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dc.contributor.authorCoppin, Kristen
dc.contributor.authorSwinbank, Mark
dc.contributor.authorNeri, Roberto
dc.contributor.authorCox, Pierre
dc.contributor.authorAlexander, Dave
dc.contributor.authorSmail, Ian
dc.contributor.authorPage, Mat
dc.contributor.authorStevens, Jason
dc.contributor.authorKnudsen, Kirsten
dc.contributor.authorIvison, Rob
dc.contributor.authorBeelen, Alexandre
dc.contributor.authorBertoldi, Frank
dc.contributor.authorOmont, Alain
dc.date.accessioned2009-02-04T13:34:42Z
dc.date.available2009-02-04T13:34:42Z
dc.date.issued2008-09
dc.identifier.citationCoppin , K , Swinbank , M , Neri , R , Cox , P , Alexander , D , Smail , I , Page , M , Stevens , J , Knudsen , K , Ivison , R , Beelen , A , Bertoldi , F & Omont , A 2008 , ' Testing the Evolutionary Link Between Submillimetre Galaxies and Quasars : CO Observations of QSOs at z~2 ' , Monthly Notices of the Royal Astronomical Society , vol. 389 , no. 1 , pp. 45-62 . https://doi.org/10.1111/j.1365-2966.2008.13553.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 167632
dc.identifier.otherPURE UUID: 87c1af8b-09f1-4816-b902-96663b606432
dc.identifier.otherdspace: 2299/2870
dc.identifier.otherArXiv: http://arxiv.org/abs/0806.0618v2
dc.identifier.otherScopus: 49549121604
dc.identifier.otherORCID: /0000-0002-0729-2988/work/30423111
dc.identifier.otherORCID: /0000-0002-4010-8310/work/62747597
dc.identifier.urihttp://hdl.handle.net/2299/2870
dc.description‘The definitive version is available at www3.interscience.wiley.com '. Copyright Blackwell Publishing / RAS. DOI: 10.1111/j.1365-2966.2008.13553.x
dc.description.abstractWe have used the IRAM Plateau de Bure mm interferometer and the UKIRT 1-5 um Imager Spectrometer to test the connection between the major phases of spheroid growth and nuclear accretion by mapping CO emission in nine submm-detected QSOs at z=1.7-2.6 with black hole (BH) masses derived from near-infrared spectroscopy. With a previously published QSO, we present sensitive CO(3-2) observations of 10 submm-detected QSOs selected at the epoch of peak activity in both QSOs and submm galaxies (SMGs). CO is detected in 5/6 very optically luminous (M_B~-28) submm-detected QSOs with BH masses M_BH~10^9-10^10 Msun, confirming the presence of large gas reservoirs of M_gas~3.4x10^10 Msun. However, we find that their BH masses are ~30 times too large and their surface density is ~300 times too small to be related to typical SMGs in an evolutionary sequence. Conversely, we measure weaker CO emission in four fainter (M_B~-25) submm-detected QSOs with properties, BH masses (M_BH~5x10^8 Msun), and surface densities similar to SMGs. These QSOs appear to lie near the local M_BH/M_sph relation, making them plausible `transition objects' in the proposed evolutionary sequence linking QSOs to the formation of massive young galaxies and BHs at high-redshift. We show that SMGs have a higher incidence of bimodal CO line profiles than seen in our QSO sample, which we interpret as an effect of their relative inclinations, with the QSOs seen more face-on. Finally, we find that the gas masses of the four fainter submm-detected QSOs imply that their star formation episodes could be sustained for ~10 Myr, and are consistent with representing a phase in the formation of massive galaxies which overlaps a preceding SMG starburst phase, before subsequently evolving into a population of present-day massive ellipticals. [abridged]en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleTesting the Evolutionary Link Between Submillimetre Galaxies and Quasars : CO Observations of QSOs at z~2en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2008.13553.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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