DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest

Adame, A.G.; Aguilar, J.; Ahlen, S.; Alam, S.; Alexander, D.M.; Alvarez, M.; Alves, O.; Anand, A.; Andrade, U.; Armengaud, E.; Avila, S.; Aviles, A.; Awan, H.; Bailey, S.; Baltay, C.; Bault, A.; Bautista, J.; Behera, J.; Benzvi, S.; Beutler, F.; Bianchi, D.; Blake, C.; Blum, R.; Brieden, S.; Brodzeller, A.; Brooks, D.; Buckley-Geer, E.; Burtin, E.; Calderon, R.; Canning, R.; Carnero Rosell, A.; Cereskaite, R.; Cervantes-Cota, J.L.; Chabanier, S.; Chaussidon, E.; Chaves-Montero, J.; Chen, S.; Chen, X.; Claybaugh, T.; Cole, S.; Cuceu, A.; Davis, T.M.; Dawson, K.; De La Cruz, R.; De La Macorra, A.; De Mattia, A.; Deiosso, N.; Dey, A.; Dey, B.; Ding, J.; Ding, Z.; Doel, P.; Edelstein, J.; Eftekharzadeh, S.; Eisenstein, D.J.; Elliott, A.; Fagrelius, P.; Fanning, K.; Ferraro, S.; Ereza, J.; Findlay, N.; Flaugher, B.; Font-Ribera, A.; Forero-Sánchez, D.; Forero-Romero, J.E.; Garcia-Quintero, C.; Gaztañaga, E.; Gil-Marín, H.; Gontcho, S.G.A.; Gonzalez-Morales, A.X.; Gonzalez-Perez, V.; Gordon, C.; Green, D.; Gruen, D.; Gsponer, R.; Gutierrez, G.; Guy, J.; Hadzhiyska, B.; Hahn, C.; Hanif, M.M.S.; Herrera-Alcantar, H.K.; Honscheid, K.; Howlett, C.; Huterer, D.; Iršič, V.; Ishak, M.; Juneau, S.; Karaçaylı, N.G.; Kehoe, R.; Kent, S.; Kirkby, D.; Kremin, A.; Krolewski, A.; Lai, Y.; Lan, T.-.; Landriau, M.; Lang, D.; Lasker, J.; Le Goff, J.M.; Le Guillou, L.; Leauthaud, A.; Levi, M.E.; T. S., L.; Linder, E.; Lodha, K.; Magneville, C.; Manera, M.; Margala, D.; Martini, P.; Maus, M.; Mcdonald, P.; Medina-Varela, L.; Meisner, A.; Mena-Fernández, J.; Miquel, R.; Moon, J.; Moore, S.; Moustakas, J.; Mueller, E.; Muñoz-Gutiérrez, A.; Myers, A.D.; Nadathur, S.; Napolitano, L.; Neveux, R.; Newman, J.A.; Nguyen, N.M.; Nie, J.; Niz, G.; Noriega, H.E.; Padmanabhan, N.; Paillas, E.; Palanque-Delabrouille, N.; Pan, J.; Penmetsa, S.; Percival, W.J.; Pieri, M.M.; Pinon, M.; Poppett, C.; Porredon, A.; Prada, F.; Pérez-Fernández, A.; Pérez-Ràfols, I.; Rabinowitz, D.; Raichoor, A.; Ramírez-Pérez, C.; Ramirez-Solano, S.; Rashkovetskyi, M.; Ravoux, C.; Rezaie, M.; Rich, J.; Rocher, A.; Rockosi, C.; Roe, N.A.; Rosado-Marin, A.; Ross, A.J.; Rossi, G.; Ruggeri, R.; Ruhlmann-Kleider, V.; Samushia, L.; Sanchez, E.; Saulder, C.; Schlafly, E.F.; Schlegel, D.; Schubnell, M.; Seo, H.; Sharples, R.; Silber, J.; Sinigaglia, F.; Slosar, A.; Smith, A.; Sprayberry, D.; Tan, T.; Tarlé, G.; Trusov, S.; Vaisakh, R.; Valcin, D.; Valdes, F.; Vargas-Magaña, M.; Verde, L.; Walther, M.; Wang, B.; Wang, M.S.; Weaver, B.A.; Weaverdyck, N.; Wechsler, R.H.; Weinberg, D.H.; White, M.; Yu, J.; Yu, Y.; Yuan, S.; Yèche, C.; Zaborowski, E.A.; Zarrouk, P.; Zhang, H.; Zhao, C.; Zhao, R.; Zhou, R.; Zou, H.; Null, N.; Null, N.

doi:10.1088/1475-7516/2025/01/124

We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman-α (Lyα) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Lyα forest spectra and their correlation with the spatial distribution of more than 700 000 quasars. An essential facet of this work is the development of a new analysis methodology on a blinded dataset. We conducted rigorous tests using synthetic data to ensure the reliability of our methodology and findings before unblinding. Additionally, we conducted multiple data splits to assess the consistency of the results and scrutinized various analysis approaches to confirm their robustness. For a given value of the sound horizon (rd ), we measure the expansion at z eff = 2.33 with 2% precision, H(z eff) = ( 239.2 ± 4.8 ) (147.09 Mpc /rd ) km/s/Mpc. Similarly, we present a 2.4% measurement of the transverse comoving distance to the same redshift, DM (z eff) = ( 5.84 ± 0.14 ) (rd /147.09 Mpc) Gpc. Together with other DESI BAO measurements at lower redshifts, these results are used in a companion paper to constrain cosmological parameters.

DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest / A.G. Adame, J. Aguilar, S. Ahlen, S. Alam, D.M. Alexander, M. Alvarez, O. Alves, A. Anand, U. Andrade, E. Armengaud, S. Avila, A. Aviles, H. Awan, S. Bailey, C. Baltay, A. Bault, J. Bautista, J. Behera, S. Benzvi, F. Beutler, D. Bianchi, C. Blake, R. Blum, S. Brieden, A. Brodzeller, D. Brooks, E. Buckley-Geer, E. Burtin, R. Calderon, R. Canning, A. Carnero Rosell, R. Cereskaite, J.L. Cervantes-Cota, S. Chabanier, E. Chaussidon, J. Chaves-Montero, S. Chen, X. Chen, T. Claybaugh, S. Cole, A. Cuceu, T.M. Davis, K. Dawson, R. de la Cruz, A. de la Macorra, A. de Mattia, N. Deiosso, A. Dey, B. Dey, J. Ding, Z. Ding, P. Doel, J. Edelstein, S. Eftekharzadeh, D.J. Eisenstein, A. Elliott, P. Fagrelius, K. Fanning, S. Ferraro, J. Ereza, N. Findlay, B. Flaugher, A. Font-Ribera, D. Forero-Sánchez, J.E. Forero-Romero, C. Garcia-Quintero, E. Gaztañaga, H. Gil-Marín, S.G.A. Gontcho, A.X. Gonzalez-Morales, V. Gonzalez-Perez, C. Gordon, D. Green, D. Gruen, R. Gsponer, G. Gutierrez, J. Guy, B. Hadzhiyska, C. Hahn, M.M.S. Hanif, H.K. Herrera-Alcantar, K. Honscheid, C. Howlett, D. Huterer, V. Iršič, M. Ishak, S. Juneau, N.G. Karaçaylı, R. Kehoe, S. Kent, D. Kirkby, A. Kremin, A. Krolewski, Y. Lai, T.-. Lan, M. Landriau, D. Lang, J. Lasker, J.M. Le Goff, L. Le Guillou, A. Leauthaud, M.E. Levi, T.S. Li, E. Linder, K. Lodha, C. Magneville, M. Manera, D. Margala, P. Martini, M. Maus, P. Mcdonald, L. Medina-Varela, A. Meisner, J. Mena-Fernández, R. Miquel, J. Moon, S. Moore, J. Moustakas, E. Mueller, A. Muñoz-Gutiérrez, A.D. Myers, S. Nadathur, L. Napolitano, R. Neveux, J.A. Newman, N.M. Nguyen, J. Nie, G. Niz, H.E. Noriega, N. Padmanabhan, E. Paillas, N. Palanque-Delabrouille, J. Pan, S. Penmetsa, W.J. Percival, M.M. Pieri, M. Pinon, C. Poppett, A. Porredon, F. Prada, A. Pérez-Fernández, I. Pérez-Ràfols, D. Rabinowitz, A. Raichoor, C. Ramírez-Pérez, S. Ramirez-Solano, M. Rashkovetskyi, C. Ravoux, M. Rezaie, J. Rich, A. Rocher, C. Rockosi, N.A. Roe, A. Rosado-Marin, A.J. Ross, G. Rossi, R. Ruggeri, V. Ruhlmann-Kleider, L. Samushia, E. Sanchez, C. Saulder, E.F. Schlafly, D. Schlegel, M. Schubnell, H. Seo, R. Sharples, J. Silber, F. Sinigaglia, A. Slosar, A. Smith, D. Sprayberry, T. Tan, G. Tarlé, S. Trusov, R. Vaisakh, D. Valcin, F. Valdes, M. Vargas-Magaña, L. Verde, M. Walther, B. Wang, M.S. Wang, B.A. Weaver, N. Weaverdyck, R.H. Wechsler, D.H. Weinberg, M. White, J. Yu, Y. Yu, S. Yuan, C. Yèche, E.A. Zaborowski, P. Zarrouk, H. Zhang, C. Zhao, R. Zhao, R. Zhou, H. Zou, N. Null, N. Null. - In: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. - ISSN 1475-7516. - 2025:1(2025 Jan 01), pp. 124.1-124.69. [10.1088/1475-7516/2025/01/124]

DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest

Adame, A. G.;Aguilar, J.;Ahlen, S.;Alam, S.;Alexander, D. M.;Alvarez, M.;Alves, O.;Anand, A.;Andrade, U.;Armengaud, E.;Avila, S.;Aviles, A.;Awan, H.;Bailey, S.;Baltay, C.;Bault, A.;Bautista, J.;Behera, J.;BenZvi, S.;Beutler, F.;D. Bianchi;Blake, C.;Blum, R.;Brieden, S.;Brodzeller, A.;Brooks, D.;Buckley-Geer, E.;Burtin, E.;Calderon, R.;Canning, R.;Carnero Rosell, A.;Cereskaite, R.;Cervantes-Cota, J. L.;Chabanier, S.;Chaussidon, E.;Chaves-Montero, J.;Chen, S.;Chen, X.;Claybaugh, T.;Cole, S.;Cuceu, A.;Davis, T. M.;Dawson, K.;de la Cruz, R.;de la Macorra, A.;de Mattia, A.;Deiosso, N.;Dey, A.;Dey, B.;Ding, J.;Ding, Z.;Doel, P.;Edelstein, J.;Eftekharzadeh, S.;Eisenstein, D. J.;Elliott, A.;Fagrelius, P.;Fanning, K.;Ferraro, S.;Ereza, J.;Findlay, N.;Flaugher, B.;Font-Ribera, A.;Forero-Sánchez, D.;Forero-Romero, J. E.;Garcia-Quintero, C.;Gaztañaga, E.;Gil-Marín, H.;Gontcho, S. Gontcho A.;Gonzalez-Morales, A. X.;Gonzalez-Perez, V.;Gordon, C.;Green, D.;Gruen, D.;Gsponer, R.;Gutierrez, G.;Guy, J.;Hadzhiyska, B.;Hahn, C.;Hanif, M. M. S.;Herrera-Alcantar, H. K.;Honscheid, K.;Howlett, C.;Huterer, D.;Iršič, V.;Ishak, M.;Juneau, S.;Karaçaylı, N. G.;Kehoe, R.;Kent, S.;Kirkby, D.;Kremin, A.;Krolewski, A.;Lai, Y.;Lan, T. -W.;Landriau, M.;Lang, D.;Lasker, J.;Le Goff, J. M.;Le Guillou, L.;Leauthaud, A.;Levi, M. E.;Li, T. S.;Linder, E.;Lodha, K.;Magneville, C.;Manera, M.;Margala, D.;Martini, P.;Maus, M.;McDonald, P.;Medina-Varela, L.;Meisner, A.;Mena-Fernández, J.;Miquel, R.;Moon, J.;Moore, S.;Moustakas, J.;Mueller, E.;Muñoz-Gutiérrez, A.;Myers, A. D.;Nadathur, S.;Napolitano, L.;Neveux, R.;Newman, J. A.;Nguyen, N. M.;Nie, J.;Niz, G.;Noriega, H. E.;Padmanabhan, N.;Paillas, E.;Palanque-Delabrouille, N.;Pan, J.;Penmetsa, S.;Percival, W. J.;Pieri, M. M.;Pinon, M.;Poppett, C.;Porredon, A.;Prada, F.;Pérez-Fernández, A.;Pérez-Ràfols, I.;Rabinowitz, D.;Raichoor, A.;Ramírez-Pérez, C.;Ramirez-Solano, S.;Rashkovetskyi, M.;Ravoux, C.;Rezaie, M.;Rich, J.;Rocher, A.;Rockosi, C.;Roe, N. A.;Rosado-Marin, A.;Ross, A. J.;Rossi, G.;Ruggeri, R.;Ruhlmann-Kleider, V.;Samushia, L.;Sanchez, E.;Saulder, C.;Schlafly, E. F.;Schlegel, D.;Schubnell, M.;Seo, H.;Sharples, R.;Silber, J.;Sinigaglia, F.;Slosar, A.;Smith, A.;Sprayberry, D.;Tan, T.;Tarlé, G.;Trusov, S.;Vaisakh, R.;Valcin, D.;Valdes, F.;Vargas-Magaña, M.;Verde, L.;Walther, M.;Wang, B.;Wang, M. S.;Weaver, B. A.;Weaverdyck, N.;Wechsler, R. H.;Weinberg, D. H.;White, M.;Yu, J.;Yu, Y.;Yuan, S.;Yèche, C.;Zaborowski, E. A.;Zarrouk, P.;Zhang, H.;Zhao, C.;Zhao, R.;Zhou, R.;Zou, H.;null, null;null, null

2025

Abstract

We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman-α (Lyα) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Lyα forest spectra and their correlation with the spatial distribution of more than 700 000 quasars. An essential facet of this work is the development of a new analysis methodology on a blinded dataset. We conducted rigorous tests using synthetic data to ensure the reliability of our methodology and findings before unblinding. Additionally, we conducted multiple data splits to assess the consistency of the results and scrutinized various analysis approaches to confirm their robustness. For a given value of the sound horizon (rd ), we measure the expansion at z eff = 2.33 with 2% precision, H(z eff) = ( 239.2 ± 4.8 ) (147.09 Mpc /rd ) km/s/Mpc. Similarly, we present a 2.4% measurement of the transverse comoving distance to the same redshift, DM (z eff) = ( 5.84 ± 0.14 ) (rd /147.09 Mpc) Gpc. Together with other DESI BAO measurements at lower redshifts, these results are used in a companion paper to constrain cosmological parameters.

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	Parole chiave
	
				baryon acoustic oscillations; cosmological parameters from LSS; Lyman alpha forest; redshift surveys;
			
	Settori scientifico-disciplinari dell'articolo (validi dal 09/05/2024)
	
				Settore PHYS-05/A - Astrofisica, cosmologia e scienza dello spazio
			
	Data di pubblicazione
	
				1-gen-2025
			
	Rivista in ANCE
	
				JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
			
	DOI
	
				https://dx.doi.org/10.1088/1475-7516/2025/01/124
			
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				Article (author)
			
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				01 - Articolo su periodico

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