Buchumschlag

DESI DR1 Ly$α$ 1D power spectrum: The optimal estimator measurement

Fuente: arXiv

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Bibliographische Detailangaben
Hauptverfasser:	Karaçaylı, N. G., Martini, P., Aguilar, J., Ahlen, S., Armengaud, E., Bailey, S., Bault, A., Bianchi, D., Brodzeller, A., Brooks, D., Chaves-Montero, J., Claybaugh, T., Cuceu, A., de la Macorra, A., Dey, A., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Kehoe, R., Kirkby, D., Kremin, A., Landriau, M., Goff, J. M. Le, Guillou, L. Le, Levi, M. E., Manera, M., Meisner, A., Miquel, R., Montero-Camacho, P., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Pan, Z., Percival, W. J., Pieri, Matthew M., Prada, F., Pérez-Ràfols, I., Ravoux, C., Rossi, G., Sanchez, E., Saulder, C., Schlegel, D., Schubnell, M., Seo, H., Siudek, M., Sprayberry, D., Tan, T., Tang, Ji-Jia, Tarlé, G., Walther, M., Weaver, B. A., Yu, J., Zhou, R., Zou, H.
Format:	Preprint
Veröffentlicht:	2025
Schlagworte:	Cosmology and Nongalactic Astrophysics
Online-Zugang:	Acceder al recurso
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author	Karaçaylı, N. G. Martini, P. Aguilar, J. Ahlen, S. Armengaud, E. Bailey, S. Bault, A. Bianchi, D. Brodzeller, A. Brooks, D. Chaves-Montero, J. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Goff, J. M. Le Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Montero-Camacho, P. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Pan, Z. Percival, W. J. Pieri, Matthew M. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Saulder, C. Schlegel, D. Schubnell, M. Seo, H. Siudek, M. Sprayberry, D. Tan, T. Tang, Ji-Jia Tarlé, G. Walther, M. Weaver, B. A. Yu, J. Zhou, R. Zou, H.
author_facet	Karaçaylı, N. G. Martini, P. Aguilar, J. Ahlen, S. Armengaud, E. Bailey, S. Bault, A. Bianchi, D. Brodzeller, A. Brooks, D. Chaves-Montero, J. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Goff, J. M. Le Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Montero-Camacho, P. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Pan, Z. Percival, W. J. Pieri, Matthew M. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Saulder, C. Schlegel, D. Schubnell, M. Seo, H. Siudek, M. Sprayberry, D. Tan, T. Tang, Ji-Jia Tarlé, G. Walther, M. Weaver, B. A. Yu, J. Zhou, R. Zou, H.
contents	The one-dimensional power spectrum $P_{\mathrm{1D}}$ of Ly$α$ forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergalactic medium. We present the measurement of $P_{\mathrm{1D}}$ using the optimal quadratic maximum likelihood estimator applied to over 300,000 Ly$α$ quasars from Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) survey. This sample represents the largest to date for $P_{\mathrm{1D}}$ measurements and is larger than the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) by a factor of 1.7. We conduct a meticulous investigation of instrumental and analysis systematics and quantify their impact on $P_{\mathrm{1D}}$. This includes the development of a cross-exposure estimator that eliminates the need to model the pipeline noise and has strong potential for future $P_{\mathrm{1D}}$ measurements. We also present new insights into metal contamination through the 1D correlation function. Using a fitting function we measure the evolution of the Ly$α$ forest bias with high precision: $b_F(z) = (-0.218\pm0.002)\times((1 + z) / 4)^{2.96\pm0.06}$. In a companion validation paper, we substantially extend our previous suite of CCD image simulations to quantify the pipeline's exquisite performance accurately. In another companion paper, we present DR1 $P_{\mathrm{1D}}$ measurements using the Fast Fourier Transform (FFT) approach to power spectrum estimation. These two measurements produce a forest bias parameter that differs by 2.2 sigma. However, our model is simplistic, so this disagreement will be investigated in future work.
format	Preprint
id	arxiv_https___arxiv_org_abs_2505_07974
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	DESI DR1 Ly$α$ 1D power spectrum: The optimal estimator measurement Karaçaylı, N. G. Martini, P. Aguilar, J. Ahlen, S. Armengaud, E. Bailey, S. Bault, A. Bianchi, D. Brodzeller, A. Brooks, D. Chaves-Montero, J. Claybaugh, T. Cuceu, A. de la Macorra, A. Dey, A. Dey, B. Doel, P. Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Hahn, C. Herrera-Alcantar, H. K. Honscheid, K. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Goff, J. M. Le Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Montero-Camacho, P. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Pan, Z. Percival, W. J. Pieri, Matthew M. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Saulder, C. Schlegel, D. Schubnell, M. Seo, H. Siudek, M. Sprayberry, D. Tan, T. Tang, Ji-Jia Tarlé, G. Walther, M. Weaver, B. A. Yu, J. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics The one-dimensional power spectrum $P_{\mathrm{1D}}$ of Ly$α$ forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergalactic medium. We present the measurement of $P_{\mathrm{1D}}$ using the optimal quadratic maximum likelihood estimator applied to over 300,000 Ly$α$ quasars from Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) survey. This sample represents the largest to date for $P_{\mathrm{1D}}$ measurements and is larger than the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) by a factor of 1.7. We conduct a meticulous investigation of instrumental and analysis systematics and quantify their impact on $P_{\mathrm{1D}}$. This includes the development of a cross-exposure estimator that eliminates the need to model the pipeline noise and has strong potential for future $P_{\mathrm{1D}}$ measurements. We also present new insights into metal contamination through the 1D correlation function. Using a fitting function we measure the evolution of the Ly$α$ forest bias with high precision: $b_F(z) = (-0.218\pm0.002)\times((1 + z) / 4)^{2.96\pm0.06}$. In a companion validation paper, we substantially extend our previous suite of CCD image simulations to quantify the pipeline's exquisite performance accurately. In another companion paper, we present DR1 $P_{\mathrm{1D}}$ measurements using the Fast Fourier Transform (FFT) approach to power spectrum estimation. These two measurements produce a forest bias parameter that differs by 2.2 sigma. However, our model is simplistic, so this disagreement will be investigated in future work.
title	DESI DR1 Ly$α$ 1D power spectrum: The optimal estimator measurement
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2505.07974