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Selection of high-redshift Lyman-Break Galaxies from broadband and wide photometric surveys

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Auteurs principaux:	Payerne, C., Doumerg, W. d'Assignies, Yèche, C., Ruhlmann-Kleider, V., Raichoor, A., Lang, D., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cole, S., de la Macorra, A., Dey, A., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S. Gontcho A, Gutierrez, G., Gwyn, S., Honscheid, K., Juneau, S., Lambert, A., Landriau, M., Guillou, L. Le, Levi, M. E., Magneville, C., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Newman, J. A., Palanque-Delabrouille, N., Percival, W., Picouet, V., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Sawicki, M., Schlegel, D., Schubnell, M., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.
Format:	Preprint
Publié:	2024
Sujets:	Cosmology and Nongalactic Astrophysics
Accès en ligne:	Acceder al recurso
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author	Payerne, C. Doumerg, W. d'Assignies Yèche, C. Ruhlmann-Kleider, V. Raichoor, A. Lang, D. Aguilar, J. N. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. de la Macorra, A. Dey, A. Dey, B. Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Gwyn, S. Honscheid, K. Juneau, S. Lambert, A. Landriau, M. Guillou, L. Le Levi, M. E. Magneville, C. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Newman, J. A. Palanque-Delabrouille, N. Percival, W. Picouet, V. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Sawicki, M. Schlegel, D. Schubnell, M. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
author_facet	Payerne, C. Doumerg, W. d'Assignies Yèche, C. Ruhlmann-Kleider, V. Raichoor, A. Lang, D. Aguilar, J. N. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. de la Macorra, A. Dey, A. Dey, B. Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Gwyn, S. Honscheid, K. Juneau, S. Lambert, A. Landriau, M. Guillou, L. Le Levi, M. E. Magneville, C. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Newman, J. A. Palanque-Delabrouille, N. Percival, W. Picouet, V. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Sawicki, M. Schlegel, D. Schubnell, M. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
contents	In this paper, we investigate the possibility of selecting high-redshift Lyman-Break Galaxies (LBG) using current and future broadband wide photometric surveys, such as UNIONS or the Vera C. Rubin LSST. This work is conducted in the context of DESI-II, the next phase of DESI, which will start around 2029. We use deep imaging data from HSC and CLAUDS on the COSMOS and XMM-LSS fields. To predict the selection performance of LBGs with image quality similar to UNIONS, we degrade the $u, g, r, i$ and $z$ bands to UNIONS depth. The Random Forest algorithm is trained with the $u,g,r,i$ and $z$ bands to classify LBGs in the $2.5 < z < 3.5$ range. We find that fixing a target density budget of $1,100$ deg$^{-2}$, the Random Forest approach gives a density of $z>2$ targets of $873$ deg$^{-2}$, and a density of $493$ deg$^{-2}$ of confirmed LBGs after spectroscopic confirmation with DESI. This UNIONS-like selection was tested in a dedicated spectroscopic observation campaign of 1,000 targets with DESI on the COSMOS field, providing a safe spectroscopic sample with a mean redshift of 3. This sample is used to derive forecasts for DESI-II, assuming a sky coverage of 5,000 deg$^2$. We predict uncertainties on Alcock-Paczynski parameters $α_\perp$ and $α_{\parallel}$ to be 0.7$\%$ and 1$\%$ for $2.6<z<3.2$, resulting in a potential 2$\%$ measurement of the dark energy fraction at high redshift. Additionally, we estimate the uncertainty in local non-Gaussianity and predict $σ_{f_{\rm NL}}\approx 7$, which would be comparable to the current best precision achieved by \textit{Planck}. The latter forecast suggests that achieving the precision required to place stringent constraints on inflationary models ($σ_{f_{\rm NL}} \approx 1$) using spectroscopic galaxy surveys necessitates the development of a next-generation (Stage V) spectroscopic survey.
format	Preprint
id	arxiv_https___arxiv_org_abs_2410_08062
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Selection of high-redshift Lyman-Break Galaxies from broadband and wide photometric surveys Payerne, C. Doumerg, W. d'Assignies Yèche, C. Ruhlmann-Kleider, V. Raichoor, A. Lang, D. Aguilar, J. N. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. Cole, S. de la Macorra, A. Dey, A. Dey, B. Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Gwyn, S. Honscheid, K. Juneau, S. Lambert, A. Landriau, M. Guillou, L. Le Levi, M. E. Magneville, C. Manera, M. Meisner, A. Miquel, R. Moustakas, J. Newman, J. A. Palanque-Delabrouille, N. Percival, W. Picouet, V. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Sawicki, M. Schlegel, D. Schubnell, M. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H. Cosmology and Nongalactic Astrophysics In this paper, we investigate the possibility of selecting high-redshift Lyman-Break Galaxies (LBG) using current and future broadband wide photometric surveys, such as UNIONS or the Vera C. Rubin LSST. This work is conducted in the context of DESI-II, the next phase of DESI, which will start around 2029. We use deep imaging data from HSC and CLAUDS on the COSMOS and XMM-LSS fields. To predict the selection performance of LBGs with image quality similar to UNIONS, we degrade the $u, g, r, i$ and $z$ bands to UNIONS depth. The Random Forest algorithm is trained with the $u,g,r,i$ and $z$ bands to classify LBGs in the $2.5 < z < 3.5$ range. We find that fixing a target density budget of $1,100$ deg$^{-2}$, the Random Forest approach gives a density of $z>2$ targets of $873$ deg$^{-2}$, and a density of $493$ deg$^{-2}$ of confirmed LBGs after spectroscopic confirmation with DESI. This UNIONS-like selection was tested in a dedicated spectroscopic observation campaign of 1,000 targets with DESI on the COSMOS field, providing a safe spectroscopic sample with a mean redshift of 3. This sample is used to derive forecasts for DESI-II, assuming a sky coverage of 5,000 deg$^2$. We predict uncertainties on Alcock-Paczynski parameters $α_\perp$ and $α_{\parallel}$ to be 0.7$\%$ and 1$\%$ for $2.6<z<3.2$, resulting in a potential 2$\%$ measurement of the dark energy fraction at high redshift. Additionally, we estimate the uncertainty in local non-Gaussianity and predict $σ_{f_{\rm NL}}\approx 7$, which would be comparable to the current best precision achieved by \textit{Planck}. The latter forecast suggests that achieving the precision required to place stringent constraints on inflationary models ($σ_{f_{\rm NL}} \approx 1$) using spectroscopic galaxy surveys necessitates the development of a next-generation (Stage V) spectroscopic survey.
title	Selection of high-redshift Lyman-Break Galaxies from broadband and wide photometric surveys
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2410.08062