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Journal Articles Astronomy and Astrophysics - A&A Year : 2019

Euclid preparation

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R. Barnett
  • Function : Correspondent author
S. J. Warren
  • Function : Author
D. J. Mortlock
  • Function : Author
C. Conselice
P. C. Hewett
  • Function : Author
C. J. Willott
  • Function : Author
N. Auricchio
  • Function : Author
A. Balaguera-Antolínez
M. Baldi
S. Bardelli
F. Bellagamba
  • Function : Author
R. Bender
A. Biviano
D. Bonino
  • Function : Author
E. Bozzo
E. Branchini
M. Brescia
  • Function : Author
J. Brinchmann
C. Burigana
  • Function : Author
S. Camera
V. Capobianco
  • Function : Author
J. Carretero
  • Function : Author
F. J. Castander
M. Castellano
S. Cavuoti
  • Function : Author
A. Cimatti
G. Congedo
L. Conversi
  • Function : Author
Y. Copin
L. Corcione
  • Function : Author
J. Coupon
  • Function : Author
A. da Silva
  • Function : Author
C. A. J. Duncan
  • Function : Author
S. Dusini
  • Function : Author
P. Fosalba
S. Fotopoulou
  • Function : Author
M. Frailis
  • Function : Author
M. Fumana
  • Function : Author
S. Galeotta
  • Function : Author
W. Gillard
F. Grupp
  • Function : Author
H. Hoekstra
F. Hormuth
  • Function : Author
H. Israel
  • Function : Author
K. Jahnke
M. Kilbinger
T. Kitching
  • Function : Author
R. Kohley
  • Function : Author
M. Kunz
  • Function : Author
R. Laureijs
  • Function : Author
S. Ligori
  • Function : Author
P. B. Lilje
  • Function : Author
I. Lloro
  • Function : Author
E. Maiorano
  • Function : Author
O. Mansutti
  • Function : Author
O. Marggraf
  • Function : Author
R. Massey
  • Function : Author
N. Mauri
  • Function : Author
E. Medinaceli
  • Function : Author
R. B. Metcalf
  • Function : Author
G. Meylan
  • Function : Author
L. Moscardini
  • Function : Author
E. Munari
  • Function : Author
C. Neissner
  • Function : Author
S. M. Niemi
  • Function : Author
T. Nutma
  • Function : Author
C. Padilla
S. Paltani
F. Pasian
  • Function : Author
F. Raison
  • Function : Author
A. Renzi
  • Function : Author
J. Rhodes
H.-W. Rix
  • Function : Author
E. Romelli
  • Function : Author
M. Roncarelli
  • Function : Author
R. Saglia
D. Sapone
  • Function : Author
R. Scaramella
  • Function : Author
P. Schneider
S. Serrano
  • Function : Author
G. Sirri
  • Function : Author
L. Stanco
  • Function : Author
P. Tallada-Crespí
  • Function : Author
M. Tenti
  • Function : Author
I. Tereno
  • Function : Author
R. Toledo-Moreo
  • Function : Author
F. Torradeflot
  • Function : Author
A. Zacchei
  • Function : Author
G. Zamorani
J. Zoubian
E. Zucca

Abstract

We provide predictions of the yield of 7 <  z <  9 quasars from the Euclid wide survey, updating the calculation presented in the Euclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper rates of decline of the quasar luminosity function (QLF; $\Phi$) with redshift, $\Phi$ ∝ 10$^{k(z−6)}$, $k$ = −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 use of an improved Bayesian selection method, compared to the colour cuts used for the Red Book calculation, allowing the identification of fainter quasars, down to $J_{AB}$ $\sim$23. Quasars at z >  8 may be selected from $Euclid\ OYJH$ photometry alone, but selection over the redshift interval 7 <  z <  8 is greatly improved by the addition of z-band data from, e.g., Pan-STARRS and LSST. We calculate predicted quasar yields for the assumed values of the rate of decline of the QLF beyond z = 6. If the decline of the QLF accelerates beyond z = 6, with $k$ = −0.92, Euclid should nevertheless find over 100 quasars with 7.0 <  z <  7.5, and $\sim$25 quasars beyond the current record of z = 7.5, including $\sim$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, $M_{1450}$ <  −25, using 8 m class telescopes to confirm candidates, but follow-up with JWST or E-ELT will be required to measure the faint-end slope. Contamination of the candidate lists is predicted to be modest even at $J_{AB}$$\sim$ 23. The precision with which k can be determined over 7 <  z <  8 depends on the value of $k$, but assuming k = −0.72 it can be measured to a 1$\sigma$ uncertainty of 0.07.
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Dates and versions

cea-02334278 , version 1 (25-10-2019)

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R. Barnett, S. J. Warren, D. J. Mortlock, J.-G. Cuby, C. Conselice, et al.. Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey. Astronomy and Astrophysics - A&A, 2019, 631, pp.A85. ⟨10.1051/0004-6361/201936427⟩. ⟨cea-02334278⟩
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