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We present Karl G. Jansky Very Large Array (VLA) and Atacama Large MillimetreArray (ALMA) observations of SDSS J0924+0219, a z = 1.524 radio-quiet lensedquasar with an intrinsic radio flux density of about 3 micro-Jy. The fourlensed images are clearly detected in the radio continuum and the CO(5-4) line,whose centroid is at z = 1.5254 +/- 0.0001, with a marginal detection in thesubmillimetre continuum. The molecular gas displays ordered motion, in astructure approximately 1--2.5 kpc in physical extent, with typical velocitiesof 50-100 km/s. Our results are consistent with the radio emission beingemitted from the same region, but not with a point source of radio emission.SDSS J0924+0219 shows an extreme anomaly in the flux ratios of the two mergingimages in the optical continuum and broad emission lines, suggesting theinfluence of microlensing by stars in the lensing galaxy. We find the fluxratio in the radio, submillimetre continuum and CO lines to be slightly greaterthan 1 but much less than that in the optical, which can be reproduced with asmooth galaxy mass model and an extended source. Our results, supported by amicrolensing simulation, suggest that the most likely explanation for theoptical flux anomaly is indeed microlensing.

VLA and ALMA observations of the lensed radio-quiet quasar SDSS J0924+0219: a molecular structure in a 3 microJy radio source