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Dark Energy Survey Year 6 Results: MagLim++ Lens Sample Selection and Measurements of Galaxy Clustering

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Main Authors:	Weaverdyck, N., Rodríguez-Monroy, M., Elvin-Poole, J., Sevilla-Noarbe, I., Porredon, A., Avila, S., Lee, S., Riquelme, W., Tabbutt, M., Huterer, D., Prat, J., De Vicente, J., Mena-Fernández, J., Crocce, M., Sánchez, C., Bernstein, G. M., Henning, E., Cawthon, R., Ross, A. J., Abbott, T. M. C., Aguena, M., Allam, S. S., Alves, O., Andrade-Oliveira, F., Bacon, D., Bechtol, K., Bertin, E., Blazek, J., Bocquet, S., Brooks, D., Camilleri, R., Rosell, A. Carnero, Carretero, J., Castander, F. J., Choi, A., da Costa, L. N., Pereira, M. E. da Silva, Davis, T. M., Diehl, H. T., Doux, C., Drlica-Wagner, A., Eifler, T., Everett, S., Evrard, A., Flaugher, B., García-Bellido, J., Gatti, M., Gaztañaga, E., Giannini, G., Gruen, D., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Jain, B., Kacprzak, T., Kuehn, K., Lahav, O., Marshall, J. L., Menanteau, F., Miquel, R., Mohr, J. J., Muir, J., Myles, J., Nichol, R., Ogando, R. L. C., Palmese, A., Paterno, M., Percival, W. J., Malagón, A. A. Plazas, Rosenfeld, R., Rykoff, E., Samuroff, S., Sanchez, E., Cid, D. Sanchez, Sheldon, E., Sherman, N., Smith, M., Soares-Santos, M., Suchyta, E., Swanson, M. E. C., Gregory, T., Thomas, D., To, C., Tucker, D. L., Vikram, V., Yamamoto, M., Yanny, B.
Format:	Preprint
Published:	2026
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Weaverdyck, N. Rodríguez-Monroy, M. Elvin-Poole, J. Sevilla-Noarbe, I. Porredon, A. Avila, S. Lee, S. Riquelme, W. Tabbutt, M. Huterer, D. Prat, J. De Vicente, J. Mena-Fernández, J. Crocce, M. Sánchez, C. Bernstein, G. M. Henning, E. Cawthon, R. Ross, A. J. Abbott, T. M. C. Aguena, M. Allam, S. S. Alves, O. Andrade-Oliveira, F. Bacon, D. Bechtol, K. Bertin, E. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. Castander, F. J. Choi, A. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Diehl, H. T. Doux, C. Drlica-Wagner, A. Eifler, T. Everett, S. Evrard, A. Flaugher, B. García-Bellido, J. Gatti, M. Gaztañaga, E. Giannini, G. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Jain, B. Kacprzak, T. Kuehn, K. Lahav, O. Marshall, J. L. Menanteau, F. Miquel, R. Mohr, J. J. Muir, J. Myles, J. Nichol, R. Ogando, R. L. C. Palmese, A. Paterno, M. Percival, W. J. Malagón, A. A. Plazas Rosenfeld, R. Rykoff, E. Samuroff, S. Sanchez, E. Cid, D. Sanchez Sheldon, E. Sherman, N. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M. E. C. Gregory, T. Thomas, D. To, C. Tucker, D. L. Vikram, V. Yamamoto, M. Yanny, B.
author_facet	Weaverdyck, N. Rodríguez-Monroy, M. Elvin-Poole, J. Sevilla-Noarbe, I. Porredon, A. Avila, S. Lee, S. Riquelme, W. Tabbutt, M. Huterer, D. Prat, J. De Vicente, J. Mena-Fernández, J. Crocce, M. Sánchez, C. Bernstein, G. M. Henning, E. Cawthon, R. Ross, A. J. Abbott, T. M. C. Aguena, M. Allam, S. S. Alves, O. Andrade-Oliveira, F. Bacon, D. Bechtol, K. Bertin, E. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. Castander, F. J. Choi, A. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Diehl, H. T. Doux, C. Drlica-Wagner, A. Eifler, T. Everett, S. Evrard, A. Flaugher, B. García-Bellido, J. Gatti, M. Gaztañaga, E. Giannini, G. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Jain, B. Kacprzak, T. Kuehn, K. Lahav, O. Marshall, J. L. Menanteau, F. Miquel, R. Mohr, J. J. Muir, J. Myles, J. Nichol, R. Ogando, R. L. C. Palmese, A. Paterno, M. Percival, W. J. Malagón, A. A. Plazas Rosenfeld, R. Rykoff, E. Samuroff, S. Sanchez, E. Cid, D. Sanchez Sheldon, E. Sherman, N. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M. E. C. Gregory, T. Thomas, D. To, C. Tucker, D. L. Vikram, V. Yamamoto, M. Yanny, B.
contents	Galaxy clustering is a sensitive probe of the expansion history and growth of structure of the universe, and key degeneracies can be broken by combining these data with measurements of cosmic shear and galaxy-galaxy lensing (a so-called 3$\times$2pt analysis). The largest and least biased statistical samples of galaxies for use in clustering analyses can be collected photometrically through large imaging surveys. However, selecting clean photometric subsamples for cosmology are crucial for avoiding contamination that can bias cosmological constraints. Here we present the MagLim++ galaxy sample, selected to optimize for cosmological constraining power and incorporating an array of novel quality cuts to identify and remove residual contamination. This sample comes from the full six years of observations from the Dark Energy Survey. We present measurements of the two-point angular clustering ($w(θ)$) of 9,186,205 galaxies distributed over 4031 sq. degrees and in six tomographic redshift bins centered at $\bar{z}\approx$ [0.31, 0.44, 0.62, 0.78, 0.90, 1.01]. These measurements are used as part of the 3$\times$2pt and other DES Y6 legacy cosmological analyses in companion works. We describe the battery of null tests and mitigation schemes implemented to address observational, astrophysical, and methodological systematics in the analysis. The resulting $w(θ)$ measurements have a S/N = 149 (90.2 for linear scales only), which we use to place galaxy-clustering-only constraints on the matter density of the Universe, $Ω_m=0.311^{+0.023}_{-0.035}$, and amplitude of galaxy clustering in each redshift bin, $b_iσ_8=[1.16^{+0.04}_{-0.06},\ 1.40^{+0.04}_{-0.06},\ 1.57^{+0.04}_{-0.06},\ 1.59^{+0.04}_{-0.05},\ 1.50^{+0.04}_{-0.05},\ 1.74^{+0.06}_{-0.08}]$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2601_14484
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Dark Energy Survey Year 6 Results: MagLim++ Lens Sample Selection and Measurements of Galaxy Clustering Weaverdyck, N. Rodríguez-Monroy, M. Elvin-Poole, J. Sevilla-Noarbe, I. Porredon, A. Avila, S. Lee, S. Riquelme, W. Tabbutt, M. Huterer, D. Prat, J. De Vicente, J. Mena-Fernández, J. Crocce, M. Sánchez, C. Bernstein, G. M. Henning, E. Cawthon, R. Ross, A. J. Abbott, T. M. C. Aguena, M. Allam, S. S. Alves, O. Andrade-Oliveira, F. Bacon, D. Bechtol, K. Bertin, E. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. Castander, F. J. Choi, A. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Diehl, H. T. Doux, C. Drlica-Wagner, A. Eifler, T. Everett, S. Evrard, A. Flaugher, B. García-Bellido, J. Gatti, M. Gaztañaga, E. Giannini, G. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Jain, B. Kacprzak, T. Kuehn, K. Lahav, O. Marshall, J. L. Menanteau, F. Miquel, R. Mohr, J. J. Muir, J. Myles, J. Nichol, R. Ogando, R. L. C. Palmese, A. Paterno, M. Percival, W. J. Malagón, A. A. Plazas Rosenfeld, R. Rykoff, E. Samuroff, S. Sanchez, E. Cid, D. Sanchez Sheldon, E. Sherman, N. Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M. E. C. Gregory, T. Thomas, D. To, C. Tucker, D. L. Vikram, V. Yamamoto, M. Yanny, B. Cosmology and Nongalactic Astrophysics Galaxy clustering is a sensitive probe of the expansion history and growth of structure of the universe, and key degeneracies can be broken by combining these data with measurements of cosmic shear and galaxy-galaxy lensing (a so-called 3$\times$2pt analysis). The largest and least biased statistical samples of galaxies for use in clustering analyses can be collected photometrically through large imaging surveys. However, selecting clean photometric subsamples for cosmology are crucial for avoiding contamination that can bias cosmological constraints. Here we present the MagLim++ galaxy sample, selected to optimize for cosmological constraining power and incorporating an array of novel quality cuts to identify and remove residual contamination. This sample comes from the full six years of observations from the Dark Energy Survey. We present measurements of the two-point angular clustering ($w(θ)$) of 9,186,205 galaxies distributed over 4031 sq. degrees and in six tomographic redshift bins centered at $\bar{z}\approx$ [0.31, 0.44, 0.62, 0.78, 0.90, 1.01]. These measurements are used as part of the 3$\times$2pt and other DES Y6 legacy cosmological analyses in companion works. We describe the battery of null tests and mitigation schemes implemented to address observational, astrophysical, and methodological systematics in the analysis. The resulting $w(θ)$ measurements have a S/N = 149 (90.2 for linear scales only), which we use to place galaxy-clustering-only constraints on the matter density of the Universe, $Ω_m=0.311^{+0.023}_{-0.035}$, and amplitude of galaxy clustering in each redshift bin, $b_iσ_8=[1.16^{+0.04}_{-0.06},\ 1.40^{+0.04}_{-0.06},\ 1.57^{+0.04}_{-0.06},\ 1.59^{+0.04}_{-0.05},\ 1.50^{+0.04}_{-0.05},\ 1.74^{+0.06}_{-0.08}]$.
title	Dark Energy Survey Year 6 Results: MagLim++ Lens Sample Selection and Measurements of Galaxy Clustering
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2601.14484