Clustering redshift distribution calibration of weak lensing surveys using the DESI-DR1 spectroscopic dataset
Authors
R. Ruggeri
C. Blake
J. Aguilar
S. Ahlen
D. Bianchi
D. Brooks
F. J. Castander
T. Claybaugh
A. Cuceu
K. S. Dawson
A. de la Macorra
B. Dey
P. Doel
A. Elliott
N. Emas
S. Ferraro
A. Font-Ribera
J. E. Forero-Romero
C. Garcia-Quintero
E. Gaztañaga
S. Gontcho A Gontcho
G. Gutierrez
J. Guy
B. Hadzhiyska
H. K. Herrera-Alcantar
S. Heydenreich
K. Honscheid
C. Howlett
D. Huterer
M. Ishak
S. Joudaki
R. Joyce
D. Kirkby
A. Krolewski
O. Lahav
C. Lamman
M. Landriau
J. U. Lange
A. Leauthaud
M. E. Levi
M. Manera
A. Meisner
R. Miquel
J. Moustakas
S. Nadathur
J. A. Newman
W. J. Percival
C. Poppett
A. Porredon
F. Prada
I. Pérez-Ràfols
A. Robertson
G. Rossi
E. Sanchez
C. Saulder
D. Schlegel
M. Schubnell
A. Semenaite
H. Seo
J. Silber
D. Sprayberry
G. Tarlé
B. A. Weaver
P. Zarrouk
R. Zhou
H. Zou
Abstract
We estimate the source redshift distribution of current weak lensing surveys by applying the clustering-based redshift calibration technique, using the galaxy redshift sample provided by the Dark Energy Spectroscopic Instrument Data Release 1 (DESI-DR1). We cross-correlate the Bright Galaxy Survey (BGS), Luminous Red Galaxies (LRGs) and Emission Line Galaxies (ELGs) from DESI, within the redshift range $0.1 < z < 1.6$, with overlapping tomographic source samples from the Dark Energy Survey (DES), Kilo-Degree Survey (KiDS), and Hyper Suprime-Cam (HSC) survey. Using realistic mock catalogues, we test the stability of the clustering-redshift signal to fitting scale, reference-sample choice, and the evolution of source galaxy bias, and we explicitly model and marginalise over magnification contributions, which become non-negligible at $z \gtrsim 1$ due to the depth of the DESI ELG sample. We then compare the resulting bias-weighted redshift distributions to those calibrated using self-organising map (SOM) techniques, finding agreement within uncertainties for all surveys and tomographic bins. Our results demonstrate that clustering redshifts enabled by DESI's unprecedented spectroscopic sample provides a robust, complementary, and independent constraint capable of reducing one of the dominant systematic uncertainties in weak lensing cosmology.
