We present IRAM Plateau de Bure Interferometer observations of the 12CO(3-2) emission from two far-infrared luminous QSOs at z ~ 2.5 selected from the Herschel-ATLAS survey. These far-infrared bright QSOs were selected to have supermassive black holes (SMBHs) with masses similar to those thought to reside in sub-millimetre galaxies (SMGs) at z ~ 2.5; making them ideal candidates as systems in transition from an ultraluminous infrared galaxy phase to a sub-mm faint, unobscured, QSO. We detect 12CO(3-2) 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. In particular we find that far-infrared bright QSOs have ~50+-23% less warm/dense gas than SMGs, which combined with previous results showing the QSOs lack the extended, cool reservoir of gas seen in SMGs, suggests that they are at a different evolutionary stage. This is consistent with the hypothesis that far-infrared bright QSOs represent a short (~1Myr) but ubiquitous phase in the transformation of dust obscured, gas-rich, starburst-dominated SMGs into unobscured, gas-poor, QSOs.

The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs at z ~ 2.5 / Simpson, J. M.; Smail, I; Swinbank, A. M.; Alexander, D. M.; Auld, R; Baes, M; Bonfield, D. G.; Clements, D. L.; Cooray, A; Coppin, K. E. K.; Danielson, A. L. R.; Dariush, A; Dunne, L; de Zotti, G; Harrison, C. M.; Hopwood, R; Hoyos, C; Ibar, E; Ivison, R. J.; Jarvis, M. J.; Lapi, Andrea; Maddox, S. J.; Page, M. J.; Riechers, D. A.; Valiante, E; van der Werf, P. P.. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 426:4(2012), pp. 3201-3210. [10.1111/j.1365-2966.2012.21941.x]

The evolutionary connection between QSOs and SMGs: molecular gas in far-infrared luminous QSOs at z ~ 2.5

Lapi, Andrea;
2012-01-01

Abstract

We present IRAM Plateau de Bure Interferometer observations of the 12CO(3-2) emission from two far-infrared luminous QSOs at z ~ 2.5 selected from the Herschel-ATLAS survey. These far-infrared bright QSOs were selected to have supermassive black holes (SMBHs) with masses similar to those thought to reside in sub-millimetre galaxies (SMGs) at z ~ 2.5; making them ideal candidates as systems in transition from an ultraluminous infrared galaxy phase to a sub-mm faint, unobscured, QSO. We detect 12CO(3-2) 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. In particular we find that far-infrared bright QSOs have ~50+-23% less warm/dense gas than SMGs, which combined with previous results showing the QSOs lack the extended, cool reservoir of gas seen in SMGs, suggests that they are at a different evolutionary stage. This is consistent with the hypothesis that far-infrared bright QSOs represent a short (~1Myr) but ubiquitous phase in the transformation of dust obscured, gas-rich, starburst-dominated SMGs into unobscured, gas-poor, QSOs.
2012
426
4
3201
3210
https://academic.oup.com/mnras/article/426/4/3201/1017252
Simpson, J. M.; Smail, I; Swinbank, A. M.; Alexander, D. M.; Auld, R; Baes, M; Bonfield, D. G.; Clements, D. L.; Cooray, A; Coppin, K. E. K.; Danielson, A. L. R.; Dariush, A; Dunne, L; de Zotti, G; Harrison, C. M.; Hopwood, R; Hoyos, C; Ibar, E; Ivison, R. J.; Jarvis, M. J.; Lapi, Andrea; Maddox, S. J.; Page, M. J.; Riechers, D. A.; Valiante, E; van der Werf, P. P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/17121
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