Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 487, Issue 2, Pages 1874-1885Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz1341
Keywords
galaxies: active; galaxies: formation; galaxies: high-redshift; dark ages, reionization, first stars; quasars: individual: VDES J0224-4711; quasars: individual: VDES J0244-5008; quasars: individual: VDES J0020-3653; quasars: individual: VDES J0246-5219
Categories
Funding
- UK Science and Technology Facilities Council (STFC)
- STFC via an Ernest Rutherford Fellowship
- Royal Society via a University Research Fellowship
- European Research Council (ERC) Advanced Grant [320596]
- National Science Foundation [1615553]
- ESO Progamme [179.A2010]
- European Southern Observatory (ESO) Progammes [098.A-0439, 0100.A00346]
- Gemini Observatory [GS-2016B-FT-8]
- US Department of Energy
- US National Science Foundation
- Ministry of Science and Education of Spain
- Science and Technology Facilities Council of UK
- Higher Education Funding Council for England
- National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
- Kavli Institute of Cosmological Physics at the University of Chicago
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Ministerio da Ciencia e Tecnologia
- Deutsche Forschungsgemeinschaft
- Argonne National Laboratories
- University of California at Santa Cruz
- University of Cambridge
- Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid
- University of Chicago
- University College London
- DES-Brazil Consortium
- Eidgenossische Technische Hochschule (ETH) Zurich
- Fermi National Accelerator Laboratory
- University of Edinburgh
- University of Illinois at Urbana-Champaign
- Institut de Ciencies de l'Espai (IEEC/CSIC)
- Institut de Fisica d'Altes Energies
- Lawrence Berkeley National Laboratory
- Ludwig-Maximilians Universitat
- associated Excellence Cluster Universe
- University of Michigan
- National Optical Astronomy Observatory
- University of Nottingham
- Ohio State University
- University of Pennsylvania
- University of Portsmouth
- SLAC National Laboratory
- Stanford University
- University of Sussex
- Texas AM University
- STFC [ST/S000623/1, ST/R000476/1, ST/S000550/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1615553] Funding Source: National Science Foundation
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We report the results from a search for z > 6.5 quasars using the Dark Energy Survey (DES) Year 3 data set combined with the VISTA Hemisphere Survey (VHS) and WISE All-Sky Survey. Our photometric selection method is shown to be highly efficient in identifying clean samples of high-redshift quasars, leading to spectroscopic confirmation of three new quasars -VDES J0244-5008 (z = 6,724), VDES J0020-3653 (z = 6.834), and VDES J0246-5219 (z = 6.90) - which were selected as the highest priority candidates in the survey data without any need for additional follow-up observations. We have obtained spectroscopic observations in the near-infrared for VDES J0244-5008 and VDES J0020-3653 as well as our previously identified quasar, VDES J0224-471 1 at z = 6.50 from Reed et al, We use the near-infrared spectra to derive virial black hole masses from the full width at half-maximum of the Mg II line. These black hole masses are similar or equal to 1-2 x 10(9) M-circle dot. Combined with the bolometric luminosities of these quasars of L-bot similar or equal to 1-3 x 10(47), these imply that the Eddington ratios are high, similar or equal to 0.6-1.1. We consider the C iv emission line properties of the sample and demonstrate that our highredshift quasars do not have unusual C iv line properties when compared to carefully matched low-redshift samples. Our new DES + VHS z > 6.5 quasars now add to the growing census of luminous, rapidly accreting supermassive black holes seen well into the epoch of reionization.
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