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DESI DR2 reference mocks: clustering results from Uchuu-BGS and LRG

Fuente: arXiv

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Autori principali:	Fernández-García, E., Prada, F., Smith, A., DeRose, J., Ross, A. J., Bailey, S., Wang, M. S., Ding, Z., Guandalin, C., Lamman, C., Vaisakh, R., Kehoe, R., Lasker, J., Ishiyama, T., Moore, S. M., Cole, S., Siudek, M., Amalbert, A., Salcedo, A., Hearin, A., Joachimi, B., Rocher, A., Saito, S., Krolewski, A., Slepian, Z., Li, Q., Dawson, K. S., Jullo, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., de la Macorra, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S. Gontcho A, Gutierrez, G., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Levi, M. E., Manera, M., Miquel, R., Moustakas, J., Nadathur, S., Percival, W. J., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zarrouk, P., Zhou, R.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
Accesso online:	Acceder al recurso
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_version_	1866917316818632704
author	Fernández-García, E. Prada, F. Smith, A. DeRose, J. Ross, A. J. Bailey, S. Wang, M. S. Ding, Z. Guandalin, C. Lamman, C. Vaisakh, R. Kehoe, R. Lasker, J. Ishiyama, T. Moore, S. M. Cole, S. Siudek, M. Amalbert, A. Salcedo, A. Hearin, A. Joachimi, B. Rocher, A. Saito, S. Krolewski, A. Slepian, Z. Li, Q. Dawson, K. S. Jullo, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Levi, M. E. Manera, M. Miquel, R. Moustakas, J. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R.
author_facet	Fernández-García, E. Prada, F. Smith, A. DeRose, J. Ross, A. J. Bailey, S. Wang, M. S. Ding, Z. Guandalin, C. Lamman, C. Vaisakh, R. Kehoe, R. Lasker, J. Ishiyama, T. Moore, S. M. Cole, S. Siudek, M. Amalbert, A. Salcedo, A. Hearin, A. Joachimi, B. Rocher, A. Saito, S. Krolewski, A. Slepian, Z. Li, Q. Dawson, K. S. Jullo, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Levi, M. E. Manera, M. Miquel, R. Moustakas, J. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R.
contents	The aim of this work is to construct mock galaxy catalogues that accurately reproduce the redshift evolution of galaxy number density, clustering statistics, and baryonic properties, such as stellar mass for luminous red galaxies (LRGs) and absolute magnitude in the $r$-band for the bright galaxy sample (BGS), based on the first three years of observations from the Dark Energy Spectroscopic Instrument (DESI). To achieve this, we applied the subhalo abundance matching (SHAM) technique to the Uchuu $N$-body simulation, which follows the evolution of 2.1 trillion particles within a volume of $8\,h^{-3}\,\mathrm{Gpc}^{3}$, assuming a Planck base-$Λ$CDM cosmology. Using SHAM, we populated Uchuu subhalos with LRGs and BGS-BRIGHT ($r<19.5$) galaxies up to redshift $z=1.1$, assigning stellar masses to LRGs and luminosities to BGS galaxies (up to $M_{\rm r}\leq 20$). Furthermore, we analyzed the clustering dependence on stellar mass and luminosity for each tracer. Our results show that the Uchuu BGS-BRIGHT and LRG mocks accurately reproduce the observed redshift evolution of clustering, with better than 5\% agreement for separations of $1<r<20\,h^{-1}\,\mathrm{Mpc}$ and below 10\% for $0.1<r<1\,h^{-1}\,\mathrm{Mpc}$. For the Uchuu-LRG mock, we successfully captured the stellar mass dependence of clustering, while for the Uchuu-BGS mock, we replicated the clustering for various volume-limited subsamples. We also find good agreement between the data and mocks in the dependence of large-scale bias on luminosity for BGS-BRIGHT galaxies and on stellar mass for LRGs. Altogether, these results equip DESI with robust tools for generating high-fidelity lightcones for the remainder of the survey, thereby enhancing our understanding of the galaxy--halo connection.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_01593
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	DESI DR2 reference mocks: clustering results from Uchuu-BGS and LRG Fernández-García, E. Prada, F. Smith, A. DeRose, J. Ross, A. J. Bailey, S. Wang, M. S. Ding, Z. Guandalin, C. Lamman, C. Vaisakh, R. Kehoe, R. Lasker, J. Ishiyama, T. Moore, S. M. Cole, S. Siudek, M. Amalbert, A. Salcedo, A. Hearin, A. Joachimi, B. Rocher, A. Saito, S. Krolewski, A. Slepian, Z. Li, Q. Dawson, K. S. Jullo, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Juneau, S. Kirkby, D. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Levi, M. E. Manera, M. Miquel, R. Moustakas, J. Nadathur, S. Percival, W. J. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zarrouk, P. Zhou, R. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The aim of this work is to construct mock galaxy catalogues that accurately reproduce the redshift evolution of galaxy number density, clustering statistics, and baryonic properties, such as stellar mass for luminous red galaxies (LRGs) and absolute magnitude in the $r$-band for the bright galaxy sample (BGS), based on the first three years of observations from the Dark Energy Spectroscopic Instrument (DESI). To achieve this, we applied the subhalo abundance matching (SHAM) technique to the Uchuu $N$-body simulation, which follows the evolution of 2.1 trillion particles within a volume of $8\,h^{-3}\,\mathrm{Gpc}^{3}$, assuming a Planck base-$Λ$CDM cosmology. Using SHAM, we populated Uchuu subhalos with LRGs and BGS-BRIGHT ($r<19.5$) galaxies up to redshift $z=1.1$, assigning stellar masses to LRGs and luminosities to BGS galaxies (up to $M_{\rm r}\leq 20$). Furthermore, we analyzed the clustering dependence on stellar mass and luminosity for each tracer. Our results show that the Uchuu BGS-BRIGHT and LRG mocks accurately reproduce the observed redshift evolution of clustering, with better than 5\% agreement for separations of $1<r<20\,h^{-1}\,\mathrm{Mpc}$ and below 10\% for $0.1<r<1\,h^{-1}\,\mathrm{Mpc}$. For the Uchuu-LRG mock, we successfully captured the stellar mass dependence of clustering, while for the Uchuu-BGS mock, we replicated the clustering for various volume-limited subsamples. We also find good agreement between the data and mocks in the dependence of large-scale bias on luminosity for BGS-BRIGHT galaxies and on stellar mass for LRGs. Altogether, these results equip DESI with robust tools for generating high-fidelity lightcones for the remainder of the survey, thereby enhancing our understanding of the galaxy--halo connection.
title	DESI DR2 reference mocks: clustering results from Uchuu-BGS and LRG
topic	Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2507.01593