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We report the detection of OH 1667‐MHz and wide H  i  21‐cm absorption at  z ∼ 0.67 towards the red quasar 1504 + 377, with the Green Bank Telescope and the Giant Metrewave Radio Telescope. The H  i  21‐cm absorption extends over a velocity range of  ∼600 km s −1   blueward of the quasar redshift  ( z = 0.674) , with the new OH 1667‐MHz absorption component at  ∼ −430 km s −1  , nearly coincident with earlier detections of millimetre‐wave absorption at   z ∼ 0.6715 . The atomic and molecular absorption appear to arise from a fast gas outflow from the quasar, with a mass outflow rate  and a molecular hydrogen fraction . The radio structure of 1504 + 377 is consistent with the outflow arising as a result of a jet–cloud interaction, followed by rapid cooling of the cloud material. The observed ratio of HCO +  and OH column densities is ∼20 times higher than typical values in Galactic and high‐ z  absorbers. This could arise because of small‐scale structure in the outflowing gas on sub‐parsec scales, which would also explain the observed variability in the H  i  21‐cm line.

Outflowing atomic and molecular gas at z ∼ 0.67 towards 1504 + 377