Buchumschlag

The Lyman-$α$ Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology

Fuente: arXiv

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Hauptverfasser:	Herrera-Alcantar, Hiram K., Armengaud, Eric, Yèche, Christophe, Gordon, Calum, Casas, Laura, Font-Ribera, Andreu, Magneville, Christophe, Ravoux, Corentin, Aguilar, J., Ahlen, S., Anand, A., Brooks, D., Chaussidon, E., Claybaugh, T., Cuceu, A., Dawson, K. S., de la Macorra, A., Dey, Arjun, Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gonzalez-Morales, A. X., Gutierrez, G., Guy, J., Hahn, C., Kirkby, D., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Guillou, L. Le, Manera, M., Martini, P., Meisner, A., Miquel, R., Muñoz-Gutiérrez, A., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.
Format:	Preprint
Veröffentlicht:	2025
Schlagworte:	Cosmology and Nongalactic Astrophysics
Online-Zugang:	Acceder al recurso
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_version_	1866915697570873344
author	Herrera-Alcantar, Hiram K. Armengaud, Eric Yèche, Christophe Gordon, Calum Casas, Laura Font-Ribera, Andreu Magneville, Christophe Ravoux, Corentin Aguilar, J. Ahlen, S. Anand, A. Brooks, D. Chaussidon, E. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Dey, Arjun Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Kirkby, D. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Martini, P. Meisner, A. Miquel, R. Muñoz-Gutiérrez, A. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
author_facet	Herrera-Alcantar, Hiram K. Armengaud, Eric Yèche, Christophe Gordon, Calum Casas, Laura Font-Ribera, Andreu Magneville, Christophe Ravoux, Corentin Aguilar, J. Ahlen, S. Anand, A. Brooks, D. Chaussidon, E. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Dey, Arjun Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Kirkby, D. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Martini, P. Meisner, A. Miquel, R. Muñoz-Gutiérrez, A. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
contents	The Lyman-$α$ (Ly$α$) forest is a key tracer of large-scale structure at redshifts z > 2, traditionally studied using spectra of quasars. Here, we explore the viability Lyman Break Galaxies (LBGs) as alternative background sources for Ly$α$ forest studies. We analyze 4,151 Ly$α$ forest skewers extracted from LBG spectra obtained in the DESI pilot surveys in the COSMOS and XMM-LSS fields. We present the first measurement of the Ly$α$ forest auto-correlation function derived exclusively from LBG spectra, probing comoving separations up to 48 $h^{-1}$Mpc at an effective redshift of $z_\mathrm{eff}$ = 2.70. The measured signal is consistent with that from DESI DR2 quasar Ly$α$ forest spectra at a comparable redshift, validating LBGs as reliable background sources. We also measure the cross-correlation between the LBG Ly$α$ forest and 13,362 galaxy positions, showing that this observable serves as a sensitive diagnostic for galaxy redshift uncertainties and systematic offsets. Finally, using synthetic LBG spectra and Fisher forecasts, we show that a future wide-area survey over 5000 deg$^2$, targeting 1000 LBGs per deg$^2$ at similar signal-to-noise than our dataset, could enable Ly$α$ forest baryon acoustic oscillation (BAO) measurements with 0.4% precision on the isotropic BAO scale and 1.3% on the anisotropic (Alcock-Paczynski) scale. Combining BAO with a Ly$α$ forest full-shape analysis improves the AP constraint to 0.6%. These results open a new path for precision cosmology at high redshift using dense LBG samples.
format	Preprint
id	arxiv_https___arxiv_org_abs_2507_21852
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The Lyman-$α$ Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology Herrera-Alcantar, Hiram K. Armengaud, Eric Yèche, Christophe Gordon, Calum Casas, Laura Font-Ribera, Andreu Magneville, Christophe Ravoux, Corentin Aguilar, J. Ahlen, S. Anand, A. Brooks, D. Chaussidon, E. Claybaugh, T. Cuceu, A. Dawson, K. S. de la Macorra, A. Dey, Arjun Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gonzalez-Morales, A. X. Gutierrez, G. Guy, J. Hahn, C. Kirkby, D. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Martini, P. Meisner, A. Miquel, R. Muñoz-Gutiérrez, A. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics The Lyman-$α$ (Ly$α$) forest is a key tracer of large-scale structure at redshifts z > 2, traditionally studied using spectra of quasars. Here, we explore the viability Lyman Break Galaxies (LBGs) as alternative background sources for Ly$α$ forest studies. We analyze 4,151 Ly$α$ forest skewers extracted from LBG spectra obtained in the DESI pilot surveys in the COSMOS and XMM-LSS fields. We present the first measurement of the Ly$α$ forest auto-correlation function derived exclusively from LBG spectra, probing comoving separations up to 48 $h^{-1}$Mpc at an effective redshift of $z_\mathrm{eff}$ = 2.70. The measured signal is consistent with that from DESI DR2 quasar Ly$α$ forest spectra at a comparable redshift, validating LBGs as reliable background sources. We also measure the cross-correlation between the LBG Ly$α$ forest and 13,362 galaxy positions, showing that this observable serves as a sensitive diagnostic for galaxy redshift uncertainties and systematic offsets. Finally, using synthetic LBG spectra and Fisher forecasts, we show that a future wide-area survey over 5000 deg$^2$, targeting 1000 LBGs per deg$^2$ at similar signal-to-noise than our dataset, could enable Ly$α$ forest baryon acoustic oscillation (BAO) measurements with 0.4% precision on the isotropic BAO scale and 1.3% on the anisotropic (Alcock-Paczynski) scale. Combining BAO with a Ly$α$ forest full-shape analysis improves the AP constraint to 0.6%. These results open a new path for precision cosmology at high redshift using dense LBG samples.
title	The Lyman-$α$ Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2507.21852