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DESI DR2 Results I: Baryon Acoustic Oscillations from the Lyman Alpha Forest

Journal Article · · Phys.Rev.D
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  1. IRFU, Saclay
  2. LBL, Berkeley
  3. Boston U.
  4. Laguna U., Tenerife; IAC, La Laguna
  5. U. Michigan, Ann Arbor
  6. Michigan U., MCTP; U. Michigan, Ann Arbor
  7. UNAM, CCF; Mexico U., ICN
  8. Rochester U.
  9. Milan U.; Brera Observ.
  10. Swinburne U., Ctr. Astrophys. Supercomput.
  11. University Coll. London
  12. Chicago U., Astron. Astrophys. Ctr.; Fermilab
  13. Prague, Inst. Phys.
  14. Portsmouth U., ICG
  15. Edinburgh U., Inst. Astron.
  16. Barcelona, IFAE
  17. Barcelona, IEEC; ICE, Bellaterra
  18. Sussex U.
  19. Ohio State U.
  20. Durham U., ICC
  21. Taiwan, Natl. Tsing Hua U.
  22. LBL, Berkeley; NASA, Goddard
  23. Utah U.
  24. UNAM, Mexico
  25. Madrid, CIEMAT
  26. San Diego State U.; Natl. Solar Observ., Tucson
  27. Natl. Solar Observ., Tucson
  28. Toronto U., Astron. Dept.; Pittsburgh U.
  29. Beijing, GUCAS
  30. UC, Berkeley (main); UC, Berkeley, Math. Dept.
  31. Harvard-Smithsonian Ctr. Astrophys.
  32. KIPAC, Menlo Park; SLAC
  33. LBL, Berkeley; UC, Berkeley, Math. Dept.
  34. Andes U., Bogota
  35. Harvard-Smithsonian Ctr. Astrophys.; NASA, Goddard
  36. Flatiron Inst., New York; Fermilab
  37. Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra
  38. ICC, Barcelona U.; U. Barcelona (main); Barcelona, IEEC
  39. Guanajuato U.
  40. UC, Irvine
  41. Fermilab
  42. Clemson U.; LSST, Tucson; Arizona U., Astron. Dept. - Steward Observ.
  43. Paris, Inst. Astrophys.; IRFU, Saclay
  44. Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.
  45. Chicago U., KICP; Ohio State U.
  46. Queensland U.
  47. Michigan U.
  48. U. Texas, Dallas
  49. Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.
  50. Southern Methodist U.
  51. Edinburgh U., Inst. Astron.; Cambridge U., Inst. of Astron.
  52. Perimeter Inst. Theor. Phys.
  53. New York U., Courant Inst.
  54. LPNHE, Paris
  55. Lick Observ.; UC, Santa Cruz (main); UC, Santa Cruz, Inst. Part. Phys.
  56. Toronto U., Astron. Dept.
  57. KASI, DaeJeon; Taejon, Elect. Telecomm. Res. Inst.
  58. Barcelona, IFAE; Barcelona, Autonoma U.
  59. KASI, DaeJeon
  60. LPSC, Grenoble
  61. ICREA, Barcelona; Barcelona, IFAE
  62. Siena Coll., Loudonville
  63. Marseille, Lab. Astrophys.
  64. Wyoming U.
  65. Pittsburgh U.
  66. Guanajuato U.; Mexico U., ICN
  67. UNAM, CCF; UNAM, Mexico
  68. Waterloo U.; Clemson U.; LSST, Tucson
  69. IRFU, Saclay; LBL, Berkeley
  70. Waterloo U.; Perimeter Inst. Theor. Phys.
  71. Barcelona, Polytechnic U.
  72. LBL, Berkeley; UC, Berkeley (main); UC, Berkeley, Math. Dept.
  73. Granada U., Theor. Phys. Astrophys.
  74. Yale U.
  75. LPC, Clermont-Ferrand
  76. IRFU, Saclay; LPNHE, Paris
  77. Lick Observ.; UC, Santa Cruz (main); UC, Santa Cruz, Inst. Part. Phys.; UC, Santa Cruz
  78. Sejong U.
  79. Ohio U., Athens
  80. Durham U.; Durham U., ICC
  81. Munich, Tech. U., Universe; Munich U.
  82. Beijing Observ.
+ Show Author Affiliations
We present the Baryon Acoustic Oscillation (BAO) measurements with the Lyman-alpha (LyA) forest from the second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI) survey. Our BAO measurements include both the auto-correlation of the LyA forest absorption observed in the spectra of high-redshift quasars and the cross-correlation of the absorption with the quasar positions. The total sample size is approximately a factor of two larger than the DR1 dataset, with forest measurements in over 820,000 quasar spectra and the positions of over 1.2 million quasars. We describe several significant improvements to our analysis in this paper, and two supporting papers describe improvements to the synthetic datasets that we use for validation and how we identify damped LyA absorbers. Our main result is that we have measured the BAO scale with a statistical precision of 1.1% along and 1.3% transverse to the line of sight, for a combined precision of 0.65% on the isotropic BAO scale at $$z_{eff} = 2.33$$. This excellent precision, combined with recent theoretical studies of the BAO shift due to nonlinear growth, motivated us to include a systematic error term in LyA BAO analysis for the first time. We measure the ratios $$D_H(z_{eff})/r_d = 8.632 \pm 0.098 \pm 0.026$$ and $$D_M(z_{eff})/r_d = 38.99 \pm 0.52 \pm 0.12$$, where $$D_H = c/H(z)$$ is the Hubble distance, $$D_M$$ is the transverse comoving distance, $$r_d$$ is the sound horizon at the drag epoch, and we quote both the statistical and the theoretical systematic uncertainty. The companion paper presents the BAO measurements at lower redshifts from the same dataset and the cosmological interpretation.
Research Organization:
Andes U., Bogota; Arizona U., Astron. Dept. - Steward Observ.; Barcelona, Autonoma U.; Barcelona, IEEC; Barcelona, IFAE; Barcelona, Polytechnic U.; Beijing Observ.; Beijing, GUCAS; Boston U.; Brera Observ.; Cambridge U., Inst. of Astron.; Chicago U., Astron. Astrophys. Ctr.; Chicago U., KICP; Clemson U.; Durham U.; Durham U., ICC; Edinburgh U., Inst. Astron.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Flatiron Inst., New York; Granada U., Theor. Phys. Astrophys.; Guanajuato U.; Harvard-Smithsonian Ctr. Astrophys.; Hiroshima Shudo U.; IAC, La Laguna; ICC, Barcelona U.; ICE, Bellaterra; ICREA, Barcelona; IRFU, Saclay; KASI, DaeJeon; KEK, Tsukuba; LPC, Clermont-Ferrand; LPNHE, Paris; LPSC, Grenoble; LSST, Tucson; Laguna U., Tenerife; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lick Observ.; Madrid, CIEMAT; Marseille, Lab. Astrophys.; Mexico U., ICN; Michigan U.; Michigan U., MCTP; Milan U.; Munich U.; Munich, Tech. U., Universe; NASA, Goddard; Natl. Solar Observ., Tucson; New York U., Courant Inst.; Ohio State U.; Ohio State U., Dept. Astron.; Ohio U., Athens; Paris, Inst. Astrophys.; Perimeter Inst. Theor. Phys.; Pittsburgh U.; Portsmouth U., ICG; Prague, Inst. Phys.; Queensland U.; Rochester U.; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); San Diego State U.; Sejong U.; Siena Coll., Loudonville; Southern Methodist U.; Sussex U.; Swinburne U., Ctr. Astrophys. Supercomput.; Taejon, Elect. Telecomm. Res. Inst.; Taiwan, Natl. Tsing Hua U.; Toronto U., Astron. Dept.; U. Barcelona (main); U. Michigan, Ann Arbor; U. Texas, Dallas; UC, Berkeley (main); UC, Berkeley, Math. Dept.; UC, Irvine; UC, Santa Cruz; UC, Santa Cruz (main); UC, Santa Cruz, Inst. Part. Phys.; UNAM, CCF; UNAM, Mexico; University Coll. London; Utah U.; Waterloo U.; Wyoming U.; Yale U.
Sponsoring Organization:
US Department of Energy
Grant/Contract Number:
89243024CSC000002
OSTI ID:
2550646
Report Number(s):
FERMILAB-PUB-25-0167-PPD; arXiv:2503.14739; oai:inspirehep.net:2902356
Journal Information:
Phys.Rev.D, Journal Name: Phys.Rev.D
Country of Publication:
United States
Language:
English

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