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Main Authors: Valcin, D., Rashkovetskyi, M., Seo, H., Beutler, F., McDonald, P., de Mattia, A., Rosado-Marín, A. J., Ross, A. J., Padmanabhan, N., Aguilar, J., Ahlen, S., Andrade, U., Bianchi, D., Brooks, D., Chaussidon, E., Chen, S., Chen, X., Claybaugh, T., Cuceu, A., Dawson, K. S., de la Macorra, A., Dey, Biprateep, Ding, Z., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Hahn, C., Honscheid, K., Howlett, C., Ishak, M., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Levi, M. E., Manera, M., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Nadathur, S., Paillas, E., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Ruggeri, R., Samushia, L., Sanchez, E., Saulder, C., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Yu, J., Zhou, R., Zou, H.
Format: Preprint
Published: 2025
Subjects:
Cosmology and Nongalactic Astrophysics
Online Access:https://arxiv.org/abs/2508.05467
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author Valcin, D.
Rashkovetskyi, M.
Seo, H.
Beutler, F.
McDonald, P.
de Mattia, A.
Rosado-Marín, A. J.
Ross, A. J.
Padmanabhan, N.
Aguilar, J.
Ahlen, S.
Andrade, U.
Bianchi, D.
Brooks, D.
Chaussidon, E.
Chen, S.
Chen, X.
Claybaugh, T.
Cuceu, A.
Dawson, K. S.
de la Macorra, A.
Dey, Biprateep
Ding, Z.
Doel, P.
Ferraro, S.
Font-Ribera, A.
Forero-Romero, J. E.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Hahn, C.
Honscheid, K.
Howlett, C.
Ishak, M.
Kehoe, R.
Kirkby, D.
Kisner, T.
Kremin, A.
Lahav, O.
Lambert, A.
Landriau, M.
Levi, M. E.
Manera, M.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Nadathur, S.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Prada, F.
Pérez-Ràfols, I.
Rossi, G.
Ruggeri, R.
Samushia, L.
Sanchez, E.
Saulder, C.
Schlegel, D.
Schubnell, M.
Silber, J.
Sprayberry, D.
Tarlé, G.
Weaver, B. A.
Yu, J.
Zhou, R.
Zou, H.
author_facet Valcin, D.
Rashkovetskyi, M.
Seo, H.
Beutler, F.
McDonald, P.
de Mattia, A.
Rosado-Marín, A. J.
Ross, A. J.
Padmanabhan, N.
Aguilar, J.
Ahlen, S.
Andrade, U.
Bianchi, D.
Brooks, D.
Chaussidon, E.
Chen, S.
Chen, X.
Claybaugh, T.
Cuceu, A.
Dawson, K. S.
de la Macorra, A.
Dey, Biprateep
Ding, Z.
Doel, P.
Ferraro, S.
Font-Ribera, A.
Forero-Romero, J. E.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Hahn, C.
Honscheid, K.
Howlett, C.
Ishak, M.
Kehoe, R.
Kirkby, D.
Kisner, T.
Kremin, A.
Lahav, O.
Lambert, A.
Landriau, M.
Levi, M. E.
Manera, M.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Nadathur, S.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Prada, F.
Pérez-Ràfols, I.
Rossi, G.
Ruggeri, R.
Samushia, L.
Sanchez, E.
Saulder, C.
Schlegel, D.
Schubnell, M.
Silber, J.
Sprayberry, D.
Tarlé, G.
Weaver, B. A.
Yu, J.
Zhou, R.
Zou, H.
contents This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overlapping tracers (galaxies of distinct types) in the same redshift range. We make a unified catalog of Luminous Red Galaxies (LRGs) and Emission Line Galaxies (ELGs) in the redshift range 0.8 < z < 1.1 and investigate the impact on the BAO constraints. DESI DR1 contains ~30% of the final DESI LRG sample and less than 25% of the final ELG sample, and the combination of LRGs and ELGs increases the number density and reduces the shot noise. We developed a pipeline to merge the overlapping tracers using galaxy bias as an approximately optimal weight and tested the pipeline on a suite of Abacus simulations, calibrated on the final version of the DESI Early Data Release. When applying our pipeline to the DESI DR1 catalog, we find an improvement in the BAO constraints of 11% for $α_\mathrm{iso}$ and ~7.0% for $α_\mathrm{AP}$ consistent with our findings in mock catalogs. Our analysis was integrated into the DESI DR1 BAO analysis to produce the LRG+ELG result in the 0.8 < z < 1.1 redshift bin, which provided the most precise BAO measurement from DESI DR1 with a 0.86% constraint on the BAO distance scale and a $9.1σ$ detection of the isotropic BAO feature.
format Preprint
id arxiv_https___arxiv_org_abs_2508_05467
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Combined tracer analysis for DESI 2024 BAO
Valcin, D.
Rashkovetskyi, M.
Seo, H.
Beutler, F.
McDonald, P.
de Mattia, A.
Rosado-Marín, A. J.
Ross, A. J.
Padmanabhan, N.
Aguilar, J.
Ahlen, S.
Andrade, U.
Bianchi, D.
Brooks, D.
Chaussidon, E.
Chen, S.
Chen, X.
Claybaugh, T.
Cuceu, A.
Dawson, K. S.
de la Macorra, A.
Dey, Biprateep
Ding, Z.
Doel, P.
Ferraro, S.
Font-Ribera, A.
Forero-Romero, J. E.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Hahn, C.
Honscheid, K.
Howlett, C.
Ishak, M.
Kehoe, R.
Kirkby, D.
Kisner, T.
Kremin, A.
Lahav, O.
Lambert, A.
Landriau, M.
Levi, M. E.
Manera, M.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Nadathur, S.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Prada, F.
Pérez-Ràfols, I.
Rossi, G.
Ruggeri, R.
Samushia, L.
Sanchez, E.
Saulder, C.
Schlegel, D.
Schubnell, M.
Silber, J.
Sprayberry, D.
Tarlé, G.
Weaver, B. A.
Yu, J.
Zhou, R.
Zou, H.
Cosmology and Nongalactic Astrophysics
This paper demonstrates how the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) and future baryon acoustic oscillations (BAO) analyses can optimally combine overlapping tracers (galaxies of distinct types) in the same redshift range. We make a unified catalog of Luminous Red Galaxies (LRGs) and Emission Line Galaxies (ELGs) in the redshift range 0.8 < z < 1.1 and investigate the impact on the BAO constraints. DESI DR1 contains ~30% of the final DESI LRG sample and less than 25% of the final ELG sample, and the combination of LRGs and ELGs increases the number density and reduces the shot noise. We developed a pipeline to merge the overlapping tracers using galaxy bias as an approximately optimal weight and tested the pipeline on a suite of Abacus simulations, calibrated on the final version of the DESI Early Data Release. When applying our pipeline to the DESI DR1 catalog, we find an improvement in the BAO constraints of 11% for $α_\mathrm{iso}$ and ~7.0% for $α_\mathrm{AP}$ consistent with our findings in mock catalogs. Our analysis was integrated into the DESI DR1 BAO analysis to produce the LRG+ELG result in the 0.8 < z < 1.1 redshift bin, which provided the most precise BAO measurement from DESI DR1 with a 0.86% constraint on the BAO distance scale and a $9.1σ$ detection of the isotropic BAO feature.
title Combined tracer analysis for DESI 2024 BAO
topic Cosmology and Nongalactic Astrophysics
url https://arxiv.org/abs/2508.05467

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