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R. Barnett
- Function : Correspondent author
S. J. Warren
- Function : Author
D. J. Mortlock
- Function : Author
C. Conselice
- Function : Author
- PersonId : 766462
- ORCID : 0000-0003-1949-7638
- IdRef : 181314665
P. C. Hewett
- Function : Author
C. J. Willott
- Function : Author
N. Auricchio
- Function : Author
A. Balaguera-Antolínez
- Function : Author
- PersonId : 797765
- ORCID : 0000-0001-5028-3035
M. Baldi
- Function : Author
- PersonId : 759882
- ORCID : 0000-0003-4145-1943
S. Bardelli
- Function : Author
- PersonId : 755650
- ORCID : 0000-0002-8900-0298
F. Bellagamba
- Function : Author
R. Bender
- Function : Author
- PersonId : 759196
- ORCID : 0000-0001-7179-0626
A. Biviano
- Function : Author
- PersonId : 755569
- ORCID : 0000-0002-0857-0732
- IdRef : 233130799
D. Bonino
- Function : Author
E. Bozzo
- Function : Author
- PersonId : 765668
- ORCID : 0000-0002-7504-7423
E. Branchini
- Function : Author
- PersonId : 759617
- ORCID : 0000-0002-0808-6908
M. Brescia
- Function : Author
J. Brinchmann
- Function : Author
- PersonId : 755781
- ORCID : 0000-0003-4359-8797
- IdRef : 224540513
C. Burigana
- Function : Author
S. Camera
- Function : Author
- PersonId : 766641
- ORCID : 0000-0003-3399-3574
V. Capobianco
- Function : Author
J. Carretero
- Function : Author
F. J. Castander
- Function : Author
- PersonId : 755626
- ORCID : 0000-0001-7316-4573
M. Castellano
- Function : Author
- PersonId : 755152
- ORCID : 0000-0001-9875-8263
S. Cavuoti
- Function : Author
A. Cimatti
- Function : Author
- PersonId : 786030
- ORCID : 0000-0002-4409-5633
G. Congedo
- Function : Author
- PersonId : 766465
- ORCID : 0000-0003-2508-0046
L. Conversi
- Function : Author
Y. Copin
- Function : Author
- PersonId : 48
- IdHAL : yannick-copin
- ORCID : 0000-0002-5317-7518
- IdRef : 15009728X
L. Corcione
- Function : Author
J. Coupon
- Function : Author
A. da Silva
- Function : Author
C. A. J. Duncan
- Function : Author
S. Dusini
- Function : Author
S. Farrens
- Function : Author
- PersonId : 791647
- ORCID : 0000-0002-9594-9387
P. Fosalba
- Function : Author
- PersonId : 755449
- ORCID : 0000-0002-1510-5214
S. Fotopoulou
- Function : Author
M. Frailis
- Function : Author
M. Fumana
- Function : Author
S. Galeotta
- Function : Author
B. Garilli
- Function : Author
- PersonId : 755663
- ORCID : 0000-0001-7455-8750
- IdRef : 170321126
W. Gillard
- Function : Author
- PersonId : 1159625
- IdHAL : william-gillard
- ORCID : 0000-0003-4744-9748
- IdRef : 129220787
J. Graciá-Carpio
- Function : Author
- PersonId : 797766
- ORCID : 0000-0003-4689-3134
F. Grupp
- Function : Author
H. Hoekstra
- Function : Author
- PersonId : 759828
- ORCID : 0000-0002-0641-3231
F. Hormuth
- Function : Author
H. Israel
- Function : Author
K. Jahnke
- Function : Author
- PersonId : 755700
- ORCID : 0000-0003-3804-2137
M. Kilbinger
- Function : Author
- PersonId : 760762
- ORCID : 0000-0001-9513-7138
- IdRef : 231841981
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
F. Marulli
- Function : Author
- PersonId : 766464
- ORCID : 0000-0002-8850-0303
R. Massey
- Function : Author
N. Mauri
- Function : Author
E. Medinaceli
- Function : Author
R. B. Metcalf
- Function : Author
G. Meylan
- Function : Author
M. Moresco
- Function : Author
- PersonId : 761800
- ORCID : 0000-0002-7616-7136
L. Moscardini
- Function : Author
E. Munari
- Function : Author
C. Neissner
- Function : Author
S. M. Niemi
- Function : Author
T. Nutma
- Function : Author
C. Padilla
- Function : Author
- PersonId : 791235
- ORCID : 0000-0001-7951-0166
S. Paltani
- Function : Author
- PersonId : 755532
- ORCID : 0000-0002-8108-9179
F. Pasian
- Function : Author
F. Raison
- Function : Author
A. Renzi
- Function : Author
J. Rhodes
- Function : Author
- PersonId : 755435
- ORCID : 0000-0002-4485-8549
H.-W. Rix
- Function : Author
E. Romelli
- Function : Author
M. Roncarelli
- Function : Author
R. Saglia
- Function : Author
- PersonId : 759894
- ORCID : 0000-0003-0378-7032
D. Sapone
- Function : Author
R. Scaramella
- Function : Author
P. Schneider
- Function : Author
- PersonId : 755611
- ORCID : 0000-0002-5094-2245
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
- Function : Author
- PersonId : 755662
- ORCID : 0000-0002-2318-301X
- IdRef : 190956429
J. Zoubian
- Function : Author
- PersonId : 753544
- IdHAL : julien-zoubian
- ORCID : 0000-0003-1962-9805
- IdRef : 170320561
E. Zucca
- Function : Author
- PersonId : 755651
- ORCID : 0000-0002-5845-8132
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.
Origin : Publication funded by an institution
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