DOE OSTI · 2550639
Validation of the DESI DR2 Ly$\alpha$ BAO analysis using synthetic datasets
Abstract
The second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI), containing data from the first three years of observations, doubles the number of Lyman-$\alpha$ (Ly$\alpha$) forest spectra in DR1 and it provides the largest dataset of its kind. To ensure a robust validation of the Baryonic Acoustic Oscillation (BAO) analysis using Ly$\alpha$ forests, we have made significant updates compared to DR1 to both the mocks and the analysis framework used in the validation. In particular, we present CoLoRe-QL, a new set of Ly$\alpha$ mocks that use a quasi-linear input power spectrum to incorporate the non-linear broadening of the BAO peak. We have also increased the number of realisations used in the validation to 400, compared to the 150 realisations used in DR1. Finally, we present a detailed study of the impact of quasar redshift errors on the BAO measurement, and we compare different strategies to mask Damped Lyman-$\alpha$ Absorbers (DLAs) in our spectra. The BAO measurement from the Ly$\alpha$ dataset of DESI DR2 is presented in a companion publication.
Explore related subjects
Keep this discovery
Explore connections, maps & timelines
Casas, L. [Barcelona, IFAE], Herrera-Alcantar, H. K. [Paris, Inst. Astrophys.; IRFU, Saclay], Chaves-Montero, J. [Barcelona, IFAE], Cuceu, A. [LBNL, Berkeley; NASA, Goddard], Font-Ribera, A. [Barcelona, IFAE], Lokken, M. [Barcelona, IFAE], Abdul-Karim, M. [IRFU, Saclay], Ramírez-Pérez, C. [Barcelona, IFAE], Aguilar, J. [LBNL, Berkeley], Ahlen, S. [Boston U.], Andrade, U. [Michigan U., MCTP; Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.], Armengaud, E. [IRFU, Saclay], Aviles, A. [Mexico U., ICN; UNAM, CCF; UNAM, Mexico], Bailey, S. [LBNL, Berkeley], BenZvi, S. [Rochester U.], Bianchi, D. [Milan U.; Brera Observ.], Brodzeller, A. [LBNL, Berkeley], Brooks, D. [University Coll. London], Canning, R. [Portsmouth U., ICG], Carnero Rosell, A. [Laguna U., Tenerife; IAC, La Laguna], Charles, M. [Ohio State U.], Chaussidon, E. [LBNL, Berkeley], Claybaugh, T. [LBNL, Berkeley], Dawson, K. S. [Utah U.], de la Macorra, A. [UNAM, Mexico], de Mattia, A. [IRFU, Saclay], Dey, Arjun [Natl. Solar Observ., Tucson], Dey, Biprateep [Toronto U., Astron. Dept.; Pittsburgh U.], Ding, Z. [Beijing, GUCAS], Doel, P. [University Coll. London], Eisenstein, D. J. [Harvard-Smithsonian Ctr. Astrophys.], Elbers, W. [Durham U., ICC], Ferraro, S. [LBNL, Berkeley; UC, Berkeley, Math. Dept.] (ORCID:0000000349927854), Forero-Romero, J. E. [Andes U., Bogota], Garcia-Quintero, C. [Harvard-Smithsonian Ctr. Astrophys.; NASA, Goddard], Garrison, Lehman H. [Flatiron Inst., New York], Gaztañaga, E. [Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra], Gil-Marín, H. [ICC, Barcelona U.; U. Barcelona (main); Barcelona, IEEC], Gontcho A. Gontcho, S. [LBNL, Berkeley], Gonzalez-Morales, A. X. [Guanajuato U.], Gordon, C. [Barcelona, IFAE], Gutierrez, G. [Fermilab] (ORCID:0000000308250517), Guy, J. [LBNL, Berkeley], Herbold, M. [Ohio State U.], Honscheid, K. [Chicago U., KICP; Ohio State U.], Howlett, C. [Queensland U.], Huterer, D. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.], Ishak, M. [U. Texas, Dallas], Juneau, S. [Natl. Solar Observ., Tucson], Kehoe, R. [Southern Methodist U.], Kirkby, D. [UC, Irvine], Kisner, T. [LBNL, Berkeley], Kremin, A. [LBNL, Berkeley], Lahav, O. [University Coll. London], Landriau, M. [LBNL, Berkeley], Le Goff, J. M. [IRFU, Saclay], Le Guillou, L. [LPNHE, Paris], Leauthaud, A. [Lick Observ.; UC, Santa Cruz; UC, Santa Cruz, Inst. Part. Phys.], Levi, M. E. [LBNL, Berkeley], Li, Q. [Utah U.], Manera, M. [Barcelona, IFAE; Barcelona, Autonoma U.], Martini, P. [Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.], Meisner, A. [Natl. Solar Observ., Tucson], Mena-Fernández, J. [LPSC, Grenoble], Miquel, R. [ICREA, Barcelona; Barcelona, IFAE], Moustakas, J. [Siena Coll., Loudonville], Santos, D. Muñoz [Marseille, Lab. Astrophys.], Myers, A. D. [Wyoming U.], Nadathur, S. [Portsmouth U., ICG], Napolitano, L. [Wyoming U.], Niz, G. [Guanajuato U.; Mexico U., ICN] (ORCID:0000000215448946), Noriega, H. E. [UNAM, CCF; UNAM, Mexico] (ORCID:0000000233973998), Paillas, E. [Waterloo U.; Clemson U.; LSST, Tucson], Palanque-Delabrouille, N. [IRFU, Saclay; LBNL, Berkeley], Percival, W. J. [Waterloo U.; Perimeter Inst. Theor. Phys.], Pieri, Matthew M. [Marseille, Lab. Astrophys.], Poppett, C. [LBNL, Berkeley; UC, Berkeley (main); UC, Berkeley, Math. Dept.], Prada, F. [Granada U., Theor. Phys. Astrophys.], Pérez-Ràfols, I. [Barcelona, Polytechnic U.], Ravoux, C. [LPC, Clermont-Ferrand], Rossi, G. [Sejong U.], Sanchez, E. [Madrid, CIEMAT], Schlegel, D. [LBNL, Berkeley], Schubnell, M. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.], Seo, H. [Ohio U., Athens], Sinigaglia, F. [Laguna U., Tenerife; IAC, La Laguna], Sprayberry, D. [Natl. Solar Observ., Tucson], Tan, T. [IRFU, Saclay], Tarlé, G. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.], Taylor, P. [Ohio State U.], Turner, W. [Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.], Vargas-Magaña, M. [UNAM, Mexico], Walther, M. [Munich, Tech. U., Universe; Munich U.], Weaver, B. A. [Natl. Solar Observ., Tucson], Wolfson, M. [Ohio State U.], Yèche, C. [IRFU, Saclay], Zarrouk, P. [LPNHE, Paris], Zhou, R. [LBNL, Berkeley]. 2025-03-18. Validation of the DESI DR2 Ly$\alpha$ BAO analysis using synthetic datasets. https://doi.org/10.48550/arxiv.2503.14741
Cite the original work for its findings. Save a collection to share your selection of sources.