The DECADE cosmic shear project II: photometric redshift calibration of the source galaxy sample

D. Anbajagane; A. Alarcon; R. Teixeira; C. Chang; L. F. Secco; C. Y. Tan; A. Drlica-Wagner; M. Adamow; R. A. Gruendl; G. Giannini; M. R. Becker; P. S. Ferguson; N. Chicoine; Z. Zhang; K. Herron; D. Suson; A. N. Alsina; A. Amon; C. R. Bom; J. A. Carballo-Bello; W. Cerny; A. Choi; Y. Choi; C. Doux; K. Eckert; M. Gatti; D. Gruen; W. G. Hartley; K. Herner; E. M. Huff; D. J. James; N. Kuropatkin; C. E. Martínez-Vázquez; P. Massana; S. Mau; J. McCullough; G. E. Medina; B. Mutlu-Pakdil; J. Myles; M. Navabi; N. E. D. Noël; A. B. Pace; M. Raveri; A. H. Riley; J. D. Sakowska; D. Sanchez-Cid; D. J. Sand; L. Santana-Silva; I. Sevilla-Noarbe; M. Soares-Santos; G. S. Stringfellow; A. K. Vivas; M. Yamamoto

doi:10.33232/001c.146159

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arXiv · 2502.17675

The DECADE cosmic shear project II: photometric redshift calibration of the source galaxy sample

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Abstract

We present the photometric redshift characterization and calibration for the Dark Energy Camera All Data Everywhere (DECADE) weak lensing dataset: a catalog of 107 million galaxies observed by the Dark Energy Camera (DECam) in the northern Galactic cap. The redshifts are estimated from a combination of wide-field photometry, deep-field photometry with associated redshift estimates, and a transfer function between the wide field and deep field that is estimated using a source injection catalog. We construct four tomographic bins for the galaxy catalog, and estimate the redshift distribution, $n(z)$, within each one using the Self-organizing Map Photo-Z (SOMPZ) methodology. Our estimates include the contributions from sample variance, zeropoint calibration uncertainties, and redshift biases, as quantified for the deep-field dataset. The total uncertainties on the mean redshifts are $\sigma_{\langle z \rangle} \approx 0.01$. The SOMPZ estimates are then compared to those from the clustering redshift method, obtained by cross-correlating our source galaxies with galaxies in spectroscopic surveys, and are shown to be consistent with each other.

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D. Anbajagane, A. Alarcon, R. Teixeira, C. Chang, L. F. Secco, C. Y. Tan, A. Drlica-Wagner, M. Adamow, R. A. Gruendl, G. Giannini, M. R. Becker, P. S. Ferguson, N. Chicoine, Z. Zhang, K. Herron, D. Suson, A. N. Alsina, A. Amon, C. R. Bom, J. A. Carballo-Bello, W. Cerny, A. Choi, Y. Choi, C. Doux, K. Eckert, M. Gatti, D. Gruen, W. G. Hartley, K. Herner, E. M. Huff, D. J. James, N. Kuropatkin, C. E. Martínez-Vázquez, P. Massana, S. Mau, J. McCullough, G. E. Medina, B. Mutlu-Pakdil, J. Myles, M. Navabi, N. E. D. Noël, A. B. Pace, M. Raveri, A. H. Riley, J. D. Sakowska, D. Sanchez-Cid, D. J. Sand, L. Santana-Silva, I. Sevilla-Noarbe, M. Soares-Santos, G. S. Stringfellow, A. K. Vivas, M. Yamamoto. 2025-02-24. The DECADE cosmic shear project II: photometric redshift calibration of the source galaxy sample. https://doi.org/10.33232/001c.146159

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