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@article{Barnett:2019:0004-6361/201936427,
author = {Barnett, R and Warren, SJ and Mortlock, DJ and Cuby, J-G and Conselice, C and Hewett, PC and Willott, CJ},
doi = {0004-6361/201936427},
journal = {Astronomy & Astrophysics},
title = {Euclid preparation. V. Predicted yield of redshift 7<z<9 quasars from the wide survey},
url = {http://dx.doi.org/10.1051/0004-6361/201936427},
volume = {631},
year = {2019}
}

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TY  - JOUR
AB  - We provide predictions of the yield of 7 < z < 9 quasars from the Euclid wide survey, updating the calculation presented in theEuclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper ratesof decline of the quasar luminosity function (QLF; Φ) with redshift, Φ ∝ 10k(z−6), k = −0.72, and a further steeper rate of decline,k = −0.92; we use better models of the contaminating populations (MLT dwarfs and compact early-type galaxies); and we make useof an improved Bayesian selection method, compared to the colour cuts used for the Red Book calculation, allowing the identificationof fainter quasars, down to JAB ∼ 23. Quasars at z > 8 may be selected from Euclid OY JH photometry alone, but selection overthe redshift interval 7 < z < 8 is greatly improved by the addition of z-band data from, e.g., Pan-STARRS and LSST. We calculatepredicted quasar yields for the assumed values of the rate of decline of the QLF beyond z = 6. If the decline of the QLF acceleratesbeyond z = 6, with k = −0.92, Euclid should nevertheless find over 100 quasars with 7.0 < z < 7.5, and ∼ 25 quasars beyond thecurrent record of z = 7.5, including ∼ 8 beyond z = 8.0. The first Euclid quasars at z > 7.5 should be found in the DR1 data release,expected in 2024. It will be possible to determine the bright-end slope of the QLF, 7 < z < 8, M1450 < −25, using 8 m class telescopesto confirm candidates, but follow-up with JWST or E-ELT will be required to measure the faint-end slope. Contamination of thecandidate lists is predicted to be modest even at JAB ∼ 23. The precision with which k can be determined over 7 < z < 8 depends onthe value of k, but assuming k = −0.72 it can be measured to a 1σ uncertainty of 0.07.
AU  - Barnett,R
AU  - Warren,SJ
AU  - Mortlock,DJ
AU  - Cuby,J-G
AU  - Conselice,C
AU  - Hewett,PC
AU  - Willott,CJ
DO  - 0004-6361/201936427
PY  - 2019///
SN  - 0004-6361
TI  - Euclid preparation. V. Predicted yield of redshift 7<z<9 quasars from the wide survey
T2  - Astronomy & Astrophysics
UR  - http://dx.doi.org/10.1051/0004-6361/201936427
UR  - http://hdl.handle.net/10044/1/73453
VL  - 631
ER  -

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