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UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the dark energy survey

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posted on 2023-06-09, 12:22 authored by C F Wethers, M Banerji, P C Hewett, C A Lemon, R G McMahon, S L Reed, Y Shen, Kathy RomerKathy Romer, The DES Collaboration, Others
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.

Funding

University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices Of The Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

03

Volume

475

Page range

3682-3699

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-03-05

First Open Access (FOA) Date

2018-03-05

First Compliant Deposit (FCD) Date

2018-03-02

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