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Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis

Fuente: arXiv
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Auteurs principaux: Pérez-Fernández, A., Medina-Varela, L., Ruggeri, R., Vargas-Magaña, M., Seo, H., Padmanabhan, N., Ishak, M., Aguilar, J., Ahlen, S., Alam, S., Alves, O., Andrade, U., Brieden, S., Brooks, D., Rosell, A. Carnero, Chen, X., Claybaugh, T., Cole, S., Dawson, K., de la Macorra, A., de Mattia, A., Dey, Arjun, Ding, Z., Doel, P., Fanning, K., Garcia-Quintero, C., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Honscheid, K., Juneau, S., Kirkby, D., Kisner, T., Lambert, A., Landriau, M., Lasker, J., Guillou, L. Le, Manera, M., Martini, P., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Myers, A. D., Nadathur, S., Newman, J. A., Niz, G., Paillas, E., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Rashkovetskyi, M., Rocher, A., Rossi, G., Sanchez, A., Sanchez, E., Schubnell, M., Sprayberry, D., Tarlé, G., Valcin, D., Weaver, B. A., Yu, J., Zou, H.
Format: Preprint
Publié: 2024
Sujets:
Cosmology and Nongalactic Astrophysics
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author Pérez-Fernández, A.
Medina-Varela, L.
Ruggeri, R.
Vargas-Magaña, M.
Seo, H.
Padmanabhan, N.
Ishak, M.
Aguilar, J.
Ahlen, S.
Alam, S.
Alves, O.
Andrade, U.
Brieden, S.
Brooks, D.
Rosell, A. Carnero
Chen, X.
Claybaugh, T.
Cole, S.
Dawson, K.
de la Macorra, A.
de Mattia, A.
Dey, Arjun
Ding, Z.
Doel, P.
Fanning, K.
Garcia-Quintero, C.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Honscheid, K.
Juneau, S.
Kirkby, D.
Kisner, T.
Lambert, A.
Landriau, M.
Lasker, J.
Guillou, L. Le
Manera, M.
Martini, P.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Myers, A. D.
Nadathur, S.
Newman, J. A.
Niz, G.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Poppett, C.
Prada, F.
Rashkovetskyi, M.
Rocher, A.
Rossi, G.
Sanchez, A.
Sanchez, E.
Schubnell, M.
Sprayberry, D.
Tarlé, G.
Valcin, D.
Weaver, B. A.
Yu, J.
Zou, H.
author_facet Pérez-Fernández, A.
Medina-Varela, L.
Ruggeri, R.
Vargas-Magaña, M.
Seo, H.
Padmanabhan, N.
Ishak, M.
Aguilar, J.
Ahlen, S.
Alam, S.
Alves, O.
Andrade, U.
Brieden, S.
Brooks, D.
Rosell, A. Carnero
Chen, X.
Claybaugh, T.
Cole, S.
Dawson, K.
de la Macorra, A.
de Mattia, A.
Dey, Arjun
Ding, Z.
Doel, P.
Fanning, K.
Garcia-Quintero, C.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Honscheid, K.
Juneau, S.
Kirkby, D.
Kisner, T.
Lambert, A.
Landriau, M.
Lasker, J.
Guillou, L. Le
Manera, M.
Martini, P.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Myers, A. D.
Nadathur, S.
Newman, J. A.
Niz, G.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Poppett, C.
Prada, F.
Rashkovetskyi, M.
Rocher, A.
Rossi, G.
Sanchez, A.
Sanchez, E.
Schubnell, M.
Sprayberry, D.
Tarlé, G.
Valcin, D.
Weaver, B. A.
Yu, J.
Zou, H.
contents When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also when defining input parameters for the reconstruction algorithm. A parameterised template for the model to be fitted is also created based on a (possibly different) fiducial cosmology. This model reliance can be considered a form of data compression, and the data is then analysed allowing that the true answer is different from the fiducial cosmology assumed. In this study, we evaluate the impact of the fiducial cosmology assumed in the BAO analysis of the Dark Energy Spectroscopic Instrument (DESI) survey Data Release 1 (DR1) on the final measurements in DESI 2024 III. We utilise a suite of mock galaxy catalogues with survey realism that mirrors the DESI DR1 tracers: the bright galaxy sample (BGS), the luminous red galaxies (LRG), the emission line galaxies (ELG) and the quasars (QSO), spanning a redshift range from 0.1 to 2.1. We compare the four secondary AbacusSummit cosmologies against DESI's fiducial cosmology (Planck 2018). The secondary cosmologies explored include a lower cold dark matter density, a thawing dark energy universe, a higher number of effective species, and a lower amplitude of matter clustering. The mocks are processed through the BAO pipeline by consistently iterating the grid, template, and reconstruction reference cosmologies. We determine a conservative systematic contribution to the error of $0.1\%$ for both the isotropic and anisotropic dilation parameters $α_{\rm iso}$ and $α_{\rm AP}$. We then directly test the impact of the fiducial cosmology on DESI DR1 data.
format Preprint
id arxiv_https___arxiv_org_abs_2406_06085
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis
Pérez-Fernández, A.
Medina-Varela, L.
Ruggeri, R.
Vargas-Magaña, M.
Seo, H.
Padmanabhan, N.
Ishak, M.
Aguilar, J.
Ahlen, S.
Alam, S.
Alves, O.
Andrade, U.
Brieden, S.
Brooks, D.
Rosell, A. Carnero
Chen, X.
Claybaugh, T.
Cole, S.
Dawson, K.
de la Macorra, A.
de Mattia, A.
Dey, Arjun
Ding, Z.
Doel, P.
Fanning, K.
Garcia-Quintero, C.
Gaztañaga, E.
Gontcho, S. Gontcho A
Gutierrez, G.
Honscheid, K.
Juneau, S.
Kirkby, D.
Kisner, T.
Lambert, A.
Landriau, M.
Lasker, J.
Guillou, L. Le
Manera, M.
Martini, P.
Meisner, A.
Mena-Fernández, J.
Miquel, R.
Moustakas, J.
Myers, A. D.
Nadathur, S.
Newman, J. A.
Niz, G.
Paillas, E.
Palanque-Delabrouille, N.
Percival, W. J.
Poppett, C.
Prada, F.
Rashkovetskyi, M.
Rocher, A.
Rossi, G.
Sanchez, A.
Sanchez, E.
Schubnell, M.
Sprayberry, D.
Tarlé, G.
Valcin, D.
Weaver, B. A.
Yu, J.
Zou, H.
Cosmology and Nongalactic Astrophysics
When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also when defining input parameters for the reconstruction algorithm. A parameterised template for the model to be fitted is also created based on a (possibly different) fiducial cosmology. This model reliance can be considered a form of data compression, and the data is then analysed allowing that the true answer is different from the fiducial cosmology assumed. In this study, we evaluate the impact of the fiducial cosmology assumed in the BAO analysis of the Dark Energy Spectroscopic Instrument (DESI) survey Data Release 1 (DR1) on the final measurements in DESI 2024 III. We utilise a suite of mock galaxy catalogues with survey realism that mirrors the DESI DR1 tracers: the bright galaxy sample (BGS), the luminous red galaxies (LRG), the emission line galaxies (ELG) and the quasars (QSO), spanning a redshift range from 0.1 to 2.1. We compare the four secondary AbacusSummit cosmologies against DESI's fiducial cosmology (Planck 2018). The secondary cosmologies explored include a lower cold dark matter density, a thawing dark energy universe, a higher number of effective species, and a lower amplitude of matter clustering. The mocks are processed through the BAO pipeline by consistently iterating the grid, template, and reconstruction reference cosmologies. We determine a conservative systematic contribution to the error of $0.1\%$ for both the isotropic and anisotropic dilation parameters $α_{\rm iso}$ and $α_{\rm AP}$. We then directly test the impact of the fiducial cosmology on DESI DR1 data.
title Fiducial-Cosmology-dependent systematics for the DESI 2024 BAO Analysis
topic Cosmology and Nongalactic Astrophysics
url https://arxiv.org/abs/2406.06085

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