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

We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$$_{\rm{QSO}}\gtrsim$$ 0.5; L$$_{\rm{bol}}>$$ 10$$^{46}$$ergs$$^{-1}$$) 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 (VHS) and UKIDSS Large Area Survey (ULAS) 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 (SED) fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least ten 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 < SFR$$_{\rm{UV}}$$ < 365 M$$_{\odot}$$yr$$^{-1}$$, with an average SFR$$_{\rm{UV}}$$ = 130 $$\pm$$ 95 M$$_{\odot}$$yr$$^{-1}$$. In conclusion, we find a broad correlation between SFR$$_{\rm{UV}}$$ 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.
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Publication Date:
Report Number(s):
arXiv:1801.02635; FERMILAB-PUB-18-022-A-AD-AE-CD
Journal ID: ISSN 0035-8711; 1647255; TRN: US1801721
Grant/Contract Number:
AC02-07CH11359; AC05-00OR22725
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 475; Journal Issue: 3; Journal ID: ISSN 0035-8711
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Contributing Orgs:
DES Collaboration
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: evolution; galaxies: high-redshift; quasars: general; galaxies: star formation; ultraviolet: galaxies
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1426563