Figure 1. HATLAS J (z = 2. 372, marked with vertical line)

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Figure 1. HATLAS J090426.9+015448 (z = 2.372, marked with vertical line). Left-hand panel: the ATCA-detected radio continuum emission from HATLAS J090426.9+015448. The grey-scale shows the 1.4-GHz FIRST detection and the contours show the ATCA-detected radio emission (SNR = 14) at 34.44 GHz (115-GHz rest frame). Contour levels are 22 × (1, $\sqrt{2}$, 2, 2$\sqrt{2}$, 4) μJy beam<sup>−1</sup>. There is a single negative contour at −22 μJy beam<sup>−1</sup>. The 1σ background noise level in the ATCA map is 14 μJy beam<sup>−1</sup>. The extended feature to the west of the peak is not believed to be significant, a result of residual phase errors. The restoring beam used following deconvolution is a Gaussian with a major axis of 19 arcsec, a minor axis of 15 arcsec and a position angle of −57° east of north, as indicated by the ellipse in the lower left. Right-hand panel: histogram showing the CO (J = 1 → 0) spectrum of HATLAS J090426.9+015448. The vertical line is the Ly α redshift (Virdee 2013) and the velocity of the molecular gas with respect to this is shown on the panel. The solid lines show the two Gaussian components fitted to the peaks as described in Section 4.4. The 1σ image noise values, measured in each plane of the image cube over the channels shown above, has a mean value of 0.21 mJy beam<sup>−1</sup> with a standard deviation of 0.02 mJy beam<sup>−1</sup>. The noise in the plotted spectrum appears considerably lower due to the effects of the Hanning smoothing. From: ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies Mon Not R Astron Soc. 2016;465(2):1297-1307. doi:10.1093/mnras/stw2774 Mon Not R Astron Soc | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Figure 2. HATLAS J140930.4+003803 (z = 2.044, marked with vertical line). Left-hand panel: the ATCA-detected radio continuum emission from HATLAS J140930.4+003803. Grey-scale and contours are as per Fig. 1. The 38.124-GHz (115-GHz rest-frame) ATCA detection has an SNR of 18. Contour levels are 20 × (1, $\sqrt{2}$, 2, 2$\sqrt{2}$, 4, 4$\sqrt{2}$, 8) μJy beam<sup>−1</sup>, with a single negative contour at −16 μJy beam<sup>−1</sup>. The 1σ noise level in the ATCA map is 16 μJy beam<sup>−1</sup>. The restoring beam has a major axis of 16 arcsec, a minor axis of 14 arcsec and a position angle of −82° east of north, as shown in the lower left. Right-hand panel: histogram showing the CO (J = 1 → 0) spectrum of HATLAS J140930.4+003803. The vertical line is the Ly α redshift (Virdee 2013). Properties of the two Gaussian components fitted to the peaks are described in Section 4.4. The 1σ image noise values, measured in each plane of the image cube over the channels shown above, has a mean value of 0.22 mJy beam<sup>−1</sup> with a standard deviation of 0.02 mJy beam<sup>−1</sup>. Again, the Hanning smoothing makes the noise in the plotted spectrum appear much lower. From: ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies Mon Not R Astron Soc. 2016;465(2):1297-1307. doi:10.1093/mnras/stw2774 Mon Not R Astron Soc | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Figure 3. Radio continuum spectra of HATLAS J090426 Figure 3. Radio continuum spectra of HATLAS J090426.9+015448 and HATLAS J140930.4+003803. In increasing frequency order, the measurements are from the 325-MHz GMRT survey of Mauch et al. (2013), the 1.4-GHz NVSS survey (Condon et al. 1998) and this work. From: ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies Mon Not R Astron Soc. 2016;465(2):1297-1307. doi:10.1093/mnras/stw2774 Mon Not R Astron Soc | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Figure 5. Star formation efficiency (L<sub>FIR</sub>/$L^{\prime }_{\mathrm{CO}}$) against FIR luminosity (L<sub>FIR</sub>) for HATLAS J090426.9+015448 and HATLAS J140930.4+003803 (labelled crosses showing the uncertainties in the two parameters). Additional points are as per Fig. 4. From: ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies Mon Not R Astron Soc. 2016;465(2):1297-1307. doi:10.1093/mnras/stw2774 Mon Not R Astron Soc | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Figure 4. FIR luminosity (L<sub>FIR</sub>) against CO luminosity ($L^{\prime }_{\mathrm{CO}}$) for HATLAS J090426.9+015448 and HATLAS J140930.4+003803 (labelled crosses showing the uncertainties in the two parameters), in the context of a range of sources. A sample of CO-detected radio galaxies (RGs) is shown, as well as spiral galaxies, luminous infrared galaxies (LIRGs), ultraluminous infrared galaxies (ULIRGs), Lyman-break galaxies (LBGs), sub-millimetre galaxies (SMGs) and quasars (QSOs). The diagonal line shows the fit to the SMG and ULIRG population by Bothwell et al. (2013). Measurements in this plot are from various studies as collated by Heywood et al. (2013), and include additional HzRG points from Emonts et al. (2014). From: ATCA detections of massive molecular gas reservoirs in dusty, high-z radio galaxies Mon Not R Astron Soc. 2016;465(2):1297-1307. doi:10.1093/mnras/stw2774 Mon Not R Astron Soc | © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society