First detection of the BAO signal from early DESI data
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- Sejong Univ., Seoul (Korea, Republic of)
- Ohio Univ., Athens, OH (United States)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Korea Astronomy and Space Science Institute (KASI), Daejeon (Korea, Republic of)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Boston Univ., MA (United States)
- Tata Inst. of Fundamental Research, Bombay (India)
- Yale Univ., New Haven, CT (United States)
- National Optical-Infrared Astronomy Research Laboratory (NOIRLab), Tucson, AZ (United States)
- Univ. College London (United Kingdom)
- Univ. Paris-Saclay, Gif-sur-Yvette (France); Alternative Energies and Atomic Energy Commission (CEA), Saclay (France)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. Nacional Autonoma de Mexico (UNAM), Mexico City (Mexico)
- Southern Methodist Univ., Dallas, TX (United States)
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Barcelona Institute of Science and Technology (BIST) (Spain)
- Universidad de los Andes (Colombia)
- Univ. of Texas at Dallas, Richardson, TX (United States)
- Univ. of Michigan, Ann Arbor, MI (United States)
- The Ohio State Univ., Columbus, OH (United States)
- University of Seoul (Korea, Republic of)
- Lab. Nuclear Physics and High Energies (LPNHE), Paris (France); Centre National de la Recherche Scientifique (CNRS) (France); Sorbonne Univ., Paris (France)
- Univ. Autonoma de Barcelona (Spain)
- Barcelona Institute of Science and Technology (Spain); Catalan Institution for Research and Advanced Studies (ICREA) (Spain)
- Siena College, Loudonville, NY (United States)
- Univ. of Wyoming, Laramie, WY (United States)
- Univ. of Portsmouth (United Kingdom)
- Univ. of Edinburgh, Scotland (United Kingdom)
- Univ. of Pittsburgh, PA (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Alternative Energies and Atomic Energy Commission (CEA), Saclay (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
- Univ. of Waterloo, ON (Canada); Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Consejo Superior de Investigaciones Cientificas (CSIC) (Spain)
- Kansas State Univ., Manhattan, KS (United States)
- Ecole Polytechnique Fédérale de Lausanne (Switzerland)
- Univ. of California, Berkeley, CA (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
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 ∼5σ 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 ∼3σ 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.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Ohio University, Athens, OH (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- US Department of Energy; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Grant/Contract Number:
- AC02-05CH11231; AC02-07CH11359; SC0007881; SC0019091; SC0023241
- OSTI ID:
- 2000179
- Report Number(s):
- FERMILAB-PUB-23-199-PPD; oai:inspirehep.net:2651986; arXiv:2304.08427
- Journal Information:
- Mon.Not.Roy.Astron.Soc., Journal Name: Mon.Not.Roy.Astron.Soc. Journal Issue: 4 Vol. 525; ISSN 0035-8711
- Publisher:
- Oxford University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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