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Peer-reviewedCC BY 4.0The Astrophysical Journal

Baryon Acoustic Oscillations from the C iv Forest with DESI DR2

  • Abby Bault1
  • Andrei Cuceu1
  • Julien Guy1
  • J. Aguilar1
  • S. Ahlen2
  • D. Bianchi3,4
  • A. Brodzeller1
  • D. Brooks5
  • R. Canning6
  • E. Chaussidon1
  • T. Claybaugh1
  • R. de Belsunce1
44 more authors
  • A. de la Macorra7
  • Arjun Dey8
  • P. Doel5
  • S. Ferraro1,9
  • A. Font-Ribera10,11
  • J. E. Forero-Romero12
  • E. Gaztañaga6,13,14
  • S. Gontcho A Gontcho1,15
  • C. Gordon5
  • D. Green1
  • G. Gutierrez16
  • C. Hahn17
  • H. K. Herrera-Alcantar18,19
  • K. Honscheid20
  • M. Ishak21
  • R. Joyce8
  • S. Juneau8
  • D. Kirkby22
  • A. Kremin1
  • C. Lamman20
  • M. Landriau1
  • L. Le Guillou23
  • M. E. Levi1
  • M. Manera11,24
  • P. Martini20
  • A. Meisner8
  • R. Miquel10,11
  • J. Moustakas25
  • A. Muñoz-Gutiérrez7
  • S. Nadathur6
  • N. Palanque-Delabrouille1,19
  • W. J. Percival26,27
  • Matthew M. Pieri28
  • C. Poppett1,9
  • F. Prada29
  • I. Pérez-Ràfols30
  • G. Rossi31
  • E. Sanchez32
  • D. Schlegel1
  • H. Seo33
  • J. Silber1
  • D. Sprayberry8
  • G. Tarlé34
  • B. A. Weaver8
34 affiliations
  1. 1Lawrence Berkeley National Laboratory
  2. 2Boston University
  3. 3Università degli Studi di Milano
  4. 4INAF–Osservatorio Astronomico di Brera
  5. 5University College London
  6. 6University of Portsmouth
  7. 7Universidad Nacional Autónoma de México
  8. 8NSF NOIRLab
  9. 9University of California, Berkeley
  10. 10Institució Catalana de Recerca i Estudis Avançats
  11. 11The Barcelona Institute of Science and Technology
  12. 12Universidad de los Andes
  13. 13Institut d’Estudis Espacials de Catalunya (IEEC)
  14. 14Institute of Space Sciences
  15. 15University of Virginia
  16. 16Fermi National Accelerator Laboratory
  17. 17The University of Texas at Austin
  18. 18Institut d’Astrophysique de Paris,
  19. 19Université Paris-Saclay
  20. 20The Ohio State University
  21. 21The University of Texas at Dallas
  22. 22University of California
  23. 23Sorbonne Université
  24. 24Universitat Autònoma de Barcelona
  25. 25Siena University
  26. 26University of Waterloo
  27. 27Perimeter Institute for Theoretical Physics
  28. 28Aix Marseille Université
  29. 29Instituto de Astrofísica de Andalucía (CSIC)
  30. 30Universitat Politècnica de Catalunya
  31. 31Sejong University
  32. 32CIEMAT
  33. 33Ohio University
  34. 34University of Michigan
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Abstract

We present a measurement of baryon acoustic oscillations (BAO) in the cross correlation of triply ionized carbon (C iv ) absorption with the positions of quasars (QSO) and emission-line galaxies (ELGs). We use quasars and ELGs from the second data release (DR2) of the Dark Energy Spectroscopic Instrument survey. Our data sample consists of 2.5 million quasars, 3.1 million ELGs, and the C iv absorption is measured along the line of sight of 1.5 million high-redshift quasars with z > 1.3. We measure the isotropic BAO signal at 4.2 σ for the C IV ×QSO cross correlation. This translates into a 3.0% precision measurement of the ratio of the isotropic distance scale, D V , and the sound horizon at the drag epoch, r d , with D V / r d ( z eff = 1.92) = 30.3 ± 0.9. We make the first detection of the BAO feature in the C IV ×ELG cross-correlation at a significance of 2.5 σ and find D V / r d ( z eff = 1.47) = 24.6 ± 1.0.

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Cite

BibTeXRIS
BibTeX
@article{bault2026baryon,
  title = {{Baryon Acoustic Oscillations from the C iv Forest with DESI DR2}},
  author = {Abby Bault and Andrei Cuceu and Julien Guy and J. Aguilar and S. Ahlen and D. Bianchi and A. Brodzeller and D. Brooks and R. Canning and E. Chaussidon and T. Claybaugh and R. de Belsunce and A. de la Macorra and Arjun Dey and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and C. Gordon and D. Green and G. Gutierrez and C. Hahn and H. K. Herrera-Alcantar and K. Honscheid and M. Ishak and R. Joyce and S. Juneau and D. Kirkby and A. Kremin and C. Lamman and M. Landriau and L. Le Guillou and M. E. Levi and M. Manera and P. Martini and A. Meisner and R. Miquel and J. Moustakas and A. Muñoz-Gutiérrez and S. Nadathur and N. Palanque-Delabrouille and W. J. Percival and Matthew M. Pieri and C. Poppett and F. Prada and I. Pérez-Ràfols and G. Rossi and E. Sanchez and D. Schlegel and H. Seo and J. Silber and D. Sprayberry and G. Tarlé and B. A. Weaver},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/ae9ec1},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/ae9ec1},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Baryon Acoustic Oscillations from the C iv Forest with DESI DR2
AU  - Abby Bault
AU  - Andrei Cuceu
AU  - Julien Guy
AU  - J. Aguilar
AU  - S. Ahlen
AU  - D. Bianchi
AU  - A. Brodzeller
AU  - D. Brooks
AU  - R. Canning
AU  - E. Chaussidon
AU  - T. Claybaugh
AU  - R. de Belsunce
AU  - A. de la Macorra
AU  - Arjun Dey
AU  - P. Doel
AU  - S. Ferraro
AU  - A. Font-Ribera
AU  - J. E. Forero-Romero
AU  - E. Gaztañaga
AU  - S. Gontcho A Gontcho
AU  - C. Gordon
AU  - D. Green
AU  - G. Gutierrez
AU  - C. Hahn
AU  - H. K. Herrera-Alcantar
AU  - K. Honscheid
AU  - M. Ishak
AU  - R. Joyce
AU  - S. Juneau
AU  - D. Kirkby
AU  - A. Kremin
AU  - C. Lamman
AU  - M. Landriau
AU  - L. Le Guillou
AU  - M. E. Levi
AU  - M. Manera
AU  - P. Martini
AU  - A. Meisner
AU  - R. Miquel
AU  - J. Moustakas
AU  - A. Muñoz-Gutiérrez
AU  - S. Nadathur
AU  - N. Palanque-Delabrouille
AU  - W. J. Percival
AU  - Matthew M. Pieri
AU  - C. Poppett
AU  - F. Prada
AU  - I. Pérez-Ràfols
AU  - G. Rossi
AU  - E. Sanchez
AU  - D. Schlegel
AU  - H. Seo
AU  - J. Silber
AU  - D. Sprayberry
AU  - G. Tarlé
AU  - B. A. Weaver
PY  - 2026
DA  - 2026/10/01
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/ae9ec1
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/ae9ec1
AB  - We present a measurement of baryon acoustic oscillations (BAO) in the cross correlation of triply ionized carbon (C iv ) absorption with the positions of quasars (QSO) and emission-line galaxies (ELGs). We use quasars and ELGs from the second data release (DR2) of the Dark Energy Spectroscopic Instrument survey. Our data sample consists of 2.5 million quasars, 3.1 million ELGs, and the C iv absorption is measured along the line of sight of 1.5 million high-redshift quasars with z > 1.3. We measure the isotropic BAO signal at 4.2 σ for the C IV ×QSO cross correlation. This translates into a 3.0% precision measurement of the ratio of the isotropic distance scale, D V , and the sound horizon at the drag epoch, r d , with D V / r d ( z eff = 1.92) = 30.3 ± 0.9. We make the first detection of the BAO feature in the C IV ×ELG cross-correlation at a significance of 2.5 σ and find D V / r d ( z eff = 1.47) = 24.6 ± 1.0.
SN  - 0004-637X
SN  - 1538-4357
ER  -