Skip to content

UV-luminous, star-forming hosts of z ∼ 2 reddened quasars in the Dark Energy Survey

Research output: Contribution to journalArticle

  • C. F. Wethers
  • M. Banerji
  • P. C. Hewett
  • C. A. Lemon
  • R. G. Mcmahon
  • S. L. Reed
  • Y. Shen
  • F. B. Abdalla
  • A. Benoit-lévy
  • D. Brooks
  • E. Buckley-geer
  • D. Capozzi
  • A Carnero Rosell
  • M. Carrascokind
  • J. Carretero
  • C. E. Cunha
  • L. N. Da Costa
  • D. L. Depoy
  • S. Desai
  • P. Doel
  • B. Flaugher
  • P. Fosalba
  • J. Frieman
  • J. García-bellido
  • D. W. Gerdes
  • D. Gruen
  • R. A. Gruendl
  • J. Gschwend
  • G. Gutierrez
  • K. Honscheid
  • D. J. James
  • T. Jeltema
  • K. Kuehn
  • S. Kuhlmann
  • N. Kuropatkin
  • M. Lima
  • M. A. G. Maia
  • J. L. Marshall
  • P. Martini
  • F. Menanteau
  • R. Miquel
  • B. Nord
  • A. A. Plazas
  • A. K. Romer
  • E. Sanchez
  • V. Scarpine
  • R. Schindler
  • M. Schubnell
  • I. Sevilla-noarbe
  • Matthew Smith
  • R. C. Smith
  • M. Soares-santos
  • F. Sobreira
  • E. Suchyta
  • G. Tarle
  • A. R. Walker
We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity [E(B − V)QSO ≳ 0.5; Lbol > 1046 erg s−1] broad-line quasars at 1.5 < z < 2.7. We combine the first year of deep, optical, ground-based observations from the Dark Energy Survey (DES) with the near-infrared VISTA Hemisphere Survey and UKIDSS Large Area Survey data, from which the reddened quasars were initially identified. We demonstrate that the significant dust reddening towards the quasar in our sample allows host galaxy emission to be detected at the rest-frame UV wavelengths probed by the DES photometry. By exploiting this reddening effect, we disentangle the quasar emission from that of the host galaxy via spectral energy distribution fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least 10 quasars, with a further three quasars exhibiting emission consistent with either star formation or scattered light. From the rest-frame UV emission, we derive instantaneous, dust-corrected star formation rates (SFRs) in the range 25 < SFRUV < 365 M yr−1, with an average SFRUV = 130 ± 95 M yr−1. We find a broad correlation between SFRUV and the bolometric quasar luminosity. Overall, our results show evidence for coeval star formation and black hole accretion occurring in luminous, reddened quasars at the peak epoch of galaxy formation.
Original languageEnglish
Pages (from-to)3682-3699
JournalMonthly Notices of the Royal Astronomical Society
Volume475
Issue number3
Early online date5 Jan 2018
DOIs
Publication statusPublished - 11 Apr 2018

Documents

  • UV-luminous, star-forming hosts

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    Final published version, 5 MB, PDF-document

Related information

Relations Get citation (various referencing formats)

ID: 8856210