UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey
Authors
Wethers, CF
Reed, Sophie
Shen, Y
Abdalla, FB
Benoit-Lévy, A
Brooks, D
Buckley-Geer, E
Capozzi, D
Carnero Rosell, A
CarrascoKind, M
Carretero, J
Cunha, CE
D'Andrea, CB
da Costa, LN
DePoy, DL
Desai, S
Doel, P
Flaugher, B
Fosalba, P
Frieman, J
García-Bellido, J
Gerdes, DW
Gruen, D
Gruendl, RA
Gschwend, J
Gutierrez, G
Honscheid, K
James, DJ
Jeltema, T
Kuehn, K
Kuhlmann, S
Kuropatkin, N
Lima, M
Maia, MAG
Marshall, JL
Martini, P
Menanteau, F
Miquel, R
Nichol, RC
Nord, B
Plazas, AA
Romer, AK
Sanchez, E
Scarpine, V
Schindler, R
Schubnell, M
Sevilla-Noarbe, I
Smith, M
Smith, RC
Soares-Santos, M
Sobreira, F
Suchyta, E
Tarle, G
Walker, AR
Publication Date
2018-04-01Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
Publisher
Oxford University Press
Volume
475
Issue
3
Pages
3682-3699
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Wethers, C., Banerji, M., Hewett, P., Lemon, C., McMahon, R., Reed, S., Shen, Y., et al. (2018). UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey. Monthly Notices of the Royal Astronomical Society, 475 (3), 3682-3699. https://doi.org/10.1093/mnras/stx3332
Abstract
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$^{-1}$. 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.
Sponsorship
SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/N000927/1)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL (ST/M005305/1)
PPARC (via University College London (UCL)) (CJAAM)
STFC (ST/K000985/1)
Science and Technology Facilities Council (ST/N002571/1)
STFC (1369580)
STFC (1638336)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1093/mnras/stx3332
This record's URL: https://www.repository.cam.ac.uk/handle/1810/273961
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