DESI DR1 Lyα 1D power spectrum: The Fast Fourier Transform estimator measurement
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| Format: | Preprint |
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2025
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| author | Ravoux, Corentin Abdul-Karim, Marie-Lynn Goff, Jean-Marc Le Armengaud, Eric Aguilar, Jessica N. Ahlen, Steven Bailey, Stephen Bianchi, Davide Brodzeller, Allyson Brooks, David Chaves-Montero, Jonás Claybaugh, Todd Cuceu, Andrei de Belsunce, Roger de la Macorra, Axel Dey, Arjun Ding, Zhejie Doel, Peter Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Karaçaylı, Naim Göksel Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Herrera-Alcantar, Hiram K. Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael E. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Montero-Camacho, Paulo Muñoz-Gutiérrez, Andrea Nadathur, Seshadri Niz, Gustavo Palanque-Delabrouille, Nathalie Pan, Zhiwei Percival, Will J. Pérez-Ràfols, Ignasi Pieri, Matthew M. Prada, Francisco Rossi, Graziano Sanchez, Eusebio Saulder, Christoph Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph H. Siudek, Małgorzata Sprayberry, David Tan, Ting Tang, Ji-Jia Tarlé, Gregory Walther, Michael Weaver, Benjamin A. Yèche, Christophe Yu, Jiaxi Zhou, Rongpu Zou, Hu |
| author_facet | Ravoux, Corentin Abdul-Karim, Marie-Lynn Goff, Jean-Marc Le Armengaud, Eric Aguilar, Jessica N. Ahlen, Steven Bailey, Stephen Bianchi, Davide Brodzeller, Allyson Brooks, David Chaves-Montero, Jonás Claybaugh, Todd Cuceu, Andrei de Belsunce, Roger de la Macorra, Axel Dey, Arjun Ding, Zhejie Doel, Peter Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Karaçaylı, Naim Göksel Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Herrera-Alcantar, Hiram K. Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael E. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Montero-Camacho, Paulo Muñoz-Gutiérrez, Andrea Nadathur, Seshadri Niz, Gustavo Palanque-Delabrouille, Nathalie Pan, Zhiwei Percival, Will J. Pérez-Ràfols, Ignasi Pieri, Matthew M. Prada, Francisco Rossi, Graziano Sanchez, Eusebio Saulder, Christoph Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph H. Siudek, Małgorzata Sprayberry, David Tan, Ting Tang, Ji-Jia Tarlé, Gregory Walther, Michael Weaver, Benjamin A. Yèche, Christophe Yu, Jiaxi Zhou, Rongpu Zou, Hu |
| contents | We present the one-dimensional Lyman-$α$ forest power spectrum measurement derived from the data release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). The measurement of the Lyman-$α$ forest power spectrum along the line of sight from high-redshift quasar spectra provides information on the shape of the linear matter power spectrum, neutrino masses, and the properties of dark matter. In this work, we use a Fast Fourier Transform (FFT)-based estimator, which is validated on synthetic data in a companion paper. Compared to the FFT measurement performed on the DESI early data release, we improve the noise characterization with a cross-exposure estimator and test the robustness of our measurement using various data splits. We also refine the estimation of the uncertainties and now present an estimator for the covariance matrix of the measurement. Furthermore, we compare our results to previous high-resolution and eBOSS measurements. In another companion paper, we present the same DR1 measurement using the Quadratic Maximum Likelihood Estimator (QMLE). These two measurements are consistent with each other and constitute the most precise one-dimensional power spectrum measurement to date, while being in good agreement with results from the DESI early data release. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_09493 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DESI DR1 Lyα 1D power spectrum: The Fast Fourier Transform estimator measurement Ravoux, Corentin Abdul-Karim, Marie-Lynn Goff, Jean-Marc Le Armengaud, Eric Aguilar, Jessica N. Ahlen, Steven Bailey, Stephen Bianchi, Davide Brodzeller, Allyson Brooks, David Chaves-Montero, Jonás Claybaugh, Todd Cuceu, Andrei de Belsunce, Roger de la Macorra, Axel Dey, Arjun Ding, Zhejie Doel, Peter Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Karaçaylı, Naim Göksel Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien Herrera-Alcantar, Hiram K. Ishak, Mustapha Kehoe, Robert Kirkby, David Kisner, Theodore Kremin, Anthony Landriau, Martin Guillou, Laurent Le Levi, Michael E. Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Montero-Camacho, Paulo Muñoz-Gutiérrez, Andrea Nadathur, Seshadri Niz, Gustavo Palanque-Delabrouille, Nathalie Pan, Zhiwei Percival, Will J. Pérez-Ràfols, Ignasi Pieri, Matthew M. Prada, Francisco Rossi, Graziano Sanchez, Eusebio Saulder, Christoph Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph H. Siudek, Małgorzata Sprayberry, David Tan, Ting Tang, Ji-Jia Tarlé, Gregory Walther, Michael Weaver, Benjamin A. Yèche, Christophe Yu, Jiaxi Zhou, Rongpu Zou, Hu Cosmology and Nongalactic Astrophysics We present the one-dimensional Lyman-$α$ forest power spectrum measurement derived from the data release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). The measurement of the Lyman-$α$ forest power spectrum along the line of sight from high-redshift quasar spectra provides information on the shape of the linear matter power spectrum, neutrino masses, and the properties of dark matter. In this work, we use a Fast Fourier Transform (FFT)-based estimator, which is validated on synthetic data in a companion paper. Compared to the FFT measurement performed on the DESI early data release, we improve the noise characterization with a cross-exposure estimator and test the robustness of our measurement using various data splits. We also refine the estimation of the uncertainties and now present an estimator for the covariance matrix of the measurement. Furthermore, we compare our results to previous high-resolution and eBOSS measurements. In another companion paper, we present the same DR1 measurement using the Quadratic Maximum Likelihood Estimator (QMLE). These two measurements are consistent with each other and constitute the most precise one-dimensional power spectrum measurement to date, while being in good agreement with results from the DESI early data release. |
| title | DESI DR1 Lyα 1D power spectrum: The Fast Fourier Transform estimator measurement |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.09493 |