Imagen de Portada

Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps $n(z)$ realizations for $3\times2$pt samples

Fuente: arXiv

Guardado en:

Detalles Bibliográficos
Autores principales:	d'Assignies, W., Bernstein, G. M., Yin, B., Giannini, G., Alarcon, A., Manera, M., To, C., Yamamoto, M., Weaverdyck, N., Cawthon, R., Gatti, M., Amon, A., Anbajagane, D., Avila, S., Becker, M. R., Bechtol, K., Chang, C., Crocce, M., De Vicente, J., Dodelson, S., Fang, J., Ferté, A., Gruen, D., Legnani, E., Porredon, A., Prat, J., Rodriguez-Monroy, M., Sánchez, C., Schutt, T., Sevilla-Noarbe, I., Cid, D. Sanchez, Troxel, M. A., Abbott, T. M. C., Andrade-Oliveira, F., Aguena, M., Alves, O., Bacon, D., Blazek, J., Bocquet, S., Brooks, D., Camilleri, R., Rosell, A. Carnero, Kind, M. Carrasco, Carretero, J., Castander, F. J., da Costa, L. N., Pereira, M. E. da Silva, Davis, T. M., Desai, S., Doel, P., Doux, C., Drlica-Wagner, A., Eifler, T., Elvin-Poole, J., Everett, S., Flaugher, B., Fosalba, P., Frieman, J., Garcia-Bellido, J., Gaztanaga, E., Giles, P., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Huterer, D., Jain, B., James, D. J., Kuehn, K., Lahav, O., Lee, S., Marshall, J. L., Mena-Fernandez, J., Menanteau, F., Miquel, R., Muir, J., Myles, J., Ogando, R. L. C., Palmese, A., Paterno, M., Petravick, P., Malagon, A. A. Plazas, Raveri, M., Roodman, A., Samuroff, S., Sanchez, E., Sheldon, E., Shin, T., Smith, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., Vikram, V., Walker, A. R.
Formato:	Preprint
Publicado:	2025
Materias:	Cosmology and Nongalactic Astrophysics
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866917293088309248
author	d'Assignies, W. Bernstein, G. M. Yin, B. Giannini, G. Alarcon, A. Manera, M. To, C. Yamamoto, M. Weaverdyck, N. Cawthon, R. Gatti, M. Amon, A. Anbajagane, D. Avila, S. Becker, M. R. Bechtol, K. Chang, C. Crocce, M. De Vicente, J. Dodelson, S. Fang, J. Ferté, A. Gruen, D. Legnani, E. Porredon, A. Prat, J. Rodriguez-Monroy, M. Sánchez, C. Schutt, T. Sevilla-Noarbe, I. Cid, D. Sanchez Troxel, M. A. Abbott, T. M. C. Andrade-Oliveira, F. Aguena, M. Alves, O. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Castander, F. J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Doel, P. Doux, C. Drlica-Wagner, A. Eifler, T. Elvin-Poole, J. Everett, S. Flaugher, B. Fosalba, P. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Giles, P. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. Jain, B. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernandez, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Palmese, A. Paterno, M. Petravick, P. Malagon, A. A. Plazas Raveri, M. Roodman, A. Samuroff, S. Sanchez, E. Sheldon, E. Shin, T. Smith, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Thomas, D. Vikram, V. Walker, A. R.
author_facet	d'Assignies, W. Bernstein, G. M. Yin, B. Giannini, G. Alarcon, A. Manera, M. To, C. Yamamoto, M. Weaverdyck, N. Cawthon, R. Gatti, M. Amon, A. Anbajagane, D. Avila, S. Becker, M. R. Bechtol, K. Chang, C. Crocce, M. De Vicente, J. Dodelson, S. Fang, J. Ferté, A. Gruen, D. Legnani, E. Porredon, A. Prat, J. Rodriguez-Monroy, M. Sánchez, C. Schutt, T. Sevilla-Noarbe, I. Cid, D. Sanchez Troxel, M. A. Abbott, T. M. C. Andrade-Oliveira, F. Aguena, M. Alves, O. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Castander, F. J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Doel, P. Doux, C. Drlica-Wagner, A. Eifler, T. Elvin-Poole, J. Everett, S. Flaugher, B. Fosalba, P. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Giles, P. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. Jain, B. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernandez, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Palmese, A. Paterno, M. Petravick, P. Malagon, A. A. Plazas Raveri, M. Roodman, A. Samuroff, S. Sanchez, E. Sheldon, E. Shin, T. Smith, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Thomas, D. Vikram, V. Walker, A. R.
contents	This work is part of a series establishing the redshift framework for the $3\times2$pt analysis of the Dark Energy Survey Year 6 (DES Y6). For DES Y6, photometric redshift distributions are estimated using self-organizing maps (SOMs), calibrated with spectroscopic and many-band photometric data. To overcome limitations from color-redshift degeneracies and incomplete spectroscopic coverage, we enhance this approach by incorporating clustering-based redshift constraints (clustering-z, or WZ) from angular cross-correlations with BOSS and eBOSS galaxies, and eBOSS quasar samples. We define a WZ likelihood and apply importance sampling to a large ensemble of SOM-derived $n(z)$ realizations, selecting those consistent with the clustering measurements to produce a posterior sample for each lens and source bin. The analysis uses angular scales of 1.5-5 Mpc to optimize signal-to-noise while mitigating modeling uncertainties, and marginalizes over redshift-dependent galaxy bias and other systematics informed by the N-body simulation Cardinal. While a sparser spectroscopic reference sample limits WZ constraining power at $z>1.1$, particularly for source bins, we demonstrate that combining SOMPZ with WZ improves redshift accuracy and enhances the overall cosmological constraining power of DES Y6. We estimate an improvement in $S_8$ of approximately 10\% for cosmic shear and $3\times2$pt analysis, primarily due to the WZ calibration of the source samples.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_23565
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps $n(z)$ realizations for $3\times2$pt samples d'Assignies, W. Bernstein, G. M. Yin, B. Giannini, G. Alarcon, A. Manera, M. To, C. Yamamoto, M. Weaverdyck, N. Cawthon, R. Gatti, M. Amon, A. Anbajagane, D. Avila, S. Becker, M. R. Bechtol, K. Chang, C. Crocce, M. De Vicente, J. Dodelson, S. Fang, J. Ferté, A. Gruen, D. Legnani, E. Porredon, A. Prat, J. Rodriguez-Monroy, M. Sánchez, C. Schutt, T. Sevilla-Noarbe, I. Cid, D. Sanchez Troxel, M. A. Abbott, T. M. C. Andrade-Oliveira, F. Aguena, M. Alves, O. Bacon, D. Blazek, J. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Kind, M. Carrasco Carretero, J. Castander, F. J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Doel, P. Doux, C. Drlica-Wagner, A. Eifler, T. Elvin-Poole, J. Everett, S. Flaugher, B. Fosalba, P. Frieman, J. Garcia-Bellido, J. Gaztanaga, E. Giles, P. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. Jain, B. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernandez, J. Menanteau, F. Miquel, R. Muir, J. Myles, J. Ogando, R. L. C. Palmese, A. Paterno, M. Petravick, P. Malagon, A. A. Plazas Raveri, M. Roodman, A. Samuroff, S. Sanchez, E. Sheldon, E. Shin, T. Smith, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Thomas, D. Vikram, V. Walker, A. R. Cosmology and Nongalactic Astrophysics This work is part of a series establishing the redshift framework for the $3\times2$pt analysis of the Dark Energy Survey Year 6 (DES Y6). For DES Y6, photometric redshift distributions are estimated using self-organizing maps (SOMs), calibrated with spectroscopic and many-band photometric data. To overcome limitations from color-redshift degeneracies and incomplete spectroscopic coverage, we enhance this approach by incorporating clustering-based redshift constraints (clustering-z, or WZ) from angular cross-correlations with BOSS and eBOSS galaxies, and eBOSS quasar samples. We define a WZ likelihood and apply importance sampling to a large ensemble of SOM-derived $n(z)$ realizations, selecting those consistent with the clustering measurements to produce a posterior sample for each lens and source bin. The analysis uses angular scales of 1.5-5 Mpc to optimize signal-to-noise while mitigating modeling uncertainties, and marginalizes over redshift-dependent galaxy bias and other systematics informed by the N-body simulation Cardinal. While a sparser spectroscopic reference sample limits WZ constraining power at $z>1.1$, particularly for source bins, we demonstrate that combining SOMPZ with WZ improves redshift accuracy and enhances the overall cosmological constraining power of DES Y6. We estimate an improvement in $S_8$ of approximately 10\% for cosmic shear and $3\times2$pt analysis, primarily due to the WZ calibration of the source samples.
title	Dark Energy Survey Year 6 Results: Clustering-redshifts and importance sampling of Self-Organised-Maps $n(z)$ realizations for $3\times2$pt samples
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2510.23565