Abstract
The quasar, Q0420–388, (Z = 3.12, m = 16.9, ref. 1) was detected at a wavelength of 1 mm during part of a programme of 1-mm observations of optically selected (m < 17.5) quasars2. We observed a strongly inverted spectrum and confirm the high luminosity3. The observations support the explanation of the radio-quiet quasar phenomenon as being due to very compact structures which are self-absorbed even at short centimetre wavelengths.
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