Optimal 1D Ly$\alpha$ Forest Power Spectrum Estimation -- III. DESI early data
Abstract
The one-dimensional power spectrum of the Ly forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark matter models, the sum of the masses of the three neutrino species, and the thermal state of the intergalactic medium. We present the first measurement of with the quadratic maximum likelihood estimator (QMLE) from the Dark Energy Spectroscopic Instrument (DESI) survey early data sample. This early sample of quasars is already comparable in size to the largest previous studies, and we conduct a thorough investigation of numerous instrumental and analysis systematic errors to evaluate their impact on DESI data with QMLE. We demonstrate the excellent performance of the spectroscopic pipeline noise estimation and the impressive accuracy of the spectrograph resolution matrix with two-dimensional image simulations of raw DESI images that we processed with the DESI spectroscopic pipeline. We also study metal line contamination and noise calibration systematics with quasar spectra on the red side of the Ly emission line. In a companion paper, we present a similar analysis based on the Fast Fourier Transform estimate of the power spectrum. We conclude with a comparison of these two approaches and implications for the upcoming DESI Year 1 analysis.
Cite
@article{arxiv.2306.06316,
title = {Optimal 1D Ly$\alpha$ Forest Power Spectrum Estimation -- III. DESI early data},
author = {Naim Göksel Karaçaylı and Paul Martini and Julien Guy and Corentin Ravoux and Marie Lynn Abdul-Karim and Eric Armengaud and Michael Walther and J. Aguilar and S. Ahlen and S. Bailey and J. Bautista and S. F. Beltran and D. Brooks and L. Cabayol-Garcia and S. Chabanier and E. Chaussidon and J. Chaves-Montero and K. Dawson and R. de la Cruz and A. de la Macorra and P. Doel and A. Font-Ribera and J. E. Forero-Romero and S. Gontcho A Gontcho and A. X. Gonzalez-Morales and C. Gordon and H. K Herrera-Alcantar and K. Honscheid and V. Iršič and M. Ishak and R. Kehoe and T. Kisner and A. Kremin and M. Landriau and L. Le Guillou and M. E. Levi and Z. Lukić and A. Meisner and R. Miquel and J. Moustakas and E. Mueller and A. Muñoz-Gutiérrez and L. Napolitano and J. Nie and G. Niz and N. Palanque-Delabrouille and W. J. Percival and M. Pieri and C. Poppett and F. Prada and I. Pérez-Ràfols and C. Ramírez-Pérez and G. Rossi and E. Sanchez and H. Seo and F. Sinigaglia and T. Tan and G. Tarlé and B. Wang and B. A. Weaver and C. Yèche and Z. Zhou},
journal= {arXiv preprint arXiv:2306.06316},
year = {2025}
}
Comments
23 pages, 20 figures. To be published in MNRAS