of the similarity with the absorption line system of the two BL Lacertae objects PKS0735+178 (ref. 3) and AO0235+164 (ref. 4) which also have flat radio spectra.
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ULRICH, MH., OWEN, F. Absorption lines in the optical spectrum of quasar AO0827+24. Nature 269, 673–674 (1977). https://doi.org/10.1038/269673a0
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DOI: https://doi.org/10.1038/269673a0
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