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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 4(426), p. 3201-3210

DOI: 10.1111/j.1365-2966.2012.21941.x

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The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs atz ∼ 2.5

Journal article published in 2012 by J. M. Simpson, Ian Smail, A. M. Swinbank, D. M. Alexander, R. Auld, M. Baes, D. G. Bonfield, D. L. Clements, A. Cooray, K. E. K. Coppin, A. L. R. Danielson, A. Dariush, L. Dunne, G. de Zotti, C. M. Harrison and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

We present Institut de Radioastronomie Millimetrique Plateau de Bure Interferometer observations of the (CO)-C-12(32) emission from two far-infrared luminous QSOs at z similar to 2.5 selected from the Herschel-Astrophysical Tetrahertz Large Area Survey. These far-infrared bright QSOs were selected to have supermassive black holes (SMBHs) with masses similar to those thought to reside in submillimetre galaxies (SMGs) at z similar to 2.5, making them ideal candidates as systems in the potential transition from an ultraluminous infrared galaxy phase to a submillimetre faint, unobscured, QSO. We detect (CO)-C-12(32) emission from both QSOs and we compare their baryonic, dynamical and SMBH masses to those of SMGs at the same epoch. We find that these far-infrared bright QSOs have similar dynamical but lower gas masses than SMGs. We combine our results with literature values and find that at a fixed LFIR, far-infrared bright QSOs have similar to 50 +/- 30 per cent less warm/dense gas than SMGs. Taken together with previous results, which show that QSOs lack the extended, cool reservoir of gas seen in SMGs, this suggests that far-infrared bright QSOs are at a different evolutionary stage. This is consistent with the hypothesis that far-infrared bright QSOs represent a short (similar to 1Myr) but ubiquitous phase in the transformation of dust-obscured, gas-rich, starburst-dominated SMGs into unobscured, gas-poor, QSOs.