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research article

First detection of the BAO signal from early DESI data

Moon, Jeongin
•
Valcin, David
•
Rashkovetskyi, Michael
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September 11, 2023
Monthly Notices Of The Royal Astronomical Society

We present the first detection of the baryon acoustic oscillations (BAOs) signal obtained using unblinded data collected during the initial 2 months of operations of the Stage-IV ground-based Dark Energy Spectroscopic Instrument (DESI). From a selected sample of 261 291 luminous red galaxies spanning the redshift interval 0.4 < z < 1.1 and covering 1651 square degrees with a 57.9 per cent completeness level, we report a similar to 5 sigma level BAO detection and the measurement of the BAO location at a precision of 1.7 per cent. Using a bright galaxy sample of 109 523 galaxies in the redshift range 0.1 < z < 0.5, over 3677 square degrees with a 50.0 per cent completeness, we also detect the BAO feature at similar to 3 sigma significance with a 2.6 per cent precision. These first BAO measurements represent an important milestone, acting as a quality control on the optimal performance of the complex robotically actuated, fibre-fed DESI spectrograph, as well as an early validation of the DESI spectroscopic pipeline and data management system. Based on these first promising results, we forecast that DESI is on target to achieve a high-significance BAO detection at sub-per cent precision with the completed 5-yr survey data, meeting the top-level science requirements on BAO measurements. This exquisite level of precision will set new standards in cosmology and confirm DESI as the most competitive BAO experiment for the remainder of this decade.

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Type
research article
DOI
10.1093/mnras/stad2618
Web of Science ID

WOS:001085055000006

Author(s)
Moon, Jeongin
•
Valcin, David
•
Rashkovetskyi, Michael
•
Saulder, Christoph
•
Aguilar, Jessica Nicole
•
Ahlen, Steven
•
Alam, Shadab
•
Bailey, Stephen
•
Baltay, Charles
•
Blum, Robert
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Date Issued

2023-09-11

Publisher

Oxford Univ Press

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

525

Issue

4

Start page

5406

End page

5422

Subjects

Physical Sciences

•

Galaxies: Statistics

•

Cosmology: Large-Scale Structure Of Universe, Observations, Dark Energy

•

Methods: Data Analysis, Statistical

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
FunderGrant Number

National Research Foundation of Korea (NRF) - Korean Ministry of Education, Science and Technology (MoEST)

2020R1A2C1005655

Sejong University

U.S. Department of Energy, Office of Science, Office of High Energy Physics

DE-SC0019091

Available on Infoscience
February 19, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/204046
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