Imagen de Portada

Dark Energy Survey Year 6 Results: Magnification modeling and its impact on galaxy clustering and galaxy-galaxy lensing cosmology

Fuente: arXiv

Guardado en:

Detalles Bibliográficos
Autores principales:	Legnani, E., Elvin-Poole, J., Anbajagane, D., Cid, D. Sanchez, Ferté, A., Weaverdyck, N., Porredon, A., Avila, S., Miquel, R., De Vicente, J., Coloma, J., Samuroff, S., d'Assignies, W., Alarcon, A., Sánchez, C., Muir, J., Prat, J., MacCrann, N., Bacon, D., Troxel, M. A., Chang, C., Crocce, M., Becker, M. R., Blazek, J., Yamamoto, M., Schutt, T., Rodriguez-Monroy, M., Giannini, G., Yin, B., Amon, A., Bechtol, K., Sevilla-Noarbe, I., Abbott, T. M. C., Aguena, M., Allam, S., Alves, O., Andrade-Oliveira, F., Bernstein, G. M., Bocquet, S., Brooks, D., Camilleri, R., Rosell, A. Carnero, Carretero, J., da Costa, L. N., Pereira, M. E. da Silva, Davis, T. M., Desai, S., Dodelson, S., Doel, P., Doux, C., García-Bellido, J., Gruen, D., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., Huterer, D., James, D. J., Kuehn, K., Lahav, O., Lee, S., Marshall, J. L., Mena-Fernández, J., Menanteau, F., Mohr, J. J., Myles, J., Ogando, R. L. C., Paterno, M., Malagón, A. A. Plazas, Rosenfeld, R., Sanchez, E., Smith, M., Soares-Santos, M., Suchyta, E., Vikram, V.
Formato:	Preprint
Publicado:	2026
Materias:	Cosmology and Nongalactic Astrophysics
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866912837328175104
author	Legnani, E. Elvin-Poole, J. Anbajagane, D. Cid, D. Sanchez Ferté, A. Weaverdyck, N. Porredon, A. Avila, S. Miquel, R. De Vicente, J. Coloma, J. Samuroff, S. d'Assignies, W. Alarcon, A. Sánchez, C. Muir, J. Prat, J. MacCrann, N. Bacon, D. Troxel, M. A. Chang, C. Crocce, M. Becker, M. R. Blazek, J. Yamamoto, M. Schutt, T. Rodriguez-Monroy, M. Giannini, G. Yin, B. Amon, A. Bechtol, K. Sevilla-Noarbe, I. Abbott, T. M. C. Aguena, M. Allam, S. Alves, O. Andrade-Oliveira, F. Bernstein, G. M. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Dodelson, S. Doel, P. Doux, C. García-Bellido, J. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Mohr, J. J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Rosenfeld, R. Sanchez, E. Smith, M. Soares-Santos, M. Suchyta, E. Vikram, V.
author_facet	Legnani, E. Elvin-Poole, J. Anbajagane, D. Cid, D. Sanchez Ferté, A. Weaverdyck, N. Porredon, A. Avila, S. Miquel, R. De Vicente, J. Coloma, J. Samuroff, S. d'Assignies, W. Alarcon, A. Sánchez, C. Muir, J. Prat, J. MacCrann, N. Bacon, D. Troxel, M. A. Chang, C. Crocce, M. Becker, M. R. Blazek, J. Yamamoto, M. Schutt, T. Rodriguez-Monroy, M. Giannini, G. Yin, B. Amon, A. Bechtol, K. Sevilla-Noarbe, I. Abbott, T. M. C. Aguena, M. Allam, S. Alves, O. Andrade-Oliveira, F. Bernstein, G. M. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Dodelson, S. Doel, P. Doux, C. García-Bellido, J. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Mohr, J. J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Rosenfeld, R. Sanchez, E. Smith, M. Soares-Santos, M. Suchyta, E. Vikram, V.
contents	Gravitational lensing magnification alters the observed spatial distribution of galaxies and must be accounted for to prevent biases in cosmological probes of the large-scale structure. We investigate its effects on the Dark Energy Survey Year 6 galaxy clustering and galaxy-galaxy lensing analyses using the fiducial lens (position tracer) sample MagLim++. Magnification bias is parameterized by a coefficient that describes the response of the number of selected objects per unlensed area element to a change in the lensing convergence. We quantify this coefficient using the Balrog synthetic source injection catalog to account for the complexity of the selection function, and compare these results with simplified estimates. The resulting values of the magnification coefficients for each redshift bin are [3.16 $\pm$ 0.08, 2.76 $\pm$ 0.21, 4.09 $\pm$ 0.15, 4.42 $\pm$ 0.16, 4.90 $\pm$ 0.29, 4.83 $\pm$ 0.25]. Relative to Year 3, this analysis provides more precise and accurate magnification bias estimates through a larger Balrog area and reweighting to better match the data properties. The cosmological results are robust when tested against various magnification parameter prior choices and also when adding cross-clustering between lens redshift bins. Neglecting magnification, however, introduces significant systematic shifts: relative to the fiducial analysis with Gaussian priors centered on the Balrog-derived estimates, we observe shifts of 1.37$σ$ in $S_8$ and -0.84$σ$ in $Ω_m$ (with cosmic shear included: -0.61$σ$ in $S_8$ and -0.71$σ$ in $Ω_m$), in agreement with findings from simulated data, demonstrating that magnification must be modeled to avoid biases. Freeing the magnification bias in lens bin 2 leads to unphysical negative values, further justifying its exclusion from the fiducial Year 6 analysis.
format	Preprint
id	arxiv_https___arxiv_org_abs_2601_14833
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Dark Energy Survey Year 6 Results: Magnification modeling and its impact on galaxy clustering and galaxy-galaxy lensing cosmology Legnani, E. Elvin-Poole, J. Anbajagane, D. Cid, D. Sanchez Ferté, A. Weaverdyck, N. Porredon, A. Avila, S. Miquel, R. De Vicente, J. Coloma, J. Samuroff, S. d'Assignies, W. Alarcon, A. Sánchez, C. Muir, J. Prat, J. MacCrann, N. Bacon, D. Troxel, M. A. Chang, C. Crocce, M. Becker, M. R. Blazek, J. Yamamoto, M. Schutt, T. Rodriguez-Monroy, M. Giannini, G. Yin, B. Amon, A. Bechtol, K. Sevilla-Noarbe, I. Abbott, T. M. C. Aguena, M. Allam, S. Alves, O. Andrade-Oliveira, F. Bernstein, G. M. Bocquet, S. Brooks, D. Camilleri, R. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. da Silva Davis, T. M. Desai, S. Dodelson, S. Doel, P. Doux, C. García-Bellido, J. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. Huterer, D. James, D. J. Kuehn, K. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Menanteau, F. Mohr, J. J. Myles, J. Ogando, R. L. C. Paterno, M. Malagón, A. A. Plazas Rosenfeld, R. Sanchez, E. Smith, M. Soares-Santos, M. Suchyta, E. Vikram, V. Cosmology and Nongalactic Astrophysics Gravitational lensing magnification alters the observed spatial distribution of galaxies and must be accounted for to prevent biases in cosmological probes of the large-scale structure. We investigate its effects on the Dark Energy Survey Year 6 galaxy clustering and galaxy-galaxy lensing analyses using the fiducial lens (position tracer) sample MagLim++. Magnification bias is parameterized by a coefficient that describes the response of the number of selected objects per unlensed area element to a change in the lensing convergence. We quantify this coefficient using the Balrog synthetic source injection catalog to account for the complexity of the selection function, and compare these results with simplified estimates. The resulting values of the magnification coefficients for each redshift bin are [3.16 $\pm$ 0.08, 2.76 $\pm$ 0.21, 4.09 $\pm$ 0.15, 4.42 $\pm$ 0.16, 4.90 $\pm$ 0.29, 4.83 $\pm$ 0.25]. Relative to Year 3, this analysis provides more precise and accurate magnification bias estimates through a larger Balrog area and reweighting to better match the data properties. The cosmological results are robust when tested against various magnification parameter prior choices and also when adding cross-clustering between lens redshift bins. Neglecting magnification, however, introduces significant systematic shifts: relative to the fiducial analysis with Gaussian priors centered on the Balrog-derived estimates, we observe shifts of 1.37$σ$ in $S_8$ and -0.84$σ$ in $Ω_m$ (with cosmic shear included: -0.61$σ$ in $S_8$ and -0.71$σ$ in $Ω_m$), in agreement with findings from simulated data, demonstrating that magnification must be modeled to avoid biases. Freeing the magnification bias in lens bin 2 leads to unphysical negative values, further justifying its exclusion from the fiducial Year 6 analysis.
title	Dark Energy Survey Year 6 Results: Magnification modeling and its impact on galaxy clustering and galaxy-galaxy lensing cosmology
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2601.14833