Wethers, CF;
Banerji, M;
Hewett, PC;
Lemon, CA;
McMahon, RG;
Reed, SL;
Shen, Y;
... Walker, AR; + view all
(2018)
UV-luminous, star-forming hosts of z similar to 2 reddened quasars in the Dark Energy Survey.
In:
(pp. pp. 3682-3699).
OXFORD UNIV PRESS
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Abstract
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.
| Type: | Proceedings paper |
|---|---|
| Title: | UV-luminous, star-forming hosts of z similar to 2 reddened quasars in the Dark Energy Survey |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx3332 |
| Publisher version: | https://doi.org/10.1093/mnras/stx3332 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: active, galaxies: evolution, galaxies: high-redshift, quasars: general, galaxies: star formation, ultraviolet: galaxies, Supermassive Black-Holes, Radio-Quiet Quasars, Digital Sky Survey, Submillimeter Galaxies, Interstellar Dust, Elliptic Galaxies, Formation History, Type-1 Quasars, Milky-Way, H-Alpha |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10046805 |
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