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The effects of continuum fitting on Lyman-$α$ forest correlations

Fuente: arXiv

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Bibliographic Details
Main Authors:	Busca, Nicolas, Rich, James, Bautista, Julian, Cuceu, Andrei, Font-Ribera, Andreu, Guy, Julien, Herrera-Alcantar, Hiram K., Stermer, Julianna, Balland, Christophe, Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., de la Macorra, A., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gordon, C., Gutierrez, G., Ishak, M., Kehoe, R., Kirkby, D., Kremin, A., Landriau, M., Guillou, L. Le, Magneville, C., Martini, P., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Prada, F., Pérez-Ràfols, I., Ravoux, C., Rossi, G., Sanchez, E., Schlegel, D., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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_version_	1866915562583490560
author	Busca, Nicolas Rich, James Bautista, Julian Cuceu, Andrei Font-Ribera, Andreu Guy, Julien Herrera-Alcantar, Hiram K. Stermer, Julianna Balland, Christophe Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gordon, C. Gutierrez, G. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Magneville, C. Martini, P. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
author_facet	Busca, Nicolas Rich, James Bautista, Julian Cuceu, Andrei Font-Ribera, Andreu Guy, Julien Herrera-Alcantar, Hiram K. Stermer, Julianna Balland, Christophe Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gordon, C. Gutierrez, G. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Magneville, C. Martini, P. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
contents	Correlations of fluctuations of the flux in Lyman-$α$ forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they have revealed the effects of baryon acoustic oscillations (BAO). In order to fit the correlation functions to a physical model and thereby constrain cosmological parameters, it is necessary to take into account the effects of fitting the observed spectra to a template about which the fluctuations are measured. In this paper we use mock spectra to test the distortion matrix technique that has been used since the final BOSS data release to appropriately distort the models. We show that while percent-level effects on the derived forest bias parameters may be present, the technique works sufficiently well that the determination of the BAO peak position is not affected at the percent level. We introduce modifications in the technique used by DESI that were not in the original applications and suggest further possibilities for improvements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2506_15262
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	The effects of continuum fitting on Lyman-$α$ forest correlations Busca, Nicolas Rich, James Bautista, Julian Cuceu, Andrei Font-Ribera, Andreu Guy, Julien Herrera-Alcantar, Hiram K. Stermer, Julianna Balland, Christophe Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gordon, C. Gutierrez, G. Ishak, M. Kehoe, R. Kirkby, D. Kremin, A. Landriau, M. Guillou, L. Le Magneville, C. Martini, P. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Prada, F. Pérez-Ràfols, I. Ravoux, C. Rossi, G. Sanchez, E. Schlegel, D. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics Correlations of fluctuations of the flux in Lyman-$α$ forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they have revealed the effects of baryon acoustic oscillations (BAO). In order to fit the correlation functions to a physical model and thereby constrain cosmological parameters, it is necessary to take into account the effects of fitting the observed spectra to a template about which the fluctuations are measured. In this paper we use mock spectra to test the distortion matrix technique that has been used since the final BOSS data release to appropriately distort the models. We show that while percent-level effects on the derived forest bias parameters may be present, the technique works sufficiently well that the determination of the BAO peak position is not affected at the percent level. We introduce modifications in the technique used by DESI that were not in the original applications and suggest further possibilities for improvements.
title	The effects of continuum fitting on Lyman-$α$ forest correlations
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2506.15262