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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2023

The Dark Energy Spectroscopic Instrument: One-dimensional power spectrum from first Lyman-$\alpha$ forest samples with Fast Fourier Transform

Michael Walther
  • Function : Author
Naim Göksel Karaçaylı
  • Function : Author
Paul Martini
  • Function : Author
Julien Guy
  • Function : Author
Jessica Nicole Aguilar
  • Function : Author
Steven Ahlen
  • Function : Author
Stephen Bailey
  • Function : Author
Sergio Felipe Beltran
  • Function : Author
David Brooks
  • Function : Author
Laura Cabayol-Garcia
  • Function : Author
Solène Chabanier
  • Function : Author
Jonás Chaves-Montero
  • Function : Author
Kyle Dawson
  • Function : Author
Rodrigo de la Cruz
  • Function : Author
Axel de la Macorra
  • Function : Author
Peter Doel
  • Function : Author
Kevin Fanning
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Andreu Font-Ribera
  • Function : Author
Jaime Forero-Romero
  • Function : Author
Satya Gontcho A. Gontcho
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Alma X Gonzalez-Morales
  • Function : Author
Calum Gordon
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Hiram Herrera-Alcantar
  • Function : Author
Klaus Honscheid
  • Function : Author
Vid Iršič
  • Function : Author
Mustapha Ishak
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  • IdRef : 275024229
Robert Kehoe
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Theodore Kisner
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Anthony Kremin
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Martin Landriau
  • Function : Author
Michael Levi
  • Function : Author
Zarija Lukić
  • Function : Author
Aaron Meisner
  • Function : Author
Ramon Miquel
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John Moustakas
  • Function : Author
Eva-Maria Mueller
  • Function : Author
Andrea Muñoz-Gutiérrez
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Lucas Napolitano
  • Function : Author
Jundan Nie
  • Function : Author
Gustavo Niz
  • Function : Author
Will Percival
  • Function : Author
Ignasi Pérez-Ràfols
  • Function : Author
Claire Poppett
  • Function : Author
Francisco Prada
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César Ramírez Pérez
  • Function : Author
Graziano Rossi
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Eusebio Sanchez
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David Schlegel
  • Function : Author
Michael Schubnell
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Hee-Jong Seo
  • Function : Author
Francesco Sinigaglia
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Gregory Tarlé
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Ben Wang
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Benjamin Weaver
  • Function : Author
Zhimin Zhou
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Abstract

We present the one-dimensional Lyman-$\alpha$ forest power spectrum measurement using the first data provided by the Dark Energy Spectroscopic Instrument (DESI). The data sample comprises $26,330$ quasar spectra, at redshift $z > 2.1$, contained in the DESI Early Data Release and the first two months of the main survey. We employ a Fast Fourier Transform (FFT) estimator and compare the resulting power spectrum to an alternative likelihood-based method in a companion paper. We investigate methodological and instrumental contaminants associated to the new DESI instrument, applying techniques similar to previous Sloan Digital Sky Survey (SDSS) measurements. We use synthetic data based on log-normal approximation to validate and correct our measurement. We compare our resulting power spectrum with previous SDSS and high-resolution measurements. With relatively small number statistics, we successfully perform the FFT measurement, which is already competitive in terms of the scale range. At the end of the DESI survey, we expect a five times larger Lyman-$\alpha$ forest sample than SDSS, providing an unprecedented precise one-dimensional power spectrum measurement.
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hal-04143297 , version 1 (24-05-2024)

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Corentin Ravoux, Marie Lynn Abdul Karim, Eric Armengaud, Michael Walther, Naim Göksel Karaçaylı, et al.. The Dark Energy Spectroscopic Instrument: One-dimensional power spectrum from first Lyman-$\alpha$ forest samples with Fast Fourier Transform. Monthly Notices of the Royal Astronomical Society, 2023, 526 (4), pp.5118-5140. ⟨10.1093/mnras/stad3008⟩. ⟨hal-04143297⟩
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