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dc.contributor.authorAlexander, D.M.
dc.contributor.authorBrandt, W.N.
dc.contributor.authorSmail, I.
dc.contributor.authorSwinbank, A.M.
dc.contributor.authorBauer, F. E.
dc.contributor.authorBlain, A.W.
dc.contributor.authorChapman, S.C.
dc.contributor.authorCoppin, Kristen
dc.contributor.authorIvison, R.J.
dc.contributor.authorMenendez-Delmestre, K.
dc.date.accessioned2013-08-05T14:03:29Z
dc.date.available2013-08-05T14:03:29Z
dc.date.issued2008-05
dc.identifier.citationAlexander , D M , Brandt , W N , Smail , I , Swinbank , A M , Bauer , F E , Blain , A W , Chapman , S C , Coppin , K , Ivison , R J & Menendez-Delmestre , K 2008 , ' Weighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nuclei ' , Astronomical Journal , vol. 135 , no. 5 , pp. 1968-1981 . https://doi.org/10.1088/0004-6256/135/5/1968
dc.identifier.issn0004-6256
dc.identifier.otherPURE: 2138009
dc.identifier.otherPURE UUID: 98ae1fe0-37a7-4f8d-94eb-1b7ce0ae82f5
dc.identifier.otherArXiv: http://arxiv.org/abs/0803.0634v1
dc.identifier.otherScopus: 49549087546
dc.identifier.otherORCID: /0000-0002-0729-2988/work/30423114
dc.identifier.urihttp://hdl.handle.net/2299/11305
dc.description.abstractWe place direct observational constraints on the black-hole masses of the cosmologically important z~2 submillimeter-emitting galaxy (SMG; f850>4mJy) population, and use measured host-galaxy masses to explore their evolutionary status. We employ the well-established virial black-hole mass estimator to 'weigh' the black holes of a sample of z~2 SMGs with broad Halpha or Hbeta emission. The average black-hole mass and Eddington ratio (eta) of the lower-luminosity broad-line SMGs (L_X~10^44 erg/s} are log(M_BH/M_sol)~8.0 and eta~0.2, respectively. These lower-luminosity broad-line SMGs lie in the same location of the L_X-L_FIR plane as more typical SMGs hosting X-ray obscured AGN and may be intrinsically similar systems, but orientated so that the rest-frame optical nucleus is visible. Under this hypothesis, we conclude that SMGs host black holes with log(M_BH/M_odot)~7.8; we find supporting evidence from observations of local ULIRGs. Combining these black-hole mass constraints with measured host-galaxy masses, we find that the black holes in SMGs are >3 times smaller than those found in comparably massive normal galaxies in the local Universe, albeit with considerable uncertainty, and >10 times smaller than those predicted for z~2 luminous quasars and radio galaxies. These results imply that the growth of the black hole lags that of the host galaxy in SMGs, in stark contrast with that previously suggested for radio galaxies and luminous quasars at z~2. On the basis of current host-galaxy mass constraints, we show that SMGs and their descendants cannot lie significantly above the locally defined M_BH-M_GAL relationship. We argue that the black holes in the z~0 descendents of SMGs will have log(M_BH/M_odot)~8.6, indicating that they only need to grow by a factor of ~6 by the present day (ABRIDGED).en
dc.format.extent14
dc.language.isoeng
dc.relation.ispartofAstronomical Journal
dc.titleWeighing the Black Holes in z~2 Submillimeter-Emitting Galaxies Hosting Active Galactic Nucleien
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.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-6256/135/5/1968
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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